The Cullinan Diamond is the largest gem-quality rough diamond ever found, weighing 3,106.75 carats, discovered at the Premier No.2 mine in Cullinan, South Africa,

“Due to its immense value, detectives were assigned to a steamboat that was rumoured to be carrying the stone, and a parcel was ceremoniously locked in the captain's safe and guarded on the entire journey. It was a diversionary tactic – the stone on that ship was fake, meant to attract those who would be interested in stealing it. Cullinan was sent to the United Kingdom in a plain box via registered post”