Botswana uncovers huge 2,492-carat diamond that could be one of the biggest ever

A person holds a 2,492-carat diamond which was found in Botswana (AP)

The largest diamond found in more than a century has been unearthed at a mine in Botswana, and the country’s president showed off the fist-sized stone to the world at a viewing ceremony.

The Botswana government says the huge 2,492-carat diamond is the second-biggest ever discovered in a mine.