Platinum and diamond ring. Photo Sotheby's 

The modified cushion-shaped diamond weighing 17.73 carats, flanked by bullet-shaped diamonds weighing approximately 1.40 carats, size 7¼. ESTIMATE 250,000-300,000 USD

NOTE: Accompanied by GIA report no. 2145043857 stating that the diamond is J color, VS1 clarity; with original working diagram stating that the diamond is potentially flawless.

Sotheby's. Important Jewels, New York | 09 Feb 2012 www.sothebys.com