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A harder garnet makes the stones more durable. In the case of opal doublets, a backing layer of onyx or matrix gives the more fragile opal layer support and can make the opal look darker and higher quality. Garnet and glass doublets were first used around 1850 when it was noted that molten glass would adhere to garnet.
The Flame Queen Opal is perhaps the best-known example of "eye-of-opal", an eye-like effect created when opal in-fills a cavity. [ 1 ] The Flame Queen's flat central raised dome flashes red or gold depending on the angle of view, and is surrounded by a band of deep blue-green, giving the stone an appearance somewhat like that of a fried egg.
Ammolite is an opal-like organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America.It is commonly unearthed by natural erosion or through the process of various mining practices, within the perimeter of an ancient sea bed called the Western Interior Seaway. [2]
In fact, as it gets darker around the opal, the opal appears ever more vibrant. The stone's vivid and sparkly nature is in stark contrast to Coober Pedy, Australia where it was discovered.
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The Yowah opal field in the Shire of Paroo. The Yowah nut is a type of precious opal, found within the Yowah opal fields situated in Yowah, Shire of Paroo, South West Queensland, Australia since the latter part of the 19th century. [1] These opals are known for their distinctive nut-like shape, opalescent patterns, and vibrant colours.
Jewelry applications of precious opal can be somewhat limited by opal's sensitivity to heat due primarily to its relatively high water content and predisposition to scratching. [12] Combined with modern techniques of polishing, a doublet opal can produce a similar effect to Natural black or boulder opal at a fraction of the price.
The Halley's Comet Opal is a very fine specimen, with few flaws or blemishes and a large green and orange 1.6 cm (0.63 in) thick color bar which goes through the opal. Formed about 20 million years ago, it is an example of a nobby, which is a natural lump-shaped opal found only at Lightning Ridge. [2] As of 2006 it was for sale at $1.2 million. [3]
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