Purple gemstone (8)

I believe the answer is:

amethyst

'purple gemstone' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for amethyst that I've seen before include "what's in ring" , "Violet-coloured stone" , "Variety of quartz" , "Purple quartz, used as a gemstone" , "A Middle East language" .)

I've seen this clue in the Sydney Morning Herald and The Times.

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