Crossword Genius

Gem (4)

Ross

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4

5 7 9 8,5

'gem' is the definition.
(I know that opal is a type of opaque gem)

This is the entire clue.

(Other definitions for opal that I've seen before include "item in Hatton Garden?" , "Semi-precious stone of milky or bluish colour" , "Semi-transparent gem" , "Milky iridescent stone" , "Semiprecious stone of white and bluish colour" .)

I've seen this clue in The Independent, the Evening Standard, the Sydney Morning Herald and The Mirror.
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