Miners unearth second biggest diamond ever in Botswana

The second biggest diamond ever found - a rough 2,492-carat stone - has been unearthed in Botswana thanks to specialist X-ray technology. The gem, uncovered by Canadian mining firm Lucara, is the largest diamond seen in the last 120 years since the discovery of the world-famous Cullinan Diamond. The 3,106-carat stone was found in neighbouring South Africa in 1905 and was cut into nine separate stones, many of which now form part of the British crown jewels. It is not known whether the latest diamond to be discovered will yield...