A 1,098 carat diamond believed to be the third largest gem-quality stone ever to be mined, has been discovered in Botswana, according to a joint venture between Anglo American's De Beers and the government. <br /><br />WATCH MORE: https://thestartv.com/c/news<br />SUBSCRIBE: https://cutt.ly/TheStar<br />LIKE: https://fb.com/TheStarOnline