The largest diamond in the world was the Cullinan, which is a 3,106-carat diamond. The diamond weighed 1.33 pounds and was discovered on Jan. 25, 1905 in Pretoria, South Africa. The Cullinan diamond was later broken into nine large stones, and 100 smaller stones.
The Cullinan was given to Britain's King Edward VII as a birthday present. The largest stone cut from the Cullinan was the "Star of Africa" or "Cullinan I," which is the largest-cut, fine-quality diamond in the world at 530 carats. The second-largest stone cut from the Cullinan was the "Star of Africa II" or Cullinan II, which is 317 carats. These stones are displayed in the Tower of London.