Diamond, perhaps? It is real, surprisingly, set around ring (9)
I believe the answer is:
solitaire
'diamond' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
(Other definitions for solitaire that I've seen before include "[PATIENCE], especially in America" , "American singer" , "One-gem ring; one-player game" , "Single stone in jewellery" , "Bond girl" .)