Largest Diamond:

The world’s largest diamond was named as 'Cullinan', found in South Africa in 1905. It weighed 3,106.75 carats uncut. It was cut into the 'Great Star of Africa', weighing 530.2 carats, the 'Lesser Star of Africa', which weighs 317.40 carats, and some more diamonds, all of nearly flawless color and clarity. 

They now form part of the British crown jewels!