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.
Princie Diamond
The Gemological Institute of America characterizes the Princie Diamond as fancy intense pink, natural color, VS2 clarity, Type IIa. The Princie diamond is at this time the largest Golconda-type fancy intense pink diamond ever to be graded at the Gemological Institute of America. The Princie also has the property that when exposed to ultraviolet light it displays bright orangey-red fluorescence. According to the Gemological Institute of America this kind of reaction to ultraviolet light is typical of diamonds of Indian origin. Of more than 7 million diamonds that have gone through the Gemological Institute of America's laboratory, no more than 40 exhibited this phenomenon and the Princie is the largest pink diamond that possesses it.