Petra Blue Diamond to be Auctioned by Sotheby’s

Fancy vivid blue, IF 7.03 ct, cushion cut diamond expected to fetch up to $8.5 million

Sotheby’s upcoming Sotheby’s sale of Magnificent Jewels will include a rare fancy vivid blue, internally flawless, cushion-shaped diamond weighing 7.03 carats. The diamond was cut from the 26.58 carat rough stone discovered in 2008 at Petra Diamonds’ Cullinan diamond mine in South Africa. 

The pre-sale estimate is $5.8 to 8.5 million.

At a weight of 7.03 carats, the diamond ranks among the most important blue diamonds ever to be offered for sale by Sotheby’s. Blue diamonds, which are among the rarest of all gems, owe their color to the presence of the chemical element boron during the stone’s formation.

The Cullinan mine is the world’s most consistently reliable source of blue diamonds and this stone is a perfect example of Cullinan diamonds at their best. 

The diamond will be exhibited in Hong Kong, Paris, New York and London ahead of the May 12 sale in Geneva.