Crossword Genius

Milky gemstone (4)

Ross

I believe the answer is:

opal

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">milky gemstone</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 "Delicately coloured gem" , "Iridescent quartz-like stone" , "Semi-transparent gem" , "Milky-white gemstone with flashes of colour" , "Type of gem" .)

I've seen this clue in The Wall Street Journal, The New York Times, the Penny Press, The Sun and the LA Times.
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