An impressive cut-cornered rectangular-cut diamond ring, by Graff. Photo: Christie's Images Ltd., 2010

Set with a cut-cornered rectangular-cut diamond, weighing approximately 12.21 carats, the shoulders set with tapered baguette-cut diamonds, mounted in platinum. Signed Graff - Estimate $900,000 - $1,200,000. Price Realized $1,258,500

With report 10367297 dated 17 February 2010 from the Gemological Institute of America stating that the diamond is D color, VS1 clarity; accompanied by a working diagram indicating that the clarity may be potentially internally flawless

Christie's. Jewels: The New York Sale Including the JAR Imperial Topaz, Ruby and Diamond Ear Pendants, The Bulgari Blue, Jeweled Elegance & the Vanderbilt Diamond Necklace, 20 October 2010, New York, Rockefeller Plaza www.christies.com