Platinum and 5.27 carats Diamond Ring, Harry Winston. Estimate 150,000 — 200,000 USD . Photo: Sotheby's.

Centering a marquise-shaped diamond weighing 5.27 carats, flanked by tapered baguette diamonds weighing approximately .45 carat, size 5¼, with maker's mark for Jacques Timey.

Accompanied by GIA report no. 2171217267 stating that the diamond is D color, VS1 clarity. Together with the original working diagram stating that the diamond may be potentially internally flawless. 

Sotheby's. Important Jewels, New York, 24 sept. 2015