18 karat gold, green enamel, ruby and diamond frog bangle-bracelet, David Webb

The partially flexible bangle designed as a frog with 2 oval cabochon ruby eyes, the mouth set with 22 round diamonds, completed by a strap designed as intertwined legs clutching a cabochon ruby, the clasp further decorated with a cabochon ruby, applied throughout with translucent green enamel and studded with tiny gold knots, mounted in 18 karat gold and platinum, signed Webb. Est. 12,000—15,000 USD. Lot sold 21,250 USD

Sotheby's. Magnificent Jewels. 23 Apr 09. New York www.sothebys.com Photo courtesy Sotheby's