An Art Deco emerald and diamond necklace, by Cartier. Photo Christie's Image Ltd 2012

Designed as a central row of rectangular cut-cornered emeralds, graduated in size within an articulated brilliant-cut diamond collet border, to flanking baguette-cut diamond geometric openwork panels suspended from the further twin-row diamond collet back chain, with pavé diamond bevelled clasp, circa 1935, 43.4cm long. Signed Cartier London and indistinctly no.8834. Estimate £80,000 - £100,000. Price Realized £169,250 ($272,323)

Accompanied by report no.06719 dated 23 November 2012 from The Gem & Pearl Laboratory, London, stating a random sample of the emeralds are natural, with no evidence of clarity enhancement to moderate evidence of clarity enhancement, origin Colombia except one - third emerald from tongue end 

Christie's. Important Jewels. 12 December 2012. London, King Street