Crossword Genius

Gemstone (4)

Ross

'gemstone' is the definition.
(onyx is a kind of gemstone)

This is all the clue.

(Other definitions for onyx that I've seen before include "Kind of agate" , "Type of agate" , "Form of chalcedony" , "Striped agate" , "Quartz used as a gem" .)

I've seen this clue in The Independent, The Telegraph, The Guardian, the Evening Standard, The Times and The Mirror.
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