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.
Philippe II, Duke of Orléans
On 6 June 1717, under the influence of Law and the duc de Saint-Simon, the Regent persuaded the Regency Council to purchase from Thomas Pitt for £135,000 the world's then largest known diamond, a 141 carat (28.2 g) cushion brilliant, for the crown jewels of France. The diamond was known from then on as "Le Régent".