A  17.62 carats rectangular-cut diamond ring

Set with a rectangular-cut diamond, weighing approximately 17.62 carats, to the graduated square-cut diamond bifurcated shoulders and hoop, mounted in platinum. est. $600,000 - $800,000 - Sold $722,500

With report 17472431 dated 25 July 2008 from the Gemological Institute of America stating that the diamond is H color, VVS2 clarity

Christie's. Jewels: The New York Sale. 22 April 2009. New York, Rockefeller Plaza www.christies.com Photo: Christie's Images Ltd 2009