A tsavorite garnet, red spinel, diamond and cushion-shaped red tourmaline bangle, by De Grisogono. Estimate CHF29,000 – CHF48,000 ($29,212 - $48,350). Photo Christie's Image Ltd 2015

Designed as a hinged coiled snake, the body set with circular-cut tsavorite garnet and red spinel, the eyes as two marquise-cut diamonds, the head crowned with a cushion-shaped red tourmaline, the articulated tail pavé-set with diamonds, inner circumference 18.0 cm, mounted in gold. Signed de Grisogono 

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