A diamond ring. Photo Christie's Image Ltd 2012

Set with a modified square-cut diamond, weighing approximately 19.51 carats, to the circular-cut yellow diamond prongs with pear-shaped diamond detail, to the circular-cut diamond shoulders and hoop, mounted in yellow and white gold. Estimate $120,000 - $150,000. Price Realized $338,500 

With report 5151070570 dated 24 October 2012 from the Gemological Institute of America stating that the diamond is K color, VS2 clarity 

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