Platinum, diamond and baroque cultured pearl necklace. Photo courtesy Sotheby's.

Composed of 35 baroque cultured pearls measuring approximately 18.9 to 12.4 mm, the trefoil-shaped clasp set with three old European-cut diamonds, the largest weighing 3.92 carats, the other two weighing approximately 2.85 and 2.70 carats, framed by round and single-cut diamonds weighing approximately 1.25 carats, length 21½ inches, the clasp numbered 15421, with French assay and workshop marks; the clasp circa 1920. Estimation 40,000 — 60,000 USD