Beryl's weight? (5)

I believe the answer is:

stone

I believe this is a double definition.

'beryl's' is the first definition.
(thesaurus)

'weight?' is the second definition.
(stone is a kind of weight)

(Other definitions for stone that I've seen before include "that one will 26d at 8a [FLING at HIGHLAND GAMES]" , "Endocarp" , "Small rock" , "diamond, say" , "Little rock" .)

I've seen this clue in the Evening Standard.

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