An Art Deco Diamond, Emerald and Onyx Ring. Photo: Christie's Images Ltd 2012

The old brilliant-cut diamond millegrain-set within a hexagonal surround set with rows of calibré-cut emeralds and onyx, between old-cut diamond three stone shoulders, circa 1925, finger size L - Estimate £4,000 - £5,000

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