Miners in Lesotho have discovered a huge gem stone which may become the largest ever polished round diamond. The stone weighs 478 carats and is the 20th largest rough diamond ever found, said Gem Diamonds.The company said the uncut rock was recovered recently from the Letseng mine, owned by the company in Lesotho.
The diamond, which is as yet unnamed, has the potential to yield a 150 carat cut stone, and could sell for tens of millions of dollars, the company said.