Lot 134. Barbara Sinatra’s 20.60 carats D VVS1 Type IIa Diamond Enagement Ring. Estimate 1,000,000 — 1,500,000 USD. Lot sold 1,695,000 USD. ©  Sotheby's.

Centering an emerald-cut diamond weighing 20.60 carats, flanked by two triangular-shaped diamonds, size 5¾.

Accompanied by GIA report no. 2195301718 stating that the diamond is D color, VVS1 clarity. Together with a letter from the GIA stating that the diamond has been determined to be Type IIa.

Sotheby's. Magnificent Jewels, New York, 4 december 2018