Crossword Genius

Banded gemstone (4)

Ross

I think it could be either:

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4

5

onyx

'banded gemstone' 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 "Form of chalcedony" , "Stone-like marble with different colours in layers" , "Black variety of quartz" , "Quartz with alternating bands of colour" , "Chalcedony agate" .)

I've seen this clue in the LA Times, the Universal and The Independent.
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