Mining company Gem Diamonds says it could be worth as much as half a billion rand.  mm

Gem Diamonds unearthed the D-colour stone at the Letseng mine in the mountain kingdom and described the 910-carat find as of exceptional quality.

The company’s  chief executive Clifford Elphick says.

this top quality diamond is the largest to be mined to date It’s  a landmark discovery.”

Mining analyst at Liberum Capital Ben Davis speculates in a research note to investors that the diamond could be worth as much as $40 million.

Gem Diamonds shares in London were up 14 percent from the market open to £0.92 a piece.

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