Crossword Genius

White gemstone (4)

Ross

I believe the answer is:

opal

'white gemstone' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for opal that I've seen before include "Shimmering stone" , "raw material" , "National gemstone of Australia" , "Gem with delicate colours" , "Delicately-coloured gem" .)

I've seen this clue in the New York Times, the Newsday.com and the Newsday.
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