A diamond pendant necklace, by Graff. Photo: Christie's Images Ltd 2012

Set with a marquise-cut diamond, weighing approximately 10.97 carats, to the fine link neckchain, mounted in platinum, 17¾ ins., in a Graff navy leather case. Signed Graff. Estimate $1,000,000 - $1,500,000. Price Realized $1,172,500

With report 11499621 dated 10 October 2012 from the Gemological Institute of America stating that the diamond is D color, internally flawless clarity 

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