Crossword Genius

Oyster's gem (5)

Ross

I believe the answer is:

pearl

'oyster's gem' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for pearl that I've seen before include "Gem; an attacked Harbor" , "piece of wisdom" , "Oyster growth" , "Small type" , "Much loved and valued person" .)

I've seen this clue in The New York Times, The Mirror, the Evening Standard and the Universal.
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