Antique French Jet Bead Necklace Circa. 1910 American Although the beads look like jet, they are actually french jet with a matte finish. 48 inch endless necklace. No clasp. Newly re-strung with each bead hand-knotted. Barrel-shaped french jet beads, measuring 5/8" x 1/4" each. 62.1 gr. 39.9 dwt.