Crossword Genius

Cameo stone (4)

Ross

I think it could be either:

opal

onyx

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

This is all the clue.

(Other definitions for onyx that I've seen before include "Smooth stone with bands of colour" , "precious stone" , "Hard stone with coloured layers" , "African antelope" , "material for making cameos" .)

I've seen this clue in the King Feature Syndicate and the Newsday.
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