A colored diamond and diamond ring. Photo Christie's Image Ltd 2014

Set with a cut-cornered rectangular-cut fancy yellow diamond, weighing approximately 19.82 carats, flanked on either side by a trapeze-cut diamond, to the circular-cut diamond surround and half-hoop, mounted in platinum and 18k gold. Estimate $450,000 – $550,000

With report 1152789645 dated 21 November 2013 from the Gemological Institute of America stating that the diamond is fancy yellow, natural color, VVS2 clarity 

Christie's. IMPORTANT JEWELS,10 June 2014, New York, Rockefeller Plaza - http://www.christies.com/