A magnificent platinum and diamond sautoir necklace with lavalliere pendant, Cartier New York, 1924. Photo Sotheby's

Designed as a series of openwork oval and bell-shaped links set with 13 old European-cut and cushion-shaped diamonds weighing approximately 37.75 carats, centering a larger cushion-shaped diamond weighing approximately 4.65 carats, supporting a lavalliere pendant set with 7 cushion-shaped and old European-cut diamonds weighing approximately 37.05 carats, length 15½ inches, signed Cartier, numbered 2419263; together with a length extender of a later date set with 13 cushion-shaped and old European-cut diamonds weighing approximately 22.30 carats, length 12¼ inches, separated into three segments, the necklace and length extender further set with smaller old mine and single-cut diamonds weighing approximately 18.60 carats.  Estimate 750,000-1,000,000 USD. Lot Sold: 1,650,500 USD

Accompanied by Certificate of Authenticity no. GE2011-131 from Cartier.

Sotheby's. Magnificent Jewels. New York | 07 Dec 2011 www.sothebys.com