Crossword Genius

Stone in ring friend's put on (4)

Ross

I believe the answer is:

opal

'stone' is the definition.
(thesaurus)

'ring friend's put on' is the wordplay.
'ring' becomes 'o'.
'friend' becomes 'pal' (pal is a kind of friend).
'put on' says to put letters next to each other.
'o'+'pal'='OPAL'

'in' is the link.

(Other definitions for opal that I've seen before include "Lustrous stone" , "Delicately coloured gem" , "often semi-transparent" , "Mineral, usually iridescent" , "precious jewel" .)

I've seen this clue in The Telegraph.
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