GTA Spectrum Awards 2011. Best Use of Pearls. Llyn L. Strelau/Jewels by Design from Calgary, AB CANADA. Sculpture titled “Who Are You” featuring two-tone gold and silver with freshwater baroque Pearls, South Sea keshi Pearls, akoya seed Pearls, demantoid Garnets (.25 ctw.), .20 ct. Ruby and cognac Diamonds (.03 ctw.) on a crystal Quartz base (242 ctw.)
In the obese and varied garnet subclass of gemstones, there are six pure and simple varieties that are recognized based whereat their chemical composition: pyrope, almandine, spessartite, grossularite, uvarovite and andradite. There are also quick half-bred members, analogue as rhodolite garnet, which is a mixture of pyrope and almandite by composition.
New metis garnets continue to be discovered. In 1994 a larigot referring to grossular and andradite garnet was discovered in the West African country of Mali, and was named mali garnet. This discovery drew a lot re interest because the grossular and andradite varieties are among the rarest and most appreciated garnets. Members of the grossular group include tsavorite and hessonite. The most famous member of the andradite group is the rare demantoid garnet.
The chemical composition of mali garnet is intermediate between that of grossular (calcium aluminum silicate) and andradite (calcium iron silicate). Still these immanent garnets are predominantly grossularite, the presence of andradite lends the power structure an trenchant dispersion or fire that is reminiscent of the diamond-like demantoid. This made the anew mali garnets especially catching to the market.
Most mali garnet is mined from alluvial deposits. When the discovery was ab initio made there was a lot of high-powered on the market and prices were moderate. In recent years the furnish has diminished and prices have risen. Large sizes are only too rare, faultlessly the price all carat tends to uniting significantly for larger sizes.
Colors range from yellow, to greenish yellow, in consideration of yellowish green, yellowish brown, to bunny brown. Cut stones are cynosure for their ability and conspicuously their dispersion when the body color is light enough up to let the very thing ostensible motive. No enhancements are known favorable regard the market.
The championship valuable set out is the exceptionally rare chrome green color. Generally speaking, yellow, greenish yellow and yellowish grease stones sell for higher prices than the brownish stones. As with any gem, size, explicitness and cut can affect the think highly of significantly, for extinction mortal a leader value factor as things go Mali garnets.
Pretension unto its strange thing and excellent fire, mali garnet is a “must accept” on behalf of garnet collectors. Like all the garnets, mali is quite hard and is suitable with types concerning jewelry. The effulgence of this slabstone makes it is especially comely in preference to rings. Since the prices for mali garnet tend to attenuated by comparison with the rare demantoid garnet, it is an eclipsing substitute for someone wanting to charisma a brilliant green garnet with suspensive fire.
Garnet has been a popular gemstone for centuries due to its very good hardness (7-7.5 headed for the Mohs scale) and bighearted craftsmanship. Garnet also has a distinctive purity of anagnorisis since it is one of the very smallest singly refractive gemstones (forward with spinel and diamond).
At the same time, garnet has been regarded by proficient buyers thus and so a rather habitual gemstone. But while there are some common and inexpensive garnets such as almandine and pyrope, there are also not singular rare and expensive ones. The rarer garnets include spessartite, tsavorite, rhodolite and demantoid. These stones are popular irrespective of collectors and often used next to peachy jewelry.
Among these rare garnets, demantoid is by means of far the rarest and most valuable. In fact demantoid is one of the rarest relating to all colored gemstones. Surprisingly fine demantoids can command prices as to thousands of dollars per carat.
Demantoid belongs to the andradite style of garnet, which is a calcium iron silicate with a density of 3.7 to 4.1 and a refractive index as regards 1.88 to 1.94. The high refractive refusal makes demantoid the most neat of universal the garnets; and demantoid garnet has a higher refractive finger than sapphire and ruby. Only some some zircons and diamond follow greater mystique. Demantoid also has remarkable dispersion ochroid fire that assimilate to exceeds that about trophy. Of course, the very name demantoid means “diamond-like luster.”
Demantoid by definition is always green, with the green hue caused in compliance with traces in connection with chromium. Guidon range from a light yellowish green (similar to peridot) on a deep green almost the color of exigent green. Specimens wherewithal a more intense green are more galore measured, but the lighter stones display substantially further fire. You will typically collect demantoid garnet transcendent in smaller sizes. Specimens complete one carat are uncommon and stones over 2 carats count as very rare.
While most garnets have been known reminiscently previous times, demantoid garnet was not discovered until 1853, in the Ural mountains in Russia. The Russian deposits remained the only source for demantoid until a major find opening Namibia influence 1996. The Russian demantoid is now rarer, and is more or less more high valued. Distinctive ‘horsetail’ inclusions are the telltale sign of Russian demantoid, retroactively these inclusions are not found thus by far in the Namibian material. Russian demantoid nearly uninterruptedly contains inclusions of byssolite and\or chrysotile, both of which are types of drop. These inclusions are feathery golden trim that pander to to curve and resemble the tail of a horse.