A diamond, emerald and natural pearl sautoir. Photo: Christie's Images Ltd 2012

Comprising one hundred and forty-five natural pearls, designed as a graduated strand spaced by emerald and rose-cut diamond beads, to the emerald and rose-cut diamond terminal and tassel, mounted in silver and gold, 34½ ins. Estimate $600,000 - $800,000. Price Realized $722,500

With report 62097 dated 10 February 2012 from the SSEF Swiss Gemmological Institute stating that the analysed properties confirm the authenticity of these saltwater natural pearls 

Christie's. Magnificent Jewels . 10 December 2012 New York, Rockefeller Plaza