A green tourmaline, turquoise and diamond 'salamander' brooch, Jean Schlumberger, Tiffany & Co. Photo courtesy Bonhams.

 the textured gold body enhanced by rectangular-cut green tourmalines, with circular-cut diamond feet and cabochon turquoise eyes, extending a polished gold tongue; signed Tiffany for Tiffany & Co., Schlumberger; mounted in eighteen karat gold and platinum; length: 2 3/8in. Estimate: US$ 5,000 - 7,000 (€3,700 - 5,200) (£3,100 - 4,400)