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

Designed as a coiled snake, the sprung body applied with coral, onyx and diamond scales, the head with pear-shaped diamond eyes and hinged jaw opening to reveal the circular dial with baton and dot hour markers, within a diamond bezel, mechanical movement, in brown leather Bulgari case. Signed Bvlgari, case no. 585307A 

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