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