Lot 357. A Spectacular 100.20 carats D color and Internally Flawless clarity Emerald-Cut Type lla Diamond. Estimate $19,000,000 — 25,000,000  (17,268,175 - 22,721,283 EUR). Lot sold 22,090,000 USD. Photo: Sotheby's

The emerald-cut diamond weighing 100.20 carats, mounted in platinum, size 6½. 

Accompanied by a GIA monograph.

Accompanied by GIA report no. 5161435897 stating that the diamond is D color, Internally Flawless. Together with a letter from the GIA stating that the diamond has been determined to be Type lla.

Courtesy of the GIA Monograph.

The present stone during the cutting and polishing process.

The present stone during the cutting and polishing process.

A sketch of the present stone mounted as a pendant-necklace.

A sketch of the present stone mounted as a cuff-bracelet.

Sotheby's. Magnificent Jewels, New York, 21 avr. 2015, 10:00 AM