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Douglas Harper's Etymology Dictionary
esclavage

chain or bead necklace worn by women and popular mid-18c., 1758, from French esclavage, literally "slavery" (16c.), from esclave (13c.) "slave" (see slave (n.)). So called from fancied resemblance to a slave's neck chains.

Wiktionary
esclavage

n. a type of chain or bead necklace.