After the reported discovery of the world's second biggest diamond in Botswana, a massive 2,492-carat stone by Canadian mining company Lucara, here are other famous diamond discoveries ...

Botswana, a country of 2.6 million people in southern Africa, is the second-biggest producer of natural diamonds behind Russia and has unearthed all of the world's biggest stones in recent years.

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 Thursday.