Coming in at #1 in price and #1 in controversy is the Wittelsbach-Graff diamond. This piece started out its life as a 35.56-carat deep blue diamond which found its way into both the Austrian and Bavarian Crown Jewels. In 2008, London jeweller Laurence Graff bought the stone for $23.4 million and immediately went about altering it. In a move that infuriated other jewellers, Graff removed nearly 4.5 carats from the blue diamond which actually ended up enhancing its clarity and value. In 2011, it was reported that Graff has sold the Wittelsbach-Graff diamond to a member of the Qatari royal family for $80 million.