Crossword Genius

It's the stone in a ring, mate (4)

Ross

I believe the answer is:

opal

'it's the stone' is the definition.
(gemstone)

'ring mate' is the wordplay.
'ring' becomes 'o' (letter resembling a ring).
'mate' becomes 'pal' (I've seen this before).
'o'+'pal'='OPAL'

'in a' is the link.

(Other definitions for opal that I've seen before include "Milky-white gemstone with flashes of colour" , "One's stony" , "Precious stone" , "often semi-transparent" , "Precious stuff" .)

I've seen this clue in the Evening Standard.
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