Crossword Genius

Cameo gemstone (4)

Ross

I believe the answer is:

onyx

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

This is the entire clue.

(Other definitions for onyx that I've seen before include "Stone-like marble with different colours in layers" , "Stone-like marble with coloured layers" , "Striped agate" , "Agate with alternating bands of colour" , "Form of quartz" .)

I've seen this clue in The Sun.
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