Crystal object featured in Leonardo da Vinci's "Salvator Mundi," the most expensive painting ever sold (3)

I believe the answer is:

orb

(Other definitions for orb that I've seen before include "Poetically eye" , "A sphere or globe" , "Sphere - eye" , "Sphere for a sovereign" , "Sphere (found in regalia)" .)

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

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