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