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2. Opal - Wikipedia

   en.wikipedia.org/wiki/Opal

   Common rough opal White and blue opal from Slovakia. Besides the gemstone varieties that show a play of color, the other kinds of common opal include the milk opal, milky bluish to greenish (which can sometimes be of gemstone quality); resin opal, which is honey-yellow with a resinous luster; wood opal, which is caused by the replacement of the ...

3. Gemstone Meanings: Power and Significance of the 25 Most ...

   www.aol.com/gemstone-meanings-power-significance...

   To find out—and to uncover gemstone meanings—we chatted with jeweler Lisa Salzer, ... Opal “One of the most beautiful and magical gemstones, opals have a visual fire inside, often reflecting ...

4. Opalescence - Wikipedia

   en.wikipedia.org/wiki/Opalescence

   Opalescence or play of color is an optical phenomenon associated with the mineraloid gemstone opal, [1] a hydrated silicon dioxide. [2] This effect appears as a milky, translucent glow that changes with the angle of light, often creating a soft, pearly sheen that can display various colors or hues.

5. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Each crystal is characteristic to the environment and growth process under which it was created. Visible banding in an apatite gemstone. Gemstones created from the flame-fusion process may have small air bubbles which were trapped inside the boule during formation process; visible banding from formation of the boule

6. 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

7. 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. ... it as part of their "Opals" exhibit to celebrate 100 years of gemstone mining in ...