Way back in May, this year, two bidders battled for 15 minutes to buy this rectangular-shaped blue diamond. The final bid was A$11.63 million to an anonymous buyer. The stone set a record price per carat at the auction at Sotheby's and a new world record price for a blue diamond.
Petra Diamonds mined it from the Cullinan mine in South Africa where most of the world's blue diamonds, of size and quality come from. This stone was mined in 2008, cut in 2009, mounted in a platinum ring and sent straight to auction.
The anonymous buyer has been identified as Joseph Lau Luen-Hung and as the first owner, has the naming rights. The blue diamond will be known as the 'Star of Josephine', all 7.03 carats of it.