The Cullinan Diamond is the largest gem-quality rough diamond ever found, weighing 3,106.75 carats (621.35 g) (21.9 ounces), (1.37 pounds) 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. In April 1905, it was put on sale in London, but despite considerable interest, it was still unsold after two years. In 1907, the Transvaal Colony government bought the Cullinan and Prime Minister Louis Botha presented it to Edward VII, King of the United Kingdom, who had it cut by Joseph Asscher & Co. in Amsterdam. Cullinan produced stones of various cuts and sizes, the largest of which is named Cullinan I or the Great Star of Africa, and at 530.4 carats (106.08 g) (3.74 ounces) it is the largest clear cut diamond in the world. The stone is mounted in the head of the Sovereign’s Sceptre with Cross. The second-largest is Cullinan II or the Second Star of Africa, weighing 317.4 carats (63.48 g), mounted in the Imperial State Crown. Both are part of the Crown Jewels. Seven other major diamonds, weighing a total of 208.29 carats (41.66 g), are privately owned by Elizabeth II, who inherited them from her grandmother, Queen Mary, in 1953. The Queen also owns minor brilliants and a set of unpolished fragments.
Cullinan produced 9 major stones of 1,055.89 carats (211.178 g) in total, plus 96 minor brilliants and some unpolished fragments weighing 19.5 carats (3.90 g). All but the two largest stones – Cullinans I and II – remained in Amsterdam by arrangement as the fee for Asscher’s services, until the South African government bought them (except Cullinan VI, which Edward VII had purchased and given to his wife Queen Alexandra in 1907), and the High Commissioner for Southern Africa presented them to Queen Mary on 28 June 1910. Mary also inherited Cullinan VI from Alexandra, and she left all her Cullinan diamonds to her granddaughter Elizabeth II in 1953. Cullinans I and II are part of the Crown Jewels, which belong to the Queen in right of the Crown.
