A South African mining company claimed to have discovered the world’s largest diamond, which is double the size of the current biggest known stone, the Cullinan.

Brett Jolly, a spokesman for the company, Two Point Five Construction, said the rough diamond - reportedly a 7,000-carat stone about the size of a coconut - had been transported under tight security to Johannesburg and deposited in a bank vault.

New Delhi: United Progressive Alliance (UPA) chairperson Sonia Gandhi will visit