The World’s Biggest Rough Diamond

The World’s Biggest Rough Diamond


Considered the most expensive rough diamond in the world, The Constellation was found in November 2015 in Botswana, Africa by the Canadian miner Lucara Diamond.

Earlier this year, in an auction led by Sotheby’s in Dubai, the stone was sold by astonishing US$ 63 million, the highest price ever paid for a rough diamond. The buyer was the Russian jeweler De Grisogono, who intends to transform the stone into a magnificent piece by the hands of designer and founder of the brand, Fawaz Gruosi.

The announcement of the transaction was done during the opening of the Biennale des Antiquaires antique show in Paris.

The stone weights 813 carats and measures 6 centimeters (2.4 inches) across.

The purchase represents a ground-breaking moment for the company in its journey to become one of the world’s leading high jewellery and watch brands.



“(This is) the first time we’ve taken such a historic stone and had full creative freedom to do what we want with it,” said de Grisogono CEO John Leitao in Paris, adding that the brand planned to transform Constellation into “a stone that rivals the crown jewels.”

De Grisogono founder Fawaz Gruosi, recognized as the creative visionary behind the brand, referred to the stone alternately as his “princess,” “his collaborator” and “his woman.” But he admits their relationship can be complicated.

“I love her and I hate her,” he said. “Love because something like this is so exceptional — I could never dream to be able to have a stone like this in my own hands — and hate her because I don’t know how I’m going to dress her.”

Though the two maintain a constant dialogue (“I keep talking to her, asking what clothes she would like to wear”), Gruosi predicts it will be six to eight months before de Grisogono unveils the finished stone.



The Constellation naturally boasts the colour, clarity and carat weighting of an internationally and historically significant stone. It is expected that the cutting process, due to be completed by the middle of 2017, may unveil one of the world’s largest certified flawless diamond.


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