Prior to being cut, the Cullinan Diamond was approximately how many carats?

The Cullinan Diamond is the largest gem-quality rough diamond ever found, weighing 3,106.75 carats (621.35 g), discovered at the Premier No. 2 mine in Cullinan, modern-day South Africa, on 26 January 1905. It was named after the chairman of the mine, Thomas Cullinan.

It was presented to King Edward VII of the United Kingdom for his 66th birthday and 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 (109.13 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 part of the Crown Jewels which belong to the monarch in right of the Crown.

Seven other major diamonds cut from the original weighing a total of 208.29 carats (41.66 g) are privately owned by Queen Elizabeth II, who inherited them from her grandmother, Queen Mary, in 1953 along with ninety-six minor stones.