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2. List of individual gemstones - Wikipedia

   en.wikipedia.org/wiki/List_of_individual_gemstones

   Andamooka Opal, presented to Queen Elizabeth II, also known as the Queen's Opal; Flame Queen Opal; Galaxy Opal; Halley's Comet Opal, the world's largest uncut black opal; Olympic Australis Opal, reported to be the largest and most valuable gem opal ever found

3. Opal - Wikipedia

   en.wikipedia.org/wiki/Opal

   The black fire opal is the official gemstone of Nevada. Most of the precious opal is partial wood replacement. The precious opal is hosted and found in situ within a subsurface horizon or zone of bentonite, which is considered a "lode" deposit. Opals which have weathered out of the in situ deposits are alluvial and considered placer deposits.

4. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Rare or unusual gemstones, generally understood to include those gemstones which occur so infrequently in gem quality that they are scarcely known except to connoisseurs, include andalusite, axinite, cassiterite, clinohumite, painite and red beryl. [27] Gemstone pricing and value are governed by factors and characteristics in the quality of the ...

5. Slocum stone - Wikipedia

   en.wikipedia.org/wiki/Slocum_stone

   Slocum Stone is a silicate glass which shows traces of sodium, magnesium, aluminum and titanium. [6] It was manufactured in several base colors, and the opalescence is produced by very thin layers of metallic film (estimated at 30 nanometres in thickness [ 7 ] ), in the form of translucent flakes, which produce a thin-film interference effect.

6. 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]

7. Halley's Comet Opal - Wikipedia

   en.wikipedia.org/wiki/Halley's_Comet_Opal

   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]