A 163.41-carat D-color flawless diamond sold for $33.7 million at Christie’s Magnificent Jewels sale in Geneva Tuesday. Known as the “Art of de Grisogono, Creation 1,” the rectangular shaped ...

Christie’s is selling what it says is the largest D-color flawless diamond to ever come to auction, a 163.41-carat emerald-cut gem owned by the Geneva-based luxury jeweler, De Grisogono.