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 in 1905 and was cut into nine separate stones, many of which now form part of the British crown jewels.
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