A 13.72 carats rectangular-cut G color, VVS2  diamond ring. Estimate $400,000 – $600,000. Photo Christie's Image Ltd 2015

Set with a rectangular-cut diamond, weighing approximately 13.72 carats, flanked on either side by a triangular-cut diamond, mounted in platinum

With report 5074824 dated 13 April 2015 from the Gemological Institute of America stating that the diamond is G color, VVS2 clarity; accompanied by a working diagram indicating that the clarity of the diamond may be potentially Internally Flawless 

The magnificent jewels of Margaret Adderley Kelly

Christie's. IMPORTANT JEWELS, 16 June 2015, New York, Rockefeller Plaza