The price for the 34.65-carat diamond that sold at Christie's on Tuesday was the second-highest ever for a jewel sold at auction. The seller and buyer were anonymous.
The gem nicknamed the Princie Diamond was discovered 300 years ago in the Golconda mines in India.
It once belonged to the Nizam of Hyderabad, an Indian prince.
In 1960, the diamond was purchased at auction by the London branch of the jeweler Van Cleef & Arpels.
Its name was bestowed at a party at the firm's Paris store. It was called Princie in honor of the 14-year-old prince of Baroda, who attended the party with his mother, Maharani Sita Devi.
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