Cullinan Diamond
The Cullinan Diamond is the largest gem-quality rough diamond ever found, weighing , 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.
Khwaja Alimullah
The 26-carat (5.2 g) oblong table-shaped diamond is largest and most precious jewel stone in Bangladesh. It is believed to be quarried in a south Indian mine, like the Koh-i-Noor. It is set in the centre of a gold armlet, with ten 5-carat (1 g) oval shaped smaller diamonds around it, used by the Nawabs of Dhaka, who also used as it an ornament on the turban. It is now preserved in a vault of Sonali Bank.