An 18ct White Gold Diamond and Coloured Diamond Pendant, by Theo Fennell. Photo: Christie's Images Ltd 2012

Modelled as a pavé black diamond serpent entwined within a brilliant-cut diamond-set openwork heart, mounted in 18ct white gold, 6.6cm long, black diamonds not tested for natural colour origin, London hallmark. Signed Fennell - Estimate £5,000 - £7,000

Christie's. Jewellery. 5 September 2012. London, South Kensington