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  2. Doublet (lapidary) - Wikipedia

    en.wikipedia.org/wiki/Doublet_(lapidary)

    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.

  3. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    Opals too thin to produce a "natural" opal may be combined with other materials to form "composite" gems. An opal doublet consists of a relatively thin layer of precious opal, backed by a layer of dark-colored material, most commonly ironstone, dark or black common opal (potch), onyx, or obsidian. The darker backing emphasizes the play of color ...

  4. World's most expensive opal literally glows in the dark - AOL

    www.aol.com/news/2015-08-13-world-s-most...

    It literally glows in the dark. In fact, as it gets darker around the opal, the opal appears ever more vibrant. ... Museum in Adelaide which will be presenting it as part of their "Opals" exhibit ...

  5. Ammolite - Wikipedia

    en.wikipedia.org/wiki/Ammolite

    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]

  6. Fire of Australia opal - Wikipedia

    en.wikipedia.org/wiki/Fire_of_Australia_Opal

    Around ninety percent of the world's opals are found in South Australia. [1] [3] After its discovery in 1946, the opal remained in Bartram's family until 2017, when it was sold to the South Australian Museum. [4] The opal was sold for A$500,000, despite its estimated market value of A$900,000, [3] [5] to ensure that it remained uncut. [4]

  7. Yowah nut - Wikipedia

    en.wikipedia.org/wiki/Yowah_Nut

    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.

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