A small-scale miner in Tanzania, Saniniu Laizer (52), has become an overnight millionaire after selling two huge Tanzanite stones, which together weigh 15kg (33lb) at $3.4 million.
He was congratulated the president of the country, John Mugufuli and hopes to build a shopping mall and a school.
Mr Mugufuli said through a phone call to Mr Laizer that it is the benefit of small-scale mining, which proves that Tanzania is rich.
The two gemstones weigh 9.2kg and 5.8kg – the largest Tanzanite rocks ever mined, as the largest rough Tanzanite stone on record weighed 3.38kg. It was mined by TanzaniteOne in 2005.
Mr Laizer, from Manyara in northern Tanzania did not disclose when unearthed the gems but he sold them to the government on Wednesday.
The deal was sealed through the mining ministry for a total of 7.8bn Tanzanian shillings ($3.4m; £2.7m).
Mr Laizer he planned to hold a party at home for friends and family where he would slaughter a cow to celebrate his extraordinary find.
Tanzanite is one of the rarest gemstones on earth and, according to the University of Pennsylvania, one local geologist estimates its supply may be entirely depleted within the next 20 years