It is one of the rarest gemstones on Earth ... Mr Laizer in June at an auction where he sold two Tanzanite rocks for $3.4m After his June sale of two rocks weighing 9.2kg and 5.8kg, Mr Laizer ...

A small-scale miner in Tanzania has become an overnight millionaire after selling two rough Tanzanite stones - the biggest ever find in the country. Saniniu Laizer earned £2.4m ($3.4m ...