Cullinan Diamond
The Cullinan Diamond is the largest gem-quality rough diamond ever found, weighing , discovered at the Premier No. 2 mine in Cullinan, South Africa, on 26 January 1905. It was named after Thomas Cullinan, the mine's chairman.
Oppenheimer Diamond
The Oppenheimer Diamond, a nearly perfectly formed yellow diamond crystal, is one of the largest uncut diamonds in the world, and measures approximately 20 × 20 millimeters. It was discovered in the Dutoitspan Mine, Kimberley, South Africa, in 1964. Harry Winston acquired the stone and presented it to the Smithsonian Institution in memory of Sir Ernest Oppenheimer.