A multi-gem, diamond and gold brooch, by Jean Schlumberger. photo: Christie's Images Ltd 2010

Designed as a floral cluster, set with pear, cushion and oval-cut amethysts, interspersed with sculpted gold blossoms, each centering upon a variously shaped peridot or yellow sapphire, with collet-set diamond accents, mounted in yellow and white gold, circa 1950, in a Schlumberger Inc. black velvet fitted case. Signed Schlumberger Inc. for Jean Schlumberger. Est. $10,000 - $15,000 - Price Realised $37,500

A multi-gem, gold and enamel "Dauphin" brooch, by Jean Schlumberger, Tiffany & Co.

Designed as a circular-cut peridot and cabochon turquoise body with bezel-set cabochon ruby eyes, a polished gold head, tail and fins, holding a red enamel starfish, mounted in gold, 1960. Signed Tiffany, Schlumberger. Est. $12,000 - $15,000 - Price Realised $30,000

A set of enamel and gold jewelry, by Jean Schlumberger, Tiffany & Co.

Comprising a bracelet, designed as a green pailloné enamel hinged bangle, decorated with sculpted 18k gold vertical bands and "X" motif detail; and a pair of ear clips, each designed as a green pailloné enamel and 18k gold bombé half hoop, enhanced by gold half boules and linear detail, mounted in 18k gold, with French exportation marks and maker's marks, bracelet 2 1/8 ins. diameter, ½ in. width. Each signed Tiffany, Schlumberger. Est. $8,000 - $12,000 - Price Realised $11,875

Christie's. Jewels: The New York Sale, with The Catherine the Great Emerald Brooch and The Emperor Maximilian Diamond. 22 April 2010. New York, Rockefeller Plaza www.christies.com