De Grisogono threw a lavish party yesterday on the sidelines of the Cannes Film Festival and showed off a giant 404-carat diamond worth $20 million which the jeweller plans to turn into something very special.

The party was held under the theme ‘Folies in Cannes’ at the Hotel du Cap-Eden-Roc at the Cap d'Antibes in France.

It attracted a host of stars and A-listers including Kim Kardashian, Milla Jovovich, Bella Hadid, Robert De Niro, Grace Hightower, Paris Hilton, Toni Garn, Amy Jackson, Chanel Iman, Chris Tucker, Kris Jenner, Natasha Poly, Mischa Barton, Gregory Van Der Weil, Hailey Clauson, Valeria Golino and Harvey Weinstein.

Following an Elie Saab fashion show, de Grisogono founder Fawaz Gruosi unveiled the 404-carat rough diamond which is said to be the largest found to date in Angola.

The Swiss luxury jeweller is entrusted with the cutting of the stone under a partnership with Dubai-based diamond trader Nemesis International, which recently acquired the diamond for a reported $20 million.

Following the invite-only dinner, around 650 guests attended the after-party and were entertained by the legendary Goldsingers, alongside performances by the AI McKay Allstars, DJ Jack E and DJ Willy.