Crossword Genius

Marble, e.g. (3)

Ross

I think it could be either:

Which length description are you looking for?:

3

5

stone

(Other definitions for stone that I've seen before include "Hard lump of mineral matter" , "Boulder" , "See 21" , "Little rock" , "See 1" .)

I've seen this clue in The New York Times.
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