Crossword Genius

Gemstone (4)

Ross

'gemstone' is the definition.
(opal is a kind of gemstone)

This is the entire clue.

(Other definitions for opal that I've seen before include "Milky-white mineral" , "Iridescent gemstone" , "it may be highly valued" , "precious jewel" , "Translucent gemstone" .)

I've seen this clue in the Evening Standard, The Independent, the Penny Press, The Times, The Mirror, The Guardian and The Telegraph.
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