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.
Pink Panther jewel
The Darya-ye Noor diamond is believed to be the largest pink diamond in the world. The stone is estimated to weigh 175 and 195 carats and is a light pink color. Its exact weight is unknown because it has been mounted in its brooch setting for over 130 years. The stone is part of the Iranian Crown Jewels and is displayed at the Central Bank of Iran in Tehran.