A colored diamond ring. Photo Christie's Image Ltd 2013

Set with a circular-cut fancy greenish gray diamond, weighing approximately 8.48 carats, in a backed yellow gold setting, within a circular-cut yellow diamond surround, to the circular-cut diamond bifurcated shoulders and half hoop, mounted in 18k gold and platinum. Estimate $10,000 – $15,000

With report 2145851816 dated 23 July 2012 from the Gemological Institute of America stating that the diamond is fancy greenish gray, natural color 

Christie's. NEW YORK MAGNIFICENT JEWELS AND THE PRINCIE DIAMOND. 16 April 2013. New York, Rockefeller Plaza.