It's the cr?me de la cr?me from one of The Stones (5)

I believe the answer is:

jewel

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'of the stones' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand the rest of the clue.

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(Other definitions for jewel that I've seen before include "(Semi) precious stone" , "Precious stone or mineral" , "The - That Was Ours (Dexter)" , "Gem" , "Gemstone" .)

I've seen this clue in The Irish Times.

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