An emerald and diamond ring, by Van Cleef & Arpels. Photo Christie's Image Ltd 2013

Set with an oval-cut emerald, weighing approximately 11.91 carats, within a circular-cut diamond surround, to the marquise and circular-cut diamond shoulders, mounted in 18k gold and platinum, with French assay mark. Signed Van Cleef & Arpels, no. 74394 (partially indistinct). Estimate $100,000 - $150,000. Price Realized $161,000

With report 13025086 dated 18 February 2013 from Gübelin Gem Lab stating that gemmological testing revealed characteristics consistent with those of emeralds originating from Colombia. Indications of minor clarity enhancement

Christie's. MAGNIFICENT JEWELS. 15 October 2013. New York, Rockefeller Plaza - www.christies.com