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 Sunday Times, the Newsday, The Washington Post, The Wall Street Journal, The Times, The Mirror, the LA Times, the King Feature Syndicate, The Star Tribune, The New York Times, the Universal and the USA Today.
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