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.
Red diamond
Red diamonds are known for their small sizes. The majority of red diamonds on the market are less than 1 carat in weight. Only 5 red diamonds are known to exceed 5 carats in weight, the largest being 5.11 carats. Only a handful of red diamonds are discovered on an annual basis throughout the world, and most of them do not exceed 1 carat. Red diamonds are priced per carat, as all diamonds, and their per carat price is 300–400% higher than the per carat prices of the next most expensive diamonds, pink diamonds and blue diamonds.