Crossword Genius

Milky gem (4)

Ross

I believe the answer is:

opal

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">milky gem</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

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