Diamond, say

I believe the answer is:

gemstone

'diamond say' is the definition.
(diamond is a kind of gemstone)

This is all the clue.

(Other definitions for gemstone that I've seen before include "[RUBY] , for example" , "Emerald or ruby" , "Jewel" , "Piece of crystalline rock as jewellery" , "Physical power" .)

I've seen this clue in The Daily Mail.

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