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.
Jewels of the Nizams
There are 173 jewels, which includes emeralds weighing nearly , and pearls exceeding 40,000 chows. The collection includes gemstones, turban ornaments, necklaces and pendants, belts and buckles, earrings, armbands, bangles and bracelets, anklets, cufflinks and buttons, watch chains, and rings, toe rings, and nose rings. Among them is the seven-stringed Basrah pearl necklace, known as Satlada, which has 465 pearls embedded in it. One of the prized possessions in the collection is the Jacob Diamond, the fifth largest diamond in the world weighing 184.75 carats, which was found by the last Nizam, Osman Ali Khan, in the toe of his father’s shoe at Chowmahalla Palace and he himself used it as a paper weight for a long time.