The Wittelsbach-Graff Diamond

The Wittelsbach-Graff Diamond is a 31.06-carat (6.212 g) deep-blue diamond with internally perfect clarity that was discovered in India's Kollur Mine. Laurence Graff paid £16.4 million for the Wittelsbach Diamond in 2008. Graff disclosed in 2010 that he had the diamond trimmed by three diamond cutters to correct flaws. The diamond was called the Wittelsbach-Graff Diamond after losing more than 4 carats (800 mg). There is some debate since opponents believe that the recutting has changed the diamond so much that it is no longer recognizable, jeopardizing its historical integrity.

The original Wittelsbach Diamond, also known as Der Blaue Wittelsbacher, was a 35.56-carat (7.112 g) fancy, deep, greyish-blue diamond with VS2 purity that was in both the Austrian and Bavarian Crown jewels.

This masterpiece, discovered as part of a larger collection, has become the heart and soul of The Jewelry House Privy Councillors. From every aspect, it changes and has more clarity than any other gemstone on the planet. For generations, its beauty has enthralled kings and queens. Clarity, shape, and color outperform them all, with five out of six attributes exceeding GIA industry standards.

Price: $23.4 million