Crossword Genius

Opal, e.g. (3)

Ross

I believe the answer is:

gem

(Other definitions for gem that I've seen before include "Emerald or sapphire, say" , "A jewel or precious stone" , "Treasured person" , "Kindness; comfort (German)" , "perfect specimen" .)

I've seen this clue in the Penny Press.
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