Tiffany & Co., Jean Schlumberger amethyst, diamond, and ruby Bird on a Rock brooch that’s estimated to achieve between $20,000 and $30,000 in Christie’s Jewels Online sale.

Made for Tiffany & Co. by Jean Schlumberger, this diamond 36 Stone bracelet carries a presale estimate of $10,000 to $15,000.

Jean Schlumberger for Tiffany & Co. yellow gold and platinum brooch set with round diamonds.

This bird brooch by Jean Schlumberger for Tiffany & Co. is made with a coral cabochon and round diamonds with 18k yellow and white gold.

Jean Schlumberger for Tiffany & Co. 18k-yellow gold, platinum, and diamond brooch.

Tiffany & Co., Jean Schlumberger turquoise and gold brooch included in Christie’s upcoming Jewels Online sale.

This Jean Schlumberger for Tiffany & Co. Peapod brooch features cultured pearls approximately three to eight mm in size, set in 18k yellow gold, and bears the Pierre Brun maker’s mark.

Tiffany & Co., Jean Schlumberger Five Leaves 18k-yellow gold and platinum brooch set with approximately 200 round diamonds.

These Tiffany & Co., Jean Schlumberger 18k-yellow gold earrings included in the online sale at Christie’s feature approximately 1.9 karats of round diamonds.

This Tiffany & Co., Jean Schlumberger Flames yellow gold and platinum brooch is set with 90 round diamonds.

Ibex brooch by Jean Schlumberger for Tiffany & Co., consisting of round diamonds and a pear-shaped ruby set in 18k yellow gold and platinum, is presumed to bring $6,000 to $8,000 in Christie’s Jewels Online sale.

Tiffany & Co., Jean Schlumberger camel brooch features diamonds, oval-shaped pink sapphire, lapis lazuli cabochon, and cultured pearl, set in 18k yellow and white gold is estimated to achieve between $7,000 and $10,000 in Christie’s upcoming Jewels Online sale.

18k yellow gold and platinum bracelet with 51 round diamonds, made by Jean Schlumberger for Tiffany & Co.

Tiffany & Co., Jean Schlumberger gold bracelet has approximately 211 round diamonds for a total of 6.5 karats.

Tiffany & Co., Jean Schlumberger citrine and diamond Bird on a Rock brooch that’s estimated to achieve between $12,000 and $18,000 in Christie’s Jewels Online sale.

Tiffany & Co., Jean Schlumberger green paillonné enamel and gold Cones and Vs bangle bracelet, estimated to fetch between $12,000 and $18,000 in Christie’s Jewels Online auction running through September 30.

Gold necklace by Jean Schlumberger for Tiffany & Co. included in Christie’s Jewels Online sale, running through September 30.

This Croisillon bangle black enamel and 18k-gold bracelet by Jean Schlumberger for Tiffany & Co. carries a pre-sale estimate of $10,000 to $15,000.