Cullinan Diamond
The Cullinan diamond was found below the surface at Premier Mine in Cullinan, Transvaal Colony, by Frederick Wells, surface manager at the mine, on 26 January 1905. It was approximately long, wide, deep, and weighed . Newspapers called it the "Cullinan Diamond", a reference to Sir Thomas Cullinan, who opened the mine in 1902. It was three times the size of the Excelsior Diamond, found in 1893 at Jagersfontein Mine, weighing . Four of its eight surfaces were smooth, indicating that it once had been part of a much larger stone broken up by natural forces. It had a blue-white hue and contained a small pocket of air, which at certain angles produced a rainbow, or Newton's rings.
Nizam Diamond
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Nizam Diamond is believed to have been the most famous diamond in the 1800s. It is named after its original owner HEH Mir Osman Ali Khan, the last Nizam of Hyderabad. There are tales about its size, around . The story goes back to the rulers of Golconda, and is believed to have been found at Kollur Mine. The precious stone gets its name from the Prince Nizam of Hyderabad.