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A green and pink tourmaline 'Three-legged toad' carving, 19th century. Photo Christie's Image Ltd 2014.

The stone is carved in the form of a three-legged toad holding a string with two coins in its mouth. The stone is of pale green and pink tones with some cloudy inclusions. 1 ¼ in. (3.2 cm.) wide. Estimate £5,000 – £8,000 ($8,405 - $13,448)

Christie's. FINE CHINESE CERAMICS AND WORKS OF ART, 13 May 2014, London, King Street - http://www.christies.com/