From Middle English dyamaunt, from Old French diamant, from Late Latin diamas, from Latin adamas, from Ancient Greek ἀδάμας ("diamond"). Cognate with Spanish imán ("magnet") and diamante, French aimant ("magnet") and diamant, Italian diamante, and Portuguese ímã ("magnet") and diamante.
Borrowed from Dutch diamant, used by Dirck Voskens who first cut it around 1700, presumably naming it by analogy with the larger Perl.
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