Amethyst or turquoise (5)

I believe the answer is:

stone

I believe this clue is a double definition.

'amethyst' is the first definition.
(thesaurus)

'turquoise' is the second definition.
(thesaurus)

(Other definitions for stone that I've seen before include "Olive pip" , "Rock; cherry seed" , "See 19" , "Beryl, ruby" , "Hard lump of mineral matter" .)

I've seen this clue in the Universal, the Jonesin Crosswords and the Jonesin'.

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