jeweler's_glass has definitions from the field of optics
[ noun ] (optics) an optical instrument used by jewelers; has one or more lenses and is used to view features not readily seen

Used in print

(Jay Williams, The Forger....)

George did wonderful complicated pen-and-ink drawings like something out of a medieval miniature : hundreds of delicate details crammed into an eight by ten sheet and looking as if they had been done under a jeweler's_glass .

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