Crossword Genius

Iridescent gemstone (4)

Ross

I believe the answer is:

opal

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

(Other definitions for opal that I've seen before include "Milky stuff that's hard" , "Lustrous stone" , "Precious stone" , "Type of gemstone" , "Iridescent gemstone" .)

I've seen this clue in The Guardian, The Wall Street Journal, The Times, the King Feature Syndicate, the Universal and the USA Today.
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