A Christian pastor in Sierra Leone has discovered one of the world\u2019s largest uncut diamonds.\r\n\r\n\r\n\r\nThe 709-carat stone was found by Emmanuel Momoh in the Kono district. He handed it to to a local chief who then passed it on to Sierra Leone's president Ernest Bai Koroma.\r\n\r\nThe diamond is now locked up in the country\u2019s central bank in the capital Freetown.\r\n\r\nA statement from the president thanked the chief and his people for not smuggling the diamond out of the country. He said he understood the importance of selling such a diamond in the country as it will \u201cclearly\u201d benefit the country as a whole.\r\n\r\nThe government plans to auction the precious stone and said the selling process would be \u201ctransparent\u201d. \r\n\r\nThe diamond has not yet been valued but it is the biggest diamond to be found in Sierra Leone since 1972, when the 969-carat Star of Sierra Leone was dug up. It is believed to be the 13th largest diamond ever found. \r\n\r\nLast May, diamond-mining firm Lucara sold a 813-carat stone for $63m (\u00a351m) at a closed auction in London.