Crossword Genius

Milky-white gemstone (4)

Ross

I believe the answer is:

opal

'milky-white gemstone' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for opal that I've seen before include "Jewellery item" , "Precious stone" , "Iridescent quartz-like stone" , "Translucent gem" , "Quartz-like gemstone" .)

I've seen this clue in the Newsday and The Guardian.
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