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.
Alexander Malcolm Jacob
He is best known for having sold the Jacob Diamond, which is the seventh largest diamond known in the world (previously known as the Victoria Diamond, Imperial Diamond, or Great White Diamond). It was owned by the Nizam of Hyderabad and is currently owned by the Government of India.