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A 9.75-carat fancy vivid blue diamond from the collection of Mrs. Paul Mellon sold for more than $32.6 million, shattering its high estimate of $15 million at Sotheby’s New York Thursday. The price set a world auction record for any blue diamond; and at more than $3.3 million per carat, it set a world auction record for price-per-carat for any diamond.

The pear-shaped diamond was sought after by seven bidders who competed for 20 minutes for the gem, Sotheby’s said. It ultimately sold to a Hong Kong private collector who named it “The Zoe Diamond.”

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A flawless fancy vivid pink diamond sold for a record $17.7 million in Hong Kong late Tuesday, Sotheby's said.

The auction house said the internally flawless 8.41-carat stone had been expected to go under the hammer for up to $15.5 million.

Quek Chin Yeow, deputy chairman of Sotheby's Asia, said the pear-shaped stone had "attracted keen competition before fetching a wonderful price of HK$137.88 million (US$17.77 million) and setting a world auction record for a fancy vivid pink diamond."

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