Magnificent platinum and diamond ring, Harry Winston. Photo Sotheby's

The marquise-shaped diamond weighing 13.05 carats, flanked by two tapered baguette diamonds weighing approximately .80 carat, size 4¼, fitted with inner sizing spheres, stamped HW for Harry Winston. With signed box. Estimation 1,000,000 — 1,500,000 USD

Accompanied by GIA report no. 2155497057 stating that the diamond is D color, VVS2 clarity. Together with the original working diagram stating that the diamond is potentially Flawless. Additionally with a letter from the GIA stating that the diamond has been determined to be Type lla. 

Sotheby's. Magnificent Jewels. New York | 11 déc. 2013 - www.sothebys.com