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The Ballon Bleu de Cartier wristwatch combines Cartier’s signature jewelry designs and intricate watchmaking techniques. Launched in 2007, the Ballon Bleu de Cartier is a favorite among celebrities and royals such as Kate Middleton. The Ballon Bleu gets its name from its two prominent features: the blue sapphire cabochon set on the crown, which appears to be floating, and the balloon-shaped case. The upcoming Intervendue auction presents an 18-karat pink gold case Ballon Bleu de Cartier watch. The self-winding mechanical movement wristwatch has a silvered guilloché lacquered opaline dial and blued-steel sword-shaped hands. Along with the signature floating sapphire crystal, the watch has a black alligator-skin strap.

Also featured are examples of Victorian jewelry. The Victorian era revived several ancient jewelry styles, such as the Etruscan, and launched new ones, such as Art Nouveau. Showcased in the sale is a Victorian 18-karat gold, diamond, and peridot pendant, as well as a gold and tourmaline necklace. Also offered is jewelry by Tiffany & Co., Cartier, Pomellato, Van Cleef & Arpels, and timepieces by Jaeger Lecoultre, Patek Philippe, Audemars Piguet, and Bulgari. Interested collectors can explore the full listings and register to bid online on Bidsquare.