Crossword Genius

Milky gem (4)

Ross

I believe the answer is:

opal

'milky gem' is the definition.
(I've seen this in another clue)

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 King Feature Syndicate, The Telegraph, The Mirror, the Penny Press, the LA Times, The New York Times, the Universal, The Wall Street Journal and The Star Tribune.
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