Mandarin garnet

Like fiery comets against the evening sky, the first mandarin garnets appeared in the gemstone trade a little over ten years ago. Specialists and gemstone lovers all agreed: the magnificent colours and high brilliance of these orange-red treasures are unique. So what kind of gemstones are they, and where do they come from?

Close your eyes and dream a little: Africa. In the north-west of Namibia, the evening sky glows orange-red over quiet hills and a solitary river. The next settlement is some nine hours away by car. Temperatures here are extreme: in summertime they rise to between 40 and 50 degrees Celsius, and in winter they drop almost to freezing-point. Here, far away from civilisation of any kind, the Kunene River has been winding its way through the hills along the border between Namibia and Angola for centuries. At this remote spot, one of the last untouched places on Earth, the first mandarin garnets were discovered in 1991. Embedded in mica and mica schist where they had come into being millions of years before, small crystals of an unusual coour and transparency were discovered, and they immediately attracted the attention of the specialists. The gemmological examination proceeded to confirm initial suppositions: it was a find involving the rare orange gemstone variety known as 'spessartine' from the large, colourful garnet family. Until then, spessartines had been found in Sri Lanka, Upper Burma, Madagascar, Brazil, Australia, Kenya and Tanzania, and yet they were practically unknown in jewellery, catering mainly to the interests of gemstone lovers and collectors. The reason for this rather shadowy existence was a simple one: specimens with really good colour and quality were only found very rarely indeed. The fantastic crystals from Namibia, on the other hand, were of an unusually fine, intensely radiant orange. Some sparkled in the rich reddish-orange of the last light of evening, seen when the sun has already disappeared below the horizon. They were more beautiful and more radiant than anything that had gone before them. And hardly any inclusions interfered with the brilliant image of these 'noble garnets'.

Swiftly, the raw crystals found their way on to the market via a few gemstone cutting-centres. Most of them were faceted, this being the best way to bring out their incomparable colour and brilliance. But sadly, the mine on the Kunene River was exhausted after a short while. At the beginning, the gemstones had been found there at the very surface, but gradually they had had to dig deeper and deeper, the yield becoming smaller and smaller and the costs higher and higher. Finally, production was ceased. Further searches in the remote bush country of Namibia would have required too much effort and proved too expensive. Traders and gemstone lovers greatly regretted the fact that this, of all gemstones, which had gained such an enthusiastic following so quickly, was now only available occasionally from the stocks of a few cutting-centres.

A real rocket

Within a very short time, this beautiful gemstone had shot up into the firmament of the international jewellery scene like a rocket. As to the name, there had been a certain amount of wrangling among gemmologists and gemstone dealers. Some called the brilliant orange to orange-red beauties 'Kunene spessartines', after the place where they had been found, whilst others spoke of 'hollandines'. But fairly quickly, the illustrative name 'mandarin garnet' began to prevail in international trade. That was the name by which the fiery orange gemstone was known when it began its conquest of the world. It was a fitting name, and it is the one which has remained to this day. Fortunately, that unique find on the Kunene River was not the only one of its kind. In about April 1994, more orange spessartines appeared in the trade, this time from Nigeria. As far as their colour and their brilliance went they were very similar to the mandarin garnets from Namibia, even if the experienced specialist was able to discern some subtle differences. They were found right down in the south-west corner of Nigeria, not far from neighbouring Benin. The mine is in a river-bed in the bush. During the rainy season it is necessary to pump the water out of the pits. Garnet specialist Thomas Lind of Idar-Oberstein was thrilled by the attractiveness of the new find: "There are some beautiful, radiant orange mandarin garnets from Nigeria in the trade, and among them there are, again and again, stones in sizes of over 1 carat. I am glad to say that they enhance what is being offered in the trade, and that the supply of this gemstone, which was once so rare, has stabilised in the meantime." Now, mandarin garnets are once again available in reliable quantities, even if top-quality stones are extremely rare.

Orange symbolises joie de vivre and individuality

So what makes the mandarin garnet so special? First, of course, there is its colour, that radiant orange, sometimes with slight brown undertones, in the whole range of hues from ripe peach to deep reddish-orange. Colours which speak of energy and joie de vivre, individuality and a readiness to take risks. A person who displays orange is not afraid of being noticed; showing this colour indicates confidence. Unmistakably, it is a colour shown by extroverts. But orange is more than that: for example, it plays a much more important role in Asian art than in European. There, the gods are often clothed in orange robes, and even the sky can be orange. Yellow and red, the colours from which orange is made, are not opposites in Asia, but are instead related. The robes of Buddhist monks are also orange, and they are made from a single piece of material. Orange stands for the process of all life. All being is perceived as the constant interplay between the active male principle Yang and the passive female Yin. These are not opposites, but transform and interweave incessantly. Life means change - and orange symbolises that constant change like no other colour.

However, apart from its magnificent colour, the mandarin garnet has other good qualities which make it a truly unique gemstone. For example its good hardness. It is an uncomplicated gemstone and an ideal chaperone for all occasions. And then it has a very high refractive index, which gives it unusually strong brilliance. Even in unfavourable light conditions, small, brilliant-cut, inclusion-free mandarin garnets still sparkle with great vivacity. And then of course there is its rarity. No-one can say how long there will be as reliable a supply of this gemstone in the trade as there is at present. So colour, luminosity, hardness and rarity combine to make this gemstone, beautiful but at the same time easy to look after, something really special. Individualists with a well developed sense of style can only say "That's the stone for me!" when they set eyes on it.

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Demantoid

The demantoid is one of the most brilliant gemstones that exist, yet until recently it was little known except among collectors and gemstone lovers. Strictly speaking it is a green garnet, or rather the star of the green garnets. Not without reason does it bear a name which means 'diamond-like'. The name comes from the Dutch and makes reference to the outstanding quality of this gem, its incomparable brilliance and fire. Some gemstone lovers claim that a demantoid will continue to glow even in the shade.

The demantoid belongs to the large gemstone family of the garnets, and is actually a variety of the garnet mineral andradite. But it is more than that: it is the most expensive kind of garnet and one of the most precious of all gemstones. It is highly esteemed on account of its rarity coupled with that incredible luminosity. For the latter, at least, there is a plausible explanation: the demantoid has an extremely high refraction (refractive index 1.880 to 1.889). Yet its high dispersion is also remarkable, in other words its ability to split the light which comes in through the facets and break it down into all the colours of the rainbow. The demantoid is a master of this, and does it even better than the diamond.

The spectrum of its colours includes many shades of green, from a slightly yellowish green to a brownish green with a golden glow. Particularly precious is a deep emerald green, though this only occurs very rarely indeed. It is not only fine and unusual, but the specimens are also mostly small, large ones being extremely rare. Once cut, only a few stones weigh more than two carats, and most of them hardly exceed one. And even if you come across one set in a piece of jewellery, it is always likely to be a small stone.

Favourite stone of Russia's star jeweller

There have been a good many beautiful gems which appeared like shooting-stars in the fascinating world of gemstones and vanished from the scene again after only a short time. That indeed is probably what would have happened to the demantoid ... if a goatherd had not happened to be going about his business one day in Namibia. But more of that in a moment. After its discovery in 1868 in Russia's Ural mountains, the demantoid rapidly proceeded to become a much desired gemstone. Comet-like, it scintillated among the finest jeweller's workshops in Paris, New York and St. Petersburg. First and foremost, Russia's star jeweller Carl Fabergé adored it for its tremendous brilliance and loved to incorporate it in his precious objects. But with the chaos of the First World War, the green star began to fade rapidly. Now, it made only rare appearances in the gemstone trade, and when it did so it was mostly incorporated in an item of second-hand jewellery, or among remnant stocks from the places where it had originally been found in the Urals. Occasionally demantoids were found in other parts of the world, for example in the Congo, or in Korea in 1975, but the quality of these stones was such that they were suitable for collectors' use only.

The situation changed quite suddenly in the middle of the 1990s, when a new seam bearing gemstones was discovered in Namibia. Demantoid was among them.

The story of that discovery reads like a thriller. It is set in the southern Damara country near the Spitzkoppe, as the 'Matterhorn of Africa' is also known. The vast, steppe-like country surrenders to the scorching African sun. Far away on the horizon, the 'black mountains' lie blurred in the bluish haze. It's a dry, hard country. Yet for a long, long time it had held an unknown treasure: gemstones! Millions of years before, liquid magma had shot up from the bowels of the Earth and solidified shortly before it reached the surface. In the course of time, the wind and the elements removed the surface strata until finally only the distinctive granite mountain, the Spitzkoppe, was left. And the gemstones, that is. No-one had an inkling of their existence until in December 1996, quite by chance, a wandering goatherd found a number of crystal-like objects which seemed to him worthy of attention. When he had shown them around a bit in a nearby village, the attention of experts was drawn to the find, and they quickly realised what a treasure was being presented to them.

Meanwhile, the Namibian government has issued concessions for gemstone mines. The rare gemstones are carefully quarried by hand from the parent rock. Care is taken to ensure that as little as possible of the precious raw material is lost.

Why the horsetail influences the value of a demantoid

Demantoids from Namibia come in shades from a vivacious light green to an intense blue-green. They have a striking brilliance. Thanks to their hardness of just under 7 on the Mohs scale, they are well suited to being used in jewellery. However, they do lack one feature by which the true demantoid had always been able to be identified through the microscope: 'horsetail inclusions'. These golden brown crystal threads of chrysotile, mostly appearing to radiate out from the centre of the stone, had previously occurred in almost all demantoids. But - more's the pity - they were missing in the relatively inclusion-free gems from Namibia. These horsetail inclusions were not only typical of the demantoid; they could even increase its value if they were pronounced. That may sound surprising, since as a rule inclusions, which can impair the transparency of a gemstone, are not a welcome sight. But with the demantoid's 'horsetail inclusions' it is a different matter. A beautiful, well formed inclusion can increase the value of the gemstone considerably, a good many collectors being prepared to pay a higher price.

If you are offered a demantoid, it is definitely a good idea to have a look at it through the gemstone microscope. If the stone comes from Russia, you may be able to see these fine, fibrous wisps whose resemblance to the tail of a horse is unmistakable. If that is the case, you have a definite pointer to its origin. At the same time, this 'fingerprint of Nature' shows you that you are holding one of the rarest and most valuable gemstones in your hand. This rarity will also make itself felt in the price, since a demantoid from Russia will be valued much more highly than a green garnet from Namibia, however brilliant the latter may be.

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Tsavorite

The shining green tsavorite is a young gemstone with a very long geological history. Its home is the East-African bushland along the border between Kenya and Tanzania. The few mines lie in a uniquely beautiful landscape of arid grassland with bare, dry hills. It's dangerous country, the habitat of snakes, and now and then a lion patrols, on the lookout for prey. There, near the world-famous Tsavo National Park, that history began.

In 1967 a British geologist by the name of Campbell R. Bridges was looking for gemstones in the mountains in the north-east of Tanzania. Suddenly he came across some strange, potato-like nodules of rock. It was like a fairy-tale: inside these strange objects he found some beautiful green grains and crystal fragments. A gemmological examination revealed that what he had discovered was green grossularite, a mineral belonging to the colourful gemstone group of the garnets, and one which had only been found on rare occasions until then. It was of an extraordinarily beautiful colour and good transparency. The find made the specialists sit up and take notice; Tiffany & Co. in New York also soon showed an interest in the newly discovered green jewel.

However, in spite of all efforts, it was not, at the time, possible to export the stones from Tanzania. But Campbell Bridges was not one to give up easily. As a geologist, he knew that earth strata bearing gemstones were not necessarily limited to one particular area, indeed that they could extend over much greater areas - and in his opinion the stratum he had found was just such a one. For the rock belt in which most of East Africa's gemstone mines lie is very ancient. It began to form many millions of years ago, while the continents were still very much on the move. At that time, the area concerned had actually been under the sea. The sedimental deposits between the continents were greatly compressed and folded as a result of the movement of the massifs. Through tremendous pressure and at high temperatures, the rocks which had been present originally were transformed. New, exciting, beautiful gemstones came into being - among them the tsavorite. Having said that, the tremendous forces of Nature damaged most of the crystals so badly at the time of their formation that today it is usually only grains or fragments which are found.

Campbell B. Bridges persevered. His surmise that the seam bearing the gemstones might possibly continue into Kenya finally put him on the right track. In 1971, he discovered the brilliant green gemstone for the second time, in Kenya. There, he was able to have the find registered officially and begin with the exploitation of the deposit. It was an adventurous business. To protect himself from wild animals, Bridges began by living in a tree-house. In order not to have any of the gemstones stolen, he set a python to watch over them, making use of the fact that his workers were afraid of snakes. It was a wonderful find. Unfortunately, the gemstone had been known only to specialists up to that point in time, but that changed quickly in 1974, when the Tiffany company began a broad promotion campaign which soon made the tsavorite well known in the USA. Further promotion campaigns followed in other countries, and soon the tsavorite was also known at international level.

Green like a garnet ...

So why is the stone called a tsavorite or tsavolite when it is actually a green grossularite and comes from the colourful gemstone family of the Garnet? The nomenclature of gemstones follows certain rules. According to modern mineralogical methods, gemstones are given a name which ends in 'ite'. In honour of the Tsavo National Park, with its abundance of game, and the Tsavo River which flows through it, the former president of Tiffany & Co. Henry Platt, who had followed the developments of the gemstone from the very beginning, proposed the name 'tsavorite'. Sometimes the term 'tsavolite' is used. However, both names denote the same stone, the latter version simply having the Greek suffix '-lite' (stone).

What is it that makes the tsavorite so desirable? Well, for one thing there is its vivid, radiant green. The colour range of the tsavorite includes a springlike light green, an intense blue-green and a deep forest green - colours which have a refreshing and invigorating effect on the senses. However, this gemstone is also valuable on account of its great brilliance. It has, like all the other garnets, a particularly high refractive index (1.734/44). Not without reason did they use to say in the old legends that a garnet was a difficult thing to hide. Its sparkling light was said to remain visible even through clothing.

Unlike many other gemstones, the tsavorite is neither burnt nor oiled. This gemstone is not in need of any such treatment. Like all the other garnets it is simply a piece of pure, unadulterated Nature. Another positive characteristic is its robustness. It has almost the same hardness as the (considerably more expensive) emerald, - approximately 7.5 on the Mohs scale - but it is markedly less sensitive. That is an important feature not only when it comes to the stone's being set but also in its being worn. A tsavorite is not so likely to crack or splinter as a result of an incautious movement. It is well suited to the popular 'invisible setting', in which the stones are set close by one another, a technique which ought not to be used with the more sensitive emerald. Thanks to its great brilliance, the tsavorite is, in this respect, a partner to match the classics: diamond, ruby and sapphire.

Only in rare individual cases is a raw crystal of over 5 carats found, so a cut tsavorite of more than two carats is a rare and precious thing. But then that is one of the special features of this gemstone: that it can display its great luminosity even in small sizes.

There's something very special about this young gemstone with the very long history. With its fresh, vivid green, its good wearing qualities, great brilliance and relatively reasonable prices, it is surely one of the most convincing and honest gemstones that exist.

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Garnet

Aren't garnets those wonderful deep-red gemstones you often find in antique jewellery? Well yes, to a certain extent, a deep, warm red indeed being the colour most frequently found in garnets. Sadly, however, far too few people are aware that the world of the garnets is far more colourful than that. Spectacular finds, especially in Africa, have enhanced the traditional image of the garnet with a surprising number of hues - even if red does continue to be its principal colour. Thanks to their rich colour spectrum, garnets today can quite happily keep pace with changes of style and the colour trends of fashion. And thanks to the new finds, there is a reliable supply of them too. So in fact this gemstone group in particular is one which gives new impetus to the world of jewellery today.

By the term 'garnet', the specialist understands a group of more than ten different gemstones of similar chemical composition. It is true to say that red is the colour most often encountered, but the garnet also exists in various shades of green, a tender to intense yellow, a fiery orange and some fine earth-coloured nuances. The only colour it cannot offer is blue. Garnets are much sought-after and much worked gemstones - the more so because today it is not only the classical gemstone colours red and green which are so highly esteemed, but also the fine hues in between. Furthermore, the world of the garnets is also rich in rarities such as star garnets and stones whose colour changes depending on whether they are seen in daylight or artificial light.

And what else is there that distinguishes this gemstone group from the others? Well, first of all there is its good hardness of 7 to 7.5 on the Mohs scale. With a few minor exceptions it applies to all the members of the garnet group, and it is the reason for the excellent wearing qualities of these gemstones. Garnets are relatively insensitive and uncomplicated to work with. The only thing they really don't like is being knocked about or subjected to improper heat treatment. A further plus is their high refractive index, the cause of the garnet's great brilliance. The shape of the raw crystals is also interesting. Garnet means something like 'the grainy one', coming from the Latin 'granum', for grain. This makes reference not only to the typical roundish shape of the crystals, but also to the colour of the red garnet, which often puts one in mind of the seeds of a ripe pomegranate. In the Middle Ages, the red garnet was also called the 'carbuncle stone'. And even today, fantasy names like Arizona ruby, Arizona spinel, Montana ruby or New Mexico ruby are still rife in the trade.

The warm red of the garnet illuminated Noah's Ark

Garnets have been known to Man for thousands of years. Noah, it is said, used a garnet lantern to help him steer his ark through the dark night. Garnets are also found in jewellery from early Egyptian, Greek and Roman times. Many an early explorer and traveller liked to carry a garnet with him, for the garnet was popular as a talisman and protective stone, as it was believed to light up the night and protect its bearer from evil and disaster. Today, science has taught us that the garnet's proverbial luminosity comes from its high refractive index.

Not only do garnets have many colours; they also have many names: almandine, andradite, demantoid, grossularite, hessonite, pyrope, rhodolite, tsavorite, spessartine, and uvarovite, to quote but a few. But let us restrict ourselves to the most important and begin with the red garnets. First, there is the fiery red pyrope. Its spirited red, often with a slight brownish nuance, was a gemstone colour much in demand in the 18th and 19th centuries. Garnets from a find in the north-eastern part of the former kingdom of Bohemia - small stones of a wonderful hue - were world-famous at that time. In Europe, they were worked into jewellery a good deal, especially in the Victorian period. That genuine Bohemian garnet jewellery was traditionally set with a large number of small stones, which were close to one another like the seeds of a pomegranate, with their red sparkle. And today too, garnets are still found in former Czechoslovakia and set close together according to the old tradition, the attractiveness of classical garnet jewellery thus consisting mainly in the beauty of the gemstones.

The larger central stones of the typical 'rosettes' are also mostly of garnet, though they belong to a different category. For the 'almandines', named after Alabanda, an ancient city, have a chemical composition that differs somewhat from that of the pyrope. And why, one might ask, are they used as central stones? That's quite simple: because Nature has created the pyrope almost exclusively in small sizes, whilst allowing the almandine to grow in rather larger crystals.

A further garnet variety, also red, is the rhodolite. a mixed crystal of almandine and pyrope. This popular garnet is of a magnificent velvety red with a fine violet or raspberry-red undertone. Originally found in the USA, it now comes mainly from the gemstone mines in East Africa, India and Sri Lanka.

The colourful world of the garnets

The specialist world was amazed a few years ago by the fantastic find of a type of garnet which had been very scarce until then. At the Kunene River, on the border between Namibia and Angola, a deposit of radiant orange to red 'spessartites' was discovered. The spessartite was originally named after the site of a find made in Germany. Spessartites had led a quiet, shadowy existence as stones for gemstone lovers and collectors until that momentous discovery in Namibia. There were hardly any used in jewellery because they were so very rare. But this new find changed the gemstone world. Since then, its wealth has increased by the addition of this unusually fine, intensely radiant orange-red gemstone. Under the trade name 'mandarine-garnet', this wonderfully orange noble garnet became world-famous in no time at all. Unfortunately, the mine in the quiet hills of Namibia was only able to be exploited for a few years. The search for gemstones in the remote bush country began to involve too much effort and became too expensive. So fears grew that this highly precious gemstone, which had shot into the firmament of the gemmological world like a rocket, might only become available in rare individual cases from the stocks of a few cutting-centres. That is, until another deposit of the orange treasures was discovered, this time in Nigeria. Their colour and brilliance are so similar to those of the mandarin garnets from Namibia that only an experienced specialist can discern the subtle differences.

Now for the green garnets. Green garnets?! Is there really such a thing? Indeed there is! In fact, several green varieties are known. First there is 'grossularite', created by Nature in many fine tones of yellow, green and brown and esteemed for its many fine interim hues and earth colours. Here too, there was a spectacular find: in the final year of the 20th century, extensive grossularite deposits were discovered in Mali. These Mali garnets captivate us with their great brilliance. Even the brown, which is otherwise not terribly popular, seems vivid and natural, and goes particularly well with ethnologically inspired trends.

Probably the best known green garnet is the tsavorite or tsavolite, which also belongs to the grossularite group. Tiffany's in New York gave this name to the previous emerald-green stone which was discovered in 1967 by a British geologist, Campbell R. Bridges, in the north-east of Tanzania - after the place where the discovery was made, near the Tsavo National Park with its wealth of game. The green of the tsavorite runs from vivid and light to deep and velvety and, like all garnets, it has particularly good brilliance.

The star of green garnets is the rare demantoid, a gemstone for connoisseurs and gemstone lovers. Its brilliance is positively tremendous, even greater than that of the diamond. Russia's star jeweller Carl Fabergé loved the brilliant green garnet from the Urals more than anything else, and used it in his creations. Meanwhile, the demantoid is no longer quite as scarce in the gemstone trade, thanks to some new finds in Namibia. Demantoids from Namibia are of good colour and brilliance, but they lack one tiny feature: the so-called 'horse-tail inclusions'. These fine, bushy inclusions are the unmistakable, typical feature by which a Russian demantoid is recognised.

Gemstones for every fashion trend

Anyone who loves what is pure and natural and the warm, sun-bathed colours of late summer will be fired with enthusiasm by the colour spectrum of the garnet. Today, garnets mostly come from African countries, but also from India, Russia and Central and South America. The skilled hands of cutters the world over work them into many classical shapes, but also increasingly into modern, imaginative designer cuts. Garnets remain convincing with their natural, unadulterated beauty, the variety of their colours and their tremendous brilliance. Anyone acquiring garnet jewellery can be assured that the joy he or she derives from this beautiful gemstone gift from Nature will be long-lasting and undimmed.

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Ametrine

Spinning purple into gold

Do you love both the purple of amethyst and the sunny gold of citrine? Are you an avid Minnesota Vikings fan? I have the perfect gem for you! Sometimes amethyst and citrine colours are found in the same crystal of quartz. These bicolour yellow and purple quartz gemstones are called ametrine.

With ametrine, you can have both gem colours for the price of one! Ametrine is especially inexpensive when you consider that it comes from only one mine in the world.

The Anahi Mine in Bolivia is the major world producer of ametrine. The mine first became famous in the seventeenth century when a Spanish conquistador received it as a dowry on marrying a princess named Anahi from the Ayoreos tribe. Ametrine was introduced to Europe through the conquistador's gifts to the Spanish queen. Ametrine is most typically faceted in a rectangular shape with a 50/50 pairing of amethyst and citrine. Sometimes a checkerboard pattern of facets is added to the top to increase light reflection. Ametrine can also be cut to blend the two colours so that the result is a mixture of yellow, purple, and peach tones throughout the stone. Ametrine is also popular among artistic cutters and carvers, who play with the colours, creating landscapes in the stone.

Ametrine is a very durable gemstone suited to a variety of jewellery uses. Most sizes and shapes are available but the colour contrast is most pronounced in sizes of over seven carats.

So why compromise, when you can have two varieties of quartz for the price of one?

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Citrine

Let's suppose that someone has bought a moped, yet his friends and acquaintances keep talking about his 'wonderful racing machine'. He surely feels confused, or feels that they are taking the mickey out of him. A moped was exactly what he wanted for short trips in good weather, but even the salesman said that he was now in possession of a 'real flyer'.

That's roughly how things go with the citrine, the stone for the month of November. Many people have come to know and love this stone under the name gold topaz, or Madeira or Spanish topaz, although in actual fact it has very little in common with the higher-quality gemstone topaz - except for a few nuances of colour. Thus the history of the citrine is closely interwoven with that of the topaz, and coincides with it completely when it comes to the interpretation of alleged miraculous powers. However, the citrine is a member of the large quartz family, a family which, with its multitude of colours and very various structures, offers gemstone lovers almost everything their hearts desire in terms of adornment and decoration, from absolutely clear rock crystal to black onyx. And it does so at prices which are by no means unaffordable.

The name is derived from the colour - the yellow of the lemon - , although the most sought-after stones have a clear, radiant yellowish to brownish red. Like all crystal quartzes, the citrine has a hardness of 7 on the Mohs scale and is thus, to a large extent, insensitive to scratches. It won't immediately take offence at being knocked about either, since its cleavage properties are non-existent. Even if their refractive index is relatively low, the yellow stones have just that mellow, warm tone that seems to have captured the last glow of autumn. Like golden Rhine wine or sparkling Madeira, heavy and sweet, citrine jewellery shimmers and brings a hint of sunshine to those dull November days.

There are not many yellow gemstones in the world of jewels. A diamond or a sapphire may be yellow - those will be expensive -, or sometimes a tourmaline or chrysoberyl, though these tend toward green somewhat, a golden beryl or eben a pure topaz, which we will mention again later on. However, the citrine fulfils everyone's colour wishes, from lemon yellow to reddish brown.

Rare though it is, yellow does in fact occur in quartz in Nature, if seldom, when there are traces of iron in the silicon dioxide. Historically, it has been found in Spain, on the Scottish island of Arran, in France, Hungary and in several mines overseas. Perhaps the citrine wouldn't have been talked about any more at all if, in the middle of the 18th century, it had not been for the discovery that amethysts and smoky quartzes can also be rendered yellow by so-called burning. This heat treatment at temperatures of between 470 and 560 degrees has to be carried out very carefully and requires a great deal of experience. However, in the course of 200 years, its application has become so much a matter of course that most of the stones available in the trade today are in fact burnt amethysts or smoky quartzes. Only a trained specialist can recognise the signs of heat treatment at all, burnt stones having subtle stripes whilst the yellow of natural ones is cloudy.

In Europe, the boom on these yellow to reddish crystal quartzes didn't begin until, in the 1930s, expatriate agate cutters from Idar-Oberstein sent large quantities of citrine back home, along with amethyst and agate, from Brazil and Uruguay. Thus the golden-yellow quartzes made a contribution to Idar-Oberstein's becoming - and remaining - one of the world's great gemstone centres. Just as they had been used to doing with agate and other kinds of quartz, the cutters faceted the citrine using large, rotating sandstones over decades. The raw stone was actually held in the cutter's hand during this process. If you give that a little thought, it will occur to you just how skilled the cutters from the Hunsrück really were.

The supply of Europe with sufficient raw material came just at the right moment for the nascent upheaval in social conditions. As the bourgeoisie grew in strength, the demand for jewellery across a broader spectrum of social strata also grew, and the citrine found a permanent niche for itself. Since until then it was really only the topaz which was known and used as a gold-coloured gemstone, the yellow and brown crystal quartzes quickly became very popular among the ladies, being known as gold topaz or smoky topaz, or by the double-barrelled names that proclaimed their origin. However, they were also found in step and table cuts as cuff-links and rings in the evening wardrobe of fine gentlemen. At the beginning, perhaps, the notion "it's all on the surface" may have played a part. But there was no other stone to which the wrong name clung as doggedly as the citrine. Even now, jewellery enthusiasts with no specialist knowledge may be astounded when you tell them that their 'gold topaz' is a citrine, in other words not a topaz at all, but quartz.

So what is it that constitutes the difference between the real topaz and the citrine? A fluorine aluminium silicate in chemical terms, the topaz is considerably harder and heavier than quartz, and it has a higher refractive index, which endows it with more fire when the colour is good. It does have one weakness: its good cleavage qualities, which must be taken into account when it is being worked on. It can be found in all the colours of the rainbow and has been known to Man for at least 2000 years. It has not been proved beyond doubt whether the name comes from Sanskrit or Greek, though the Greek name 'topazos' means 'green gemstone'. The Romans dedicated the topaz to Jupiter.

The colour in which the topaz is most commonly found is yellow, and that is the colour in which it occurs in one of the major German gemstone rocks, the Schneckenstein (a topaz-bearing rock said to resemble a snail) in Saxony. In the 18th century, it was mined there during a period of over 60 years. However, most of the crystals were hardly a centimetre in diameter. You had to go to Siberia or Brazil to find crystals as large as your fist. Having said that, anyone who is interested can convince himself of the beauty of cut specimens in the topaz set in Dresden's Grünes Gewölbe (Green Vault). The enormous and magnificent topaz from the Portuguese crown, the Braganza, was for a long time thought to be a diamond.

In mysticism, the topaz is attributed with a cooling, styptic and appetising effect. It is said to dispel sadness, anger and nocturnal fears, to warn its wearer of poisons and protect him or her from sudden death. It is reputed to make men handsome and intelligent and sterile women fertile and happy. However, it is probably better not to rely too much on its magical powers, since it was also claimed that you could immerse your hand in boiling water after a topaz had been thrown into it and retract it again unharmed!

In the Empire style, the topaz was still widespread, but then the more reasonably priced citrine took over from it and even usurped its name. Since then, the topaz has been a rather exotic figure in the jewellery trade, and has been given the additional predicate 'pure' to make it clear that the topaz, not the quartz topaz, is meant. And it is still waiting for its comeback to this day.

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Tanzanite

Tanzanite is an extraordinary gemstone. It occurs in only one place worldwide. Its blue, surrounded by a fine hint of purple, is a wonderful colour. Thanks to its unusual aura and the help of the New York jeweller's Tiffany, it has rapidly become one of the most coveted gemstones in the world.

It is named after the East African state of Tanzania, the only place in the world where it has been found. Africa? Does anyone think of gemstones when they hear that name? Well they should, because Africa is a continent which provides the world with a multitude of truly magnificent gemstones, like tanzanite for example. On its discovery in 1967, it was enthusiastically celebrated by the specialists as the 'gemstone of the 20th century'. They held their breath in excitement as they caught sight of the first deep-blue crystals which had been found in the Merelani Hills near Arusha in the north of Tanzania. Millions of years ago, metamorphic schists, gneisses and quartzites formed impressive, flat-topped inselbergs on a vast plain in the shadow of Kilimanjaro. The precious crystals grew in deposits on the inside of these unusual elevations. For a long, long time they were hidden from the eye of Man, until one day some passing Masai shepherds noticed some sparkling crystals lying in the sun and took them along with them.

In Merelani today, the search is carried on for the coveted crystals in several, smallish mines, in some cases using modern methods. As a rule, only small grains are found, but now and again the mineworkers succeed in fetching out a larger crystal – to the joy of the mine owners and that of the large number of tanzanite fans.

The tanzanite trade is in the hands of many licensed merchants, mostly on a small scale, who have, over the decades, built up stable, trusting business relationships with gemstone companies in India, Germany, Israel and the USA. An estimated 90 per cent of all tanzanite merchants are official members of the International Colored Gemstone Association ICA, and are thus bound by the high ethical standards of that organisation. In this way, this exclusive gemstone is not subject to trade via dubious channels, but instead, in spite of its rarity, passed on along reputable trade routes to established cutting-centres and subsequently to major jewellers all round the world.

Really just a blue zoisite ...

Tanzanite is a blue variety of the gemstone zoisite. It consists of calcium aluminium silicate and is not particularly hard, having a value of 6.5 to 7 on the Mohs scale. For that reason, it should always be worn carefully and never placed in an ultrasonic bath for cleaning or brought into contact with acids. When the first tanzanites were offered to the New York jewellery company Tiffany a short time after their discovery, they sparked an enthusiastic reaction. 'This gemstone is a sensation!', they said. However, they did make a recommendation to give the 'child' another name, since the gemmologically correct name 'blue zoisite' was felt to be too close to the English word 'suicide'. So Tiffany's proposed the name 'tanzanite', after the place where the stone had been found - a name which quickly came into general use in the trade. And it was Tiffany's who, two years after its discovery, presented the exclusive gemstone to the general public with a broad-based advertising campaign.

... but what a fantastic colour!

The deep blue of the tanzanite is fantastic, and runs from ultramarine blue to light violet-blue. The most coveted colour is a blue surrounded by a delicate hint of purple, which has a particularly wonderful effect in sizes of over 10 carats. The well developed polychromaticity of the tanzanite is typical: depending on the angle from which you look at it, the stone may appear blue, purple or brownish-yellow. Having said that, most raw crystals are somewhat spoiled by a brownish-yellow component, though it can be made to disappear by the cutter if he heats the stone carefully in an oven to approximately 500°. During the procedure he must pay careful attention to the moment at which the colour turns to blue. This burning is a method of treatment which is regarded as customary in the trade, but the raw stones must be as free of inclusions as possible, since otherwise fissures may occur. In fact working with tanzanite can sometimes give even the most experienced cutter a bit of a headache, the cleavage of this gemstone being very pronounced in one direction. This exclusive gemstone is cut in every imaginable shape from the classical round shape to a number of imaginative designer cuts.

A tanzanite will continue to fascinate with its unusual, captivating aura. Its deep blue with the slightly purple tinge is one of the most extravagant colours known to Man. It personifies immaculate, yet unconventional elegance. A person who acquires one of these exclusive gems is someone who wishes to set himself apart from the hoi polloi. A person who wears it exudes confidence and individuality. The almost magical colour of a perfectly cut tanzanite is one that not only suits confident young women; it is also excellently suited to underlining the individuality of the more mature woman.

In the meantime, almost any price you care to name is being asked - and paid! - for tanzanites of good quality and large size. What makes this stone so popular? Is it simply that fantastic colour? No, it is also the exclusivity of its origin. The stone is particularly highly prized because it is found in only one place in the whole world. The idea of possessing something that not everyone has has always been one of the main criteria in the way we esteem special gems.

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Aquamarine

From the light blue of the sky to the deep blue of the sea, aquamarines shine over an extraordinarily beautiful range of mainly light blue colours. Aquamarine is a fascinatingly beautiful gemstone. Women the world over love it for its fine blue shades which can complement almost any skin or eye colour, and creative gemstone designers are inspired by it as they are by hardly any other gem, which enables them to create new artistic cuts again and again.

Its light blue arouses feelings of sympathy, trust, harmony and friendship. Good feelings. Feelings which are based on mutuality and which prove their worth in lasting relationships. The blue of aquamarine is a divine, eternal colour, because it is the colour of the sky. However, aquamarine blue is also the colour of water with its life-giving force. And aquamarine really does seem to have captured the lucid blue of the oceans. No wonder, when you consider that according to the saga it originated in the treasure chest of fabulous mermaids, and has, since ancient times, been regarded as the sailors' lucky stone. Its name is derived from the Latin 'aqua' (water) and 'mare' (sea). It is said that its strengths are developed to their best advantage when it is placed in water which is bathed in sunlight. However, it is surely better still to wear aquamarine, since according to the old traditions this promises a happy marriage and is said to bring the woman who wears it joy and wealth into the bargain. An ideal gem, not only for loving and married couples.

A gemstone with many good qualities
Aquamarine is one of our most popular and best-known gemstones, and distinguishes itself by many good qualities. It is almost as popular as the classics: ruby, sapphire and emerald. In fact it is related to the emerald, both belonging to the beryl family. The colour of aquamarine, however, is usually more even than that of the emerald. Much more often than its famous green cousin, aquamarine is almost entirely free of inclusions. Aquamarine has good hardness (7.5 to 8 on the Mohs scale) and a wonderful shine. That hardness makes it very tough and protects it to a large extent from scratches. Iron is the substance which gives aquamarine its colour, a colour which ranges from an almost indiscernible pale blue to a strong sea-blue. The more intense the colour of an aquamarine, the more value is put on it. Some aquamarines have a light, greenish shimmer; that too is a typical feature. However, it is a pure, clear blue that continues to epitomise the aquamarine, because it brings out so well the immaculate transparency and magnificent shine of this gemstone.

'Santa Maria' sets pulses racing

The bright blue of this noble beryl is making more and more friends. The various colour nuances of aquamarine have melodious names: the rare, intense blue aquamarines from the Santa Maria de Itabira mine in Brazil, which make every gemstone lover's heart beat faster, are called 'Santa Maria'. Similar nuances come from a few gemstone mines in Africa, particularly Mozambique. To help distinguish them from the Brazilian ones, these aquamarines have been given the name 'Santa Maria Africana'. The 'Espirito Santo' colour of aquamarines from the Brazilian state of that name is of a blue that is not quite so intense. Yet other qualities are embodied in the stones from Fortaleza and Marambaia. One beautiful aquamarine colour was named after the Brazilian beauty queen of 1954, and has the name 'Martha Rocha'.

It can be seen from the names of aquamarine colours just how important Brazil is among the countries where aquamarine is found. Most of the raw crystals for the world market come from the gemstone mines of that large South American country. Every now and then, large aquamarine crystals of immaculate transparency are also found with a magnificent colour, a combination which is very unusual in gemstones. And very occasionally, sensationally large aquamarine crystals come to light in Brazil, such as the crystal of 110.5 Kg found in 1910 in Marambaia/Minas Gerais, or for example the 'Dom Pedro', weighing 26 Kg and cut in Idar-Oberstein in 1992 by the gemstone designer Bernd Munsteiner, the largest aquamarine ever to have been cut. However, aquamarines are also found in other countries, for example Nigeria, Zambia, Madagascar, Mozambique, Afghanistan and Pakistan.

Favourite stone of modern designers

There is hardly any other gemstone in modern jewellery design which is refined in such a variety of ways as aquamarine. Whether it is fashioned as a clear, transparent gem in the classical step cut, or creatively cut in a more modern design, it is always fascinatingly beautiful. Uncut too, or with many inclusions which can be brought into play by the designer in the way in which the stone is cut, it can be refined to produce the most beautiful creations. Designers call it their favourite gemstone. Again and again they take the world by surprise with a new, modern artistic cut, and when they are breaking new ground, aquamarine is a gem that they particularly like to work with. Without doubt, these creative designer cuts have contributed to the great popularity of this gem. The lucid colour of aquamarine makes it easy to see inclusions. For this reason, aquamarine should always be of the greatest possible transparency. On the other hand, particularly charming effects can sometimes be achieved in the way the gemstone is cut by bringing the inclusions into play. The light colour of aquamarine leaves the gemstone designer free to bring out the brilliance of the gem with fine grooves, notches, curves and edges. In this way, each aquamarine becomes a unique specimen, whose magical attraction no woman can resist.

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Peridot

The vivid green of the peridot, with just a slight hint of gold, is the ideal gemstone colour to go with that light summer wardrobe. No wonder – since the peridot is the gemstone of the summer month of August.

The peridot is a very old gemstone, and one which has become very popular again today. It is so ancient that it can be found in Egyptian jewellery from the early 2nd millennium B.C.. The stones used at that time came from a deposit on a small volcanic island in the Red Sea, some 45 miles off the Egyptian coast at Aswan, which was not rediscovered until about 1900 and has, meanwhile, been exhausted for quite some time. Having said that, the peridot is also a thoroughly modern gemstone, for it was not until a few years ago that peridot deposits were located in the Kashmir region; and the stones from those deposits, being of an incomparably beautiful colour and transparency, have succeeded in giving a good polish to the image of this beautiful gemstone, which had paled somewhat over the millennia.

The ancient Romans too were fond of this gemstone and esteemed its radiant green shine, which does not change even in artificial light. For that reason they nicknamed it the 'emerald of the evening'. Peridot is also found in Europe in medieval churches, where it adorns many a treasure, for example one of the shrines in Cologne Cathedral. During the baroque period, the rich green gemstone once again enjoyed a brief heyday, and then it somehow faded into oblivion.

Spectacular 'Kashmir peridots'

But suddenly, in the middle of the 1990s, the peridot was the big sensation at gemstone fairs all round the world. The reason? In Pakistan, up on an inhospitable pass at some 4000 metres (13,120 ft.), a sensationally rich deposit of the finest peridots had been found. In tough climatic conditions which permitted the gemstones to be mined only during the summer months, the unusually large, fine crystals and fragments were brought down into the valley. These stones were finer than anything that had ever been seen before. And the deposits were so rich that the demand for peridots can, for the present, easily be satisfied.

In order to emphasise the special quality of the peridots from Pakistan, these stones are offered as 'Kashmir peridots', following the famous Kashmir sapphires. Creative gemstone cutters have succeeded in cutting some fascinatingly beautiful one-off stones of more than 100 carats from some of the large, fine, clear crystals with their magnificent rich green!

How green? It all depends on the iron

This gemstone has no fewer than three names: 'peridot', 'chrysolite', from the Greek 'gold stone', and 'olivine', for the peridot is the gemstone form of the mineral olivine. In the gemstone trade it is called 'peridot', derived from the Greek word 'peridona', which means something like 'to give richness'.

The peridot is one of the few gemstones which come in one colour only. The rich, green colour with the slight tinge of gold is caused by very fine traces of iron. From a chemical point of view, peridot is an iron magnesium silicate. The intensity of the colour depends on the amount of iron actually present. The colour itself can vary over all shades of yellowish green and olive, and even to a brownish green. Peridot is not particularly hard - only 6.5 to 7 on the Mohs scale - but it is easy to look after and fairly robust. Peridot cat's eyes and star peridot are particularly rare and precious.

The most beautiful stones come from the border area between Pakistan and Afghanistan. However, the peridot as a gemstone also exists in Myanmar, China, the USA, Africa and Australia. Stones from East Burma, now known as Myanmar, have a vivid light green and fine inclusions with a silky shine to them. Peridot from Arizona, where it is popularly used in native American jewellery, often has somewhat yellowish or gold-brown nuances.

Uncomplicated, but not for the cutter

The peridot is cut in accordance with its crystal shape, mostly faceted or in classical table cuts, or round, antique, as an octahedron or oval. Smaller crystals are cut into standardised series stones, larger ones into imaginative one-offs. Cabochons are made if the material contains more inclusions, for the domed cut brings out the fine silky shine of the inclusions to their best. The cutters know full well that this gemstone is anything but easy to work with. The raw crystals can be very tricky and may crack easily. There is often a good deal of tension on the inside of the crystal. But once the cutter has succeeded in removing the coarser inclusions, the peridot is a precious stone with good wearing qualities which does not call for any special care.

An ideal summer stone

The peridot adds a wonderful variant to the colour spectrum of green gemstones. Increasingly, it is processed not only to one-offs, but also for use in series jewellery. And since the world of fashion is just in the process of rediscovering its love for the colour green, the popularity of this rich green gemstone is also very much on the up.

Thanks to the rich finds in Pakistan and Afghanistan, there is enough raw material on the market, so the 'right stone' can now be found to cater for each individual taste and each pocket. Large, transparent stones of an intense colour are, however, rare and correspondingly expensive. The peridot is a gemstone that you should definitely get to know better. Its fine pistachio to olive green is the perfect complement to a fresh, light summer wardrobe.

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Topaz

It is a fluorine aluminium silicate and comes in yellow, yellow-brown, honey-yellow, flax, brown, green, blue, light blue, red and pink ... and sometimes it has no colour at all. The topaz. The topaz has been known for at least 2000 years and is one of the gemstones which form the foundations of the twelve gates to the Holy City of the New Jerusalem. These so-called apocalyptic stones are intended to serve in protection against enemies and as a symbol of beauty and splendour. It cannot be proved conclusively whether the name of the topaz comes from the Sanskrit or the Greek, though the Greek name 'topazos' means 'green gemstone'. The Romans dedicated the topaz to Jupiter.

The colour in which the topaz is most commonly found is yellow, and that is the colour in which it occurs in one of the major German gemstone rocks, the Schneckenstein (a topaz-bearing rock said to resemble a snail) in Saxony. In the 18th century, it was mined there during a period of over 60 years. However, most of the crystals were hardly a centimetre in diameter. You had to go to Siberia or Brazil to find crystals as large as your fist. Having said that, anyone who is interested can convince himself of the beauty of cut specimens in the topaz set in Dresden's Grünes Gewölbe (Green Vault). The enormous and magnificent topaz from the Portuguese crown, the Braganza, was for a long time thought to be a diamond. It weighs 1680 ct..

In mysticism, the topaz is attributed with a cooling, styptic and appetising effect. It is said to dispel sadness, anger and nocturnal fears, to warn its wearer of poisons and protect him or her from sudden death. It is reputed to make men handsome and intelligent and sterile women fertile and happy. However, it is probably better not to rely too much on its magical powers, since it was also claimed that you could immerse your hand in boiling water after a topaz had been thrown into it and retract it again unharmed! It is the stone of the month November.

In the Empire style, the topaz was still widespread, but then the more reasonably priced citrine took over from it and even usurped its name - gold topaz. Since then, the topaz has been a rather exotic figure in the jewellery trade, and has been given the additional predicate 'pure' to make it clear that the topaz, not the quartz topaz, is meant. And it is still waiting for its well deserved comeback to this day.

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Opals

All of Nature’s splendour seems to be reflected in the manifold opulence of fine Opals: fire and lightnings, all the colours of the rainbow and the soft shine of far seas. Australia is the classical country of origin. Almost ninety-five per cent of all fine opals come from the dry and remote outback deserts.Numerous legends and tales surround this colourful gemstone, which can be traced back in its origins to a time long before our memory, to the ancient dream time of the Australian aborigines. It is reported in their legends that the creator came down to Earth on a rainbow, in order to bring the message of peace to all the humans. And at the very spot, where his foot touched the ground, the stones became alive and started sparkling in all the colours of the rainbow. That was the birth of the Opals.

The group of fine Opals includes quite a number of wonderful gemstones, which share one characteristic: they shine and sparkle in a continually changing play of colours full of fantasy, which experts describe as “opalising”. Depending on the kind, place of occurrence, and colour of the main body, we differentiate Dark or Black Opal, White or Light Opal, Milk or Crystal Opal, Boulder Opal, Opal Matrix, Yowah Nuts from Queensland – the so-called “picture stones“, and also Mexican and Fire Opal. Opal variations are practically unlimited. They all show in their own special way that unique play of colours – except for Fire Opal, which due to its transparency, however, is nevertheless also considered a Fine Opal specimen. If Opals are lacking the typical play of colours, they are simply named “Common Opal”.

Upala, opallios or Opalus – fascination created by tiny spheres

The name Opal was probably derived from Sanskrit “upala“, meaning ”valuable stone“. This was probably the root for the Greek term “opallios”, which translates as “colour change”. In the days of Roman antiquity there existed a so-called “opalus”, or a “stone from several elements”. So the ancient Romans may already have had an inkling why the Opals show such a striking play of colours. But we will come to this later …

Pliny, the famous Roman author, called Opal a gemstone which combines the best possible characteristics of the most beautiful of gemstones: the fine sparkle of Almandine, the shining purple of Amethyst, the golden yellow of Topaz, and the deep blue of Sapphire, ”so that all colours shine and sparkle together in a beautiful combination“.

Up to the first half of the 19th century, Opals were relatively rare. But then their career boomed suddenly and made them one of the most popular gemstones, and the start of this development brought them to the gemstone cutters of the gemstone centre of Idar-Oberstein. In the era of Art Deco the Opals experienced their flourishing, with contemporary gemstone artists preferring them to all other stones because of their subdued charm, which in turn was excellently suited to be combined with enamel, another very popular material of those days.

Opal’s colour play emanates a very special attraction and fascination. But what causes this phenomenon? This question was impossible to answer for a very long time. Only when in the 1960s a team of Australian scientists analysed Opals with an electron microscope, it was discovered that small spheres from silica gel caused interference and refraction manifestations, which are responsible for the fantastic play of colours. The spheres, which are arranged in more or less compact structures, succeed in dissecting the light on its passage through the gemstone and turning it into all the colours of the rainbow, always new and always different.

Australia, classical Opal country

Australia is the classical Opal country and today is the worldwide most important supplier of Fine Opals. Almost 95 per cent of all Opals come from Australian mines. The remaining five per cent are mined in Mexico, and in Brazil’s north, also in the US states of Idaho and Nevada, but recently the stones have also been found in Ethiopia and in the West African country of Mali.

The history of Australian Opal began actually millions of years ago, when parts of Australia were covered by a vast inland sea, and stone sediment was deposited along its shoreline. When the water masses flooded back, they flushed water containing silica into the resulting cavities and niches in the sedimentary rocks, and also the remains of plants and animals were deposited there. Slowly the silica stone transformed into Opal, for basically Opals are simply a combination of silica and water. Or, to be more precise: Opals are a gel from silica, with varying percentages of water.

In 1849 the first Opal blocks were accidentally found on an Australian cattle station called Tarravilla . the first Opal prospectors started in 1890 at White Cliff mining the Opal rocks. And even today the eyes of Opal lovers light up when somebody mentions places like White Cliffs, Lightning Ridge, Andamooka or Coober Peddy: for these are the legendary sites of the Australian Opal fields. The most famous one is probably Lightning Ridge, the place where mainly the coveted Black Opal is found. Andamooka, where Crystal Opal and Light Opal are brought to the light of day, cam boast to be the place where the probably largest Opal was found, with a weight of 6 ,843 kilograms, the “Andamooka Desert Flame”. Coober Peddy, by the way, is a word from Aborigine language meaning „white man in a hole“. This clearly describes how Opal was in fact mined: many Opal prospectors made their home in deep holes or caves in the ground, to protect themselves from the burning heat of daytime and from the icy winds of night time. Usually they worked only with tolls such as pick and shovel. Buckets full of soil, hopefully containing Opal rocks, were pulled up out of the depths of 5 to 40 m deep shafts by hand, for this is the depth of the Opal containing crevices and cavities, which are also mined nowadays.

Being an Opal prospector is still not an easy job, although today of course there are some technical means available, such as trucks or conveyor belts. And still the hope to make the find of a lifetime which will let you live happily ever after attracts many men and women to come to the hot and dusty Australian outback.

About cabochons, doublets and triplets

In order to best bring out the play of colour in a Fine Opal, the stones are cut and polished to round or oval cabochons, or any other softly domed shape , depending on the raw material. Only the best qualities of Fire Opal, however, are suited to faceting. The Opal cutter will first of all carefully remove any impurities using a diamond cutting wheel, before working out the rough basic shape. The comes the fine cutting, the finishing with sandpaper and then the final polishing with a wet leather wheel.

Opal is often found as flat lenses, or thin layers, bigger pieces are rather rare. If you leave a thin but supporting layer of the harder mother rock, you will receive a pre-stage of the Opal-doublets which are frequently used today for mass produced jewellery. These are gemstone combinations consisting of a surface from millimetre-thin Opal plates, which have been mounted on Onyx, Obsidian, artificial black glass, or Potch-Opal. Triplets have been developed from this design, here the Opal layer receives an additional cover from Rock Crystal, Plastic, Hard Glass or Lead Glass for protection.

Opal love to be worn on the skin

Due to the differing percentage of water, Opals may easily become brittle. They always contain water – usually between 2 and 6 per cent, but sometimes even more. Thus if stored too dry or exposed to heat over a longer period of time, Opals will show fissures and the play of colour will become paler. Therefore, Opal jewellery should be worn as often as possible, for then the gemstone will receive the needed humidity from the air and from the skin of its wearer.

Opals are not very hard: they only achieve 5.5 to 6 on the Mohs’ scale. Therefore they appreciate a protective setting. In earlier days Opal’s sensitive surface was often oiled, but today also sealing them with colourless artificial resin has become quite popular.

From Harlequin to Peacock: Opal experts lingo

When Opal experts talk about “harlequin”, “church windows” or “needle fire”, do not be surprised. They are probably discussing Opals. The play of colour in this stone is described with many imaginative terms for various structures and phenomena, like, for example, “flame opal”, “lightning and peacock opal”, or the above named “harlequin” and “church window”.

Opal’s value is not only determined by the body colour, transparency and factors based on place of occurrence. (Body colour refers to the basic colour of the gemstone, which can be black, dark or light and coloured). It is also important if the stone is transparent, translucent or opaque. And the opalizing effect may also influence the transparency.

Black Opal or Opal with a dark grey body shows the most brilliant play of colours imaginable. Crystal opal, which comes immediately after Black Opal in the hit list, should be more transparent with a deep play of colours. White or milky Opals show more diffuse colours and are the least expensive Opals. The occurrence-specific characteristics include, for instance, denominations such as “Black Opal from Lightning Ridge” (we are talking absolute top luxury here) or “Mexican Fire Opal”.

The most important criterion for determining the price of an Opal, however, is the play of colour, the colours as such and their pattern. If the colour red appears when looking through the stone, all the other colours will appear also. For evaluating Opals the thickness of the Opal layer is considered, the beauty of the patterning, the cut, weight and finish. Finally the total impression will be decisive, and of course offer and demand will determine ho much you will have to pay for “your” Opal. If you are interested in a really valuable specimen, get an Opal expert to advise you, because it takes a real expert to know about the many criteria which determine the price.

Opals and emotions

For ages people have been believing in the healing power of Opal. It is reported to be able to solve depressions and to help its wearer find the true and real love. Opals are supposed to further enhance the positive characteristics for people born under the zodiac sign of Cancer. Black Opal is recommended to those born under Scorpio, and Boulder Opal is the lucky stone for Aries.

The fantastic colour play of Opal reflects changing emotions and moods of people. Fire and water, the sparkling images of Boulder Opal, the vivid light flashes of Black Opal or the soft shine of Milk Opal – striking contrasts characterise the colourful world of this fascinating gemstone. Maybe this is the reason why it depends on our daily mood which Opal we prefer. Opals are like human emotions: you always experience them different and anew.

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