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2. Opal - Wikipedia

   en.wikipedia.org/wiki/Opal

   The Wollo Province opal was different from the previous Ethiopian opal finds in that it more closely resembled the sedimentary opals of Australia and Brazil, with a light background and often vivid play-of-color. [38] Wollo Province opal, more commonly referred to as "Welo" or "Wello" opal, has become the dominant Ethiopian opal in the gem ...

3. File:Black opal (Stayish Mine, Wollo Province, Ethiopia) 6 ...

   en.wikipedia.org/wiki/File:Black_opal_(Stayish...

   Description: Precious opal (black opal) from the Tertiary of Ethiopia. (cut & faceted specimen; the long axis is 8 to 9 mm) A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties.

4. 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

5. Mining in Ethiopia - Wikipedia

   en.wikipedia.org/wiki/Mining_in_Ethiopia

   The Ethiopian Geological Survey of the Ministry of Mines and Energy (MME) with assistance from UNDP and private companies have assessed the mineral and petroleum resources of Ethiopia. The resources discovered in different regions of the country are mainly gold, tantalum , phosphorus , iron , salt , potash , soda ash , gemstones, coal ...

6. 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.

7. Doublet (lapidary) - Wikipedia

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

   A doublet is a type of assembled gem composed in two sections. [1] It is sometimes used to imitate other, more expensive gems. Opal Doublet. A garnet and glass doublet uses a top portion of natural garnet fused to any color of glass to imitate a gem. The color of glass used in the doublet is all that is seen, as the garnet provides no color.