Found in 1905 in South Africa…literally just sitting idly around on the rock face of a mine 9 meters underground and excavated with a pocket knife. Its size was 3106 carats, and when divided up, it created 9 major diamonds, 96 smaller ones and additional pieces totalling 9.5 carats. What happened to it? Well it was given to the Royal Family as a birthday present and has remained with them in their crown jewels since. Why this name? Well, It was named after the individual, Sir Thomas Cullinan who actually owned the mined. Another interesting fact about it, it is thought the superintendent who found it, actually broke off a chunk for himself which was almost just as big as the one he handed in. Never proven but theorised that the diamond was actually a lot larger than what was reported!