The high jewellery piece features a magnificent 163.41-carat diamond at its centre and is touring the world’s major cities before its sale in Geneva. Dubai Showcases Unique Creation I Diamond Necklace By De GRISOGONO. Christie's, Christie's Auction, DE GRISOGONO, DE GRISOGONO HIGH JEWELLERY, Diamonds, Fawaz Gruosi, High Jewellery, THE ART OF DE GRISOGONO. Watches & Jewellery.