76-carat stone sells in auction for record price Perfectly transparent On Tuesday night, Christie's auctioned off the Archduke Joseph Diamond for $21,474,525 including commission, a world auction record price per carat for a colorless diamond. That was well above the expected $15 million and more than triple the price paid for it at auction almost two decades ago. The 76.02-carat diamond, with perfect color and internally flawless clarity, came from the ancient Golconda mines in India. 76-carat diamond nets a record $21.5M The seller, Alfredo J. Molina, chairman of California-based jeweler Black, Starr & Frost, said immediately afterward that there were two main bidders and that he was delighted with the result. Molina said the winning bidder, who wished to remain anonymous, is going to donate the diamond for display at a museum. "It's a great price for a stone of this quality," Molina told The Associated Press. It's one of a kind, so it's like saying 'Are you pleased when you sell the Mona Lisa?' Or 'Are you pleased when you sell the Hope Diamond?' It's all what the market will bear, and the stone sold for a very serious price. Named for Archduke Joseph August of Austria, the great-grandson of both a Holy Roman emperor and a French king, the diamond passed to his son, Archduke Joseph Francis, who put it in a bank vault, then to an anonymous buyer who kept it in a safe during World War II. From there it surfaced at a London auction in 1961, then at a Geneva auction in 1993, when Christie's sold it for $6.5 million. It wasn't the only mega-diamond to go under the hammer at Tuesday's auction in the hotel room packed with well-heeled bidders. Beneath a row of three enormous chandeliers that cast panther-like shadows on the ceiling, the participants eagerly pounced at the jewels while competing with bidders from around the world calling in to Christie's employees seated in rows on both sides of the room. But perhaps the buyers weren't entirely immune to the harsh financial climate in Europe - or at least some Geneva version of it. Two plus-sized diamonds did not sell Tuesday night. A yellow diamond with 70.19 carats failed to sell because the final bid was 2.8 million Swiss francs, just slightly below the reserve price. A 12.16 carat pink diamond didn't sell because the final bid was 1.8 million francs, well under the reserve price. Fancy deep blue Also on the block: a conch pearl, enamel and diamond Cartier bracelet that formerly belonged to Queen Victoria Eugenia of Spain that's expected to sell for up to $1.4 million. Royal connections Pear-shaped Heart-shaped Intensely pink