A lovely and very rare Natural Russian Demantoid Garnet & Diamond Ring set in 18k White Gold. The photos do NOT do this fine piece of jewelry justice. One of the prettiest rings we have seen in our very high volume jewelry estate buying shop in years. This ring is in Excellent/New Condition. The sparkle given off by these Garnet's is spectacular.
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This is taken from Gemworld: *****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. 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.*****
The way to tell whether the Demantoid is Russian or Nambian is by locating horsetail wisps within the stone. The prized Russian variety contains these wisps, the Nambian variety does not. With a strong loupe you can see the thin brownish wisps and this piece was purchased at the finest, high-end jeweler in Boston for $11,000 many years ago.
The ring contains 9 round cut and very brilliant Natural Russian Demantoid gemstones measuring 3.6 - 4.1 mm. Each Demantoid has a ring of diamonds surrounding it. A total of 126 round brilliant full cut diamonds in nine circles. The diamonds are F-G Color and VS Clarity. Each diamond measures approximately 1.5 - 1.7 mm
The 18k white gold ring measures size 8 and weighs 9.8 grams.
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