The
Cullinan Diamond was a large gem-quality diamond weighing discovered at the Premier No. 2 mine outside
Pretoria, South Africa, on 26 January 1905. It was cut into several polished gems, the largest of which is named
Cullinan I or the
Great Star of Africa, and at it is the largest polished white diamond in the world. It was the largest polished diamond of any colour until the discovery in 1985 of the
Golden Jubilee Diamond , also from the
Premier Mine. Cullinan I is mounted in the head of the
Sovereign's Sceptre with Cross. The second-largest gem from the rough stone,
Cullinan II or the
Second Star of Africa, at , is the fourth-largest polished diamond in the world, and is mounted in the
Imperial State Crown. Both diamonds are in the
Crown Jewels, which are part of the
Royal Collection held in trust by Queen Elizabeth II for her successors and the nation. Seven other diamonds cut from the original belong to the Queen personally.