A jadeite, ruby and diamond 'serpenti' watch-bracelet, by Bulgari. Estimate CHF145,000 – CHF190,000 ($146,058 - $191,387). Photo Christie's Image Ltd 2015

Designed as a coiled dragon, the sprung body of naturalistic design applied with marquise-cut diamond clusters, to the pavé-set diamond and cabochon jadeite crest and tail, with ruby eyes, the hinged jaw opening to reveal the circular dial with baton hour markers, within a diamond surround, mechanical movement, mounted in gold and silver, in red leather Bulgari case. Signed Bvlgari, dial signed Piaget 

Notes: Cf. A. Triossi, 'Between Eternity and History, BVLGARI, from 1884 to 2009, 125 Years of Italian Jewels', Milan, Skira, 2009, pp. 194-195, for illustration and drawing of similar models 

Christie's. GENEVA MAGNIFICENT JEWELS, 10 November 2015, Geneva