Crossword Genius

Coober Pedy product (4)

Ross

I believe the answer is:

opal

(Other definitions for opal that I've seen before include "Form of hydrated silica, often used as a gemstone" , "Glassy gemstone" , "item in Hatton Garden?" , "precious jewel" , "Milky-white gemstone with flashes of colour" .)

I've seen this clue in the Sydney Morning Herald.
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