Crossword Genius

Ring mate to get a stone (4)

Ross

I believe the answer is:

opal

'a 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'

'to get' is the link.

(Other definitions for opal that I've seen before include "Iridescent gemstone" , "Iridescent quartz-like stone" , "Quartz-like gemstone" , "Milky stuff that's hard" , "Type of gemstone" .)

I've seen this clue in The Mirror.
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