Crossword Genius

Iridescent gemstone (4)

Ross

I believe the answer is:

opal

'iridescent gemstone' is the definition.
(I've seen this before)

This is all the clue.

(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 Wall Street Journal, the USA Today, the Universal, The Times and the King Feature Syndicate.
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