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2. Opal - Wikipedia

   en.wikipedia.org/wiki/Opal

   The world's largest and most valuable gem opal "Olympic Australis" was found in August 1956 at the "Eight Mile" opal field in Coober Pedy. It weighs 17,000 carats (3.4 kg; 7.5 lb) and is 11 inches (280 mm) long, with a height of 4 + 3 ⁄ 4 in (120 mm) and a width of 4 + 1 ⁄ 2 in (110 mm).

3. 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

4. Koroit opal field - Wikipedia

   en.wikipedia.org/wiki/Koroit_opal_field

   The Koroit opal field is known for the very distinctive type of boulder opal that is found in its mines. In Queensland boulder opal is found within a 300 km wide belt of sedimentary rocks in the Winton Formation. Here opal is found as a kernel in small concretions. [1] The Koroit Opal field was discovered in 1897 by Lawrence Rostron.

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

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

   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 ...

6. Quilpie, Queensland - Wikipedia

   en.wikipedia.org/wiki/Quilpie,_Queensland

   Boulder opal, oil and gas mining are major secondary industries for the local economy. The majority of the employees of these industries are local residents, with low rates of both unemployment and itinerant work. Quilpie has one opal mining field; Toompine Field is located between Quilpie and Yowah.

7. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 hide