Crossword Genius

October birthstone (4)

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">october birthstone</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for opal that I've seen before include "Something milky-white" , "Translucent gem" , "Iridescent gemstone" , "Variegated gemstone" , "Milky-white gemstone with flashes of colour" .)

I've seen this clue in The Washington Post, the Universal, The Star Tribune, the USA Today, the Newsday, the LA Times, the King Feature Syndicate, The Wall Street Journal, The Sunday Times, The Times, The Mirror and The New York Times.
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