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.
Alexander Pushkin (diamond)
The Alexander Pushkin () is a 320.65 carat colorless raw diamond, the second largest gem diamond ever found in Russia or the territory of the former USSR (after the 26th Congress of the CPSU), and one of the largest in the world as of 2016. It was mined at the Udachnaya kimberlitic pipe (Yakutia, Far Eastern Federal District) in December 1989 and named after the world-famous Russian writer Alexander Pushkin. It is kept in the Russian Diamond Fund (Moscow Kremlin.)