Gemstones with white black and fire varieties

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Possible Answers: Opals.

Last seen on: Daily Celebrity Crossword – 9/22/18 Smartypants Saturday

Random information on the term “Opals”:

Cacholong, also known as Kalmuck agate,[1] is a form of common opal, although it is often mistaken for agate or chalcedony. A milky white colour with a Mohs hardness of about 6, it is used for carving, cameos, etc. Found in Austria, Czech Republic, Mongolia and Uzbekistan, its name possibly comes from a river in Uzbekistan.

Opals on Wikipedia