Crossword Genius

‘Finally About Us' from The Rolling Stones (4)

Ross

I believe the answer is:

gems

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'stones' is the definition.
(precious stones)

I don't understand the remainder of the clue.

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(Other definitions for gems that I've seen before include "Jewels" , "Valuable stones" , "Precious stones" .)

I've seen this clue in The Guardian.
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