Crossword Genius

Gemstones (5)

Ross

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5

6 8 9

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

This is all the clue.

(Other definitions for opals that I've seen before include "jewellery" , "Iridescent gems" , "Semi-precious stones of milky or bluish colour" , "Milky white and coloured gems" , "Milky sparkling gemstones" .)

I've seen this clue in The Times, The Mirror and The Telegraph.
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