Crossword Genius

Milky gem (4)

Ross

I believe the answer is:

opal

'milky gem' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for opal that I've seen before include "Milky iridescent stone" , "One in a ring perhaps" , "Milky-white gem" , "Variegated gemstone" , "Semi-precious stone of milky or bluish colour" .)

I've seen this clue in The Mirror, The Telegraph, the LA Times, The New York Times, The Star Tribune, the King Feature Syndicate, The Wall Street Journal, the Universal and the Penny Press.
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