The Cullinan Diamond is still the largest diamond of all time. Which weighed 3,106.75 carats. It was discovered on January 23, 1905 at the Premier No. 2 mine in Cullinan, South Africa. It was named after Thomas Cullinan, the mine’s chairman. In 1907, Cullinan was purchased by the Transvaal colony government, and presented by Prime Minister Louis Botha to King Edward VII of the United Kingdom, who cut it by Joseph Ascher & Co. of Amsterdam.