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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

   Andamooka in South Australia is also a major producer of matrix opal, crystal opal, and black opal. Another Australian town, Lightning Ridge in New South Wales, is the main source of black opal, opal containing a predominantly dark background (dark gray to blue-black displaying the play of color), collected from the Griman Creek Formation. [30]

4. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Musgravite was discovered in 1967 in the Musgrave Mountains in South Australia and named for the location. Black Opal – the rarest type of opal. Black opal is directly mined in New South Wales, Australia, making it the rarest type of opal. Having a darker composition, this gemstone can be in a variety of colours.

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

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

   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.

6. Lightning Ridge, New South Wales - Wikipedia

   en.wikipedia.org/wiki/Lightning_Ridge,_New_South...

   Lightning Ridge is a small outback town in north-western New South Wales, Australia. Part of Walgett Shire, Lightning Ridge is situated near the southern border of Queensland, about 6 km (4 mi) east of the Castlereagh Highway. The Lightning Ridge area is a centre of the mining of black opal and other opal gemstones.

7. Andamooka Opal - Wikipedia

   en.wikipedia.org/wiki/Andamooka_Opal

   The Andamooka Opal is a famous opal which was presented to Queen Elizabeth II in 1954 on the occasion of her first visit to South Australia. The opal was mined in Andamooka in 1949. The opal was cut and polished by John Altmann to a weight of 203 carats (40.6 g).