Bijou

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French, from Breton bizou ‘finger ring’, from biz ‘finger’.

wiktionary

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Borrowed from French bijou.

Borrowed from Sabir bijou, ultimately from Occitan pichon(“small, little”), influenced by English bijou(“jewel”). [1]

etymonline

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bijou (n.)

"small item of ornamental jewelry," 1660s, from French bijou, which according to OED is probably from Breton bizou "(jeweled) ring," from bez "finger" (compare Cornish bisou "finger-ring," 13c.). Related: Bijouterie.