Crossword Genius

Gem's special quality (5)


I believe the answer is:


'gem's' is the definition.

'special quality' is the wordplay.
'special' becomes 's' (common abbreviation as in Special Air Service).
'quality' becomes 'tone' ('tone' can be a synonym of 'quality').

(Other definitions for stone that I've seen before include "Rag" , "Piece of rock - weight" , "Small rock" , "Little rock" , "Beryl, ruby" .)

I've seen this clue in The Independent.
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