Crossword Genius

Whitish gemstone (4)

Ross

I believe the answer is:

opal

'whitish gemstone' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for opal that I've seen before include "item in Hatton Garden?" , "what may be set in 29 [DIAL]" , "Many-coloured gem" , "Jewellery item" , "Semi-precious stone of b;uish white colour" .)

I've seen this clue in the Newsday.
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