Crossword Genius

Iridescent quartz gem (4)

Ross

I believe the answer is:

opal

(Other definitions for opal that I've seen before include "Milk-coloured gemstone" , "Milky-white gem" , "item in Hatton Garden?" , "it may be highly valued" , "Something milky-white" .)

I've seen this clue in the Sydney Morning Herald.
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