A huge diamond weighing more than 1,000 carats, which could be the third-largest mined in history, has been discovered in the southern African country of Botswana. The high-quality gemstone weighing 1,098.3 carats was unearthed earlier this month in the Jwaneng mine owned by Debswana, the mining company jointly owned by the Botswanan government and the De Beers Group. "With the recent introduction of a modern, state-of-the-art large diamond pilot plant, I have every hope that we will be able to recover more large diamonds," said Lynette Armstrong, Debswana's acting managing director. "This by