A Tanzanian miner and a father of 30 children has become a millionaire overnight after digging up two big chunks of one of the world's rarest gemstones worth $3.35million.  

The Tanzanian government gave Mr. Saniniu Laizer a cheque for 7.74 billion Tanzanian shillings ($3.35million) for the two dark violet-blue stones during a trading event in the northern region of Manyara on Wednesday, 24th June 

He discovered the rarest gemstones which weighed 9.2kg and 5.8kg in the north of the country last week. 

The father of 30 children who has four wives vowed to use some of the money to build a school and a shopping mall in his community, where many parents didn't  afford to pay for their children's educational fee.   

President John Magufuli  phoned to congratulate Laizer live on television during the presentation of his cheque.

'This is a confirmation that Tanzania is rich,' Magufuli told minerals minister Doto Biteko.