TheCullinan Diamondwas a large gem-quality diamond weighing 3,106.75 carats (621.35 g) discovered at the Premier No. 2 mine outside Pretoria, South Africa, on 26 January 1905. It was named after the chairman of the mine, Thomas Cullinan.
It was cut into several polished gems, the largest of which is named Cullinan I or the Great Star of Africa, and at 530.4 carats (106.08 g) it is the largest clear cut diamond in the world.
It was the largest polished diamond of any colour until the discovery in 1985 of the Golden Jubilee Diamond (545.67 carats (109.134 g)), also from the Premier Mine. Cullinan I is mounted in the head of the Sovereign’s Sceptre with Cross. The second-largest is Cullinan II or the Second Star of Africa; at 317.4 carats (63.48 g) it is the fourth-largest cut diamond in the world, and is mounted in the Imperial State Crown. Both diamonds are in the Crown Jewels.
