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.
Tiffany Yellow Diamond
The gem was on loan from Tiffany & Co. to the Smithsonian National Museum of Natural History in Washington D.C. and was on display from April 18, 2007 until September 23, 2007. At the time, Jeffrey E. Post, the museum`s gem curator, said that this was the largest diamond on display in the U.S. The famous Hope Diamond is only 45.5 carats, which is about one-third the mass of the Tiffany Yellow Diamond.