A "perfect" 100-carat diamond sold for $22.1 million within three minutes of bidding starting on Tuesday evening, making it the most expensive colorless diamond ever auctioned in New York.
The large emerald-cut jewel was described as "an internally flawless, type IIa stone"—one of the purest and most valuable type of diamonds—and was the main attraction of the 370 lots on sale in Sotheby's "Magnificent Jewels" auction.
Ahead of the auction, the diamond was seen fetching between $19 million and $25 million.
The winning bidder took part in the auction via telephone and wanted to remain anonymous, Sotheby's said.
According to the Sotheby's, only six "perfect" diamonds weighing over 100 carats have sold at auction in the last 25 years.