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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.
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]
Meet the "Virgin Rainbow" – perhaps the finest and certainly the most expensive opal on record. It literally glows in the dark. In fact, as it gets darker around the opal, the opal appears ...
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.
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Foil opals are simulated opal gemstones that first came into vogue during the jewelry-making boom of the late-Victorian era. Across Europe and the United States, these faux gemstones joined their paste counterparts (simulated diamonds, emeralds, rubies and sapphires made from glass) as the need for jewelry outstripped both gemstone availability and nouveau middle-class budgets.
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