Jeweler

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Middle English: from Old French juelier, from joel (see jewel).

wiktionary

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From Middle English jueler, from Anglo-Norman jueler, or Old French juelier.

etymonline

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jeweler (n.)

also jeweller, late 14c. (mid-14c. as a surname, Alice la Jueler), from Anglo-French jueler, juelleor, Old French juelier, juelior (Modern French joaillier), from joel "a jewel" (see jewel).