Marble, e.g. (3)

I think it could be either:

Which length description are you looking for?:

orb

(Other definitions for orb that I've seen before include "Sphere - eye" , "A poetic eye, bro" , "Item of royal regalia" , "Jewelled ornament" , "Spherical object or shape" .)

I've seen this clue in The Washington Post, The New York Times, the L.A. Times Daily and the King Feature Syndicate.

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