Codognato. A spectacular rubellite, tourmaline, diamond and coloured diamond skull ring, by A. Codagnato. Photo Philips de Pury & Co

Designed as a grinning skull entwined by pavé-set diamond and coloured diamond snakes, the head set to the centre with a cabochon rubellite tourmaline to diamond crystal eyes, ring size L, c. 1970, signed ‘A. Codagnato’.  ESTIMATE £10,000-15,000 - SOLD AT £12,500
Philips de Pury & Co. Jewels. 1 june 2011. London