A flawless vivid blue diamond weighing 7.03 carats sold Tuesday for a record 10.5 million Swiss francs ($9.49 million), the highest price paid per carat for any gemstone at auction, Sotheby's said. The rectangular-shaped blue stone, the rarest to enter the international market this year, went to an anonymous buyer bidding by telephone after hectic bidding see-sawed between two callers for 15 minutes. It was the centrepiece of its semi-annual sale in Geneva, conducted by David Bennett, chairman of Sotheby's jewelry department in Europe and the Middle East, who said the results showed the market's resilience despite the economic downturn. The final price includes a commission paid by the buyer to the auction house. The stone sets a record price per carat for any gemstone sold at auction of $1,349,752, Sotheby's said. The previous record price for a fancy vivid blue diamond was $7.9 million, including commission, for a stone weighing 6.04 carats at sale in Hong Kong in October 2007, also by Sotheby's. The new owner will have the right to name the stone, which is mounted in a platinum ring.
