76-carat diamond nets a record $21.5M

In this May 2, 2012, photo, an employee shows the Beau Sancy diamond, 34.98 carat, at Sotheby's auction house in Zurich, Switzerland. In May, Sotheby's sold the Beau Sancy diamond to an anonymous bidder for $9.7 million. Marie de Medici had wore it at her coronation as Queen Consort of Henry IV in France in 1610. Then the diamond passed among the royal families in France, England, Prussia and the Netherlands. It was sold by the Royal House of Prussia.

Credit: AP Photo/Alessandro Della Bella