The Sotheby’s Magnificent Jewels sale achieved £23.5m this month, with rare gemstones and white diamonds in high demand ...

He says the unusual skill has helped him identify rare finds ... out how much money he has lost paying for gems which shouldn't have been up for sale in the first place. “I don't think there's ...

It is one of the rarest gemstones on Earth ... 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 father of more ...