The mining group Petra Diamonds has discovered a 507.55-carat white diamond at South Africa's Cullinan mine, one of the largest highquality rough diamonds ever found, the firm said yesterday.
"This spectacular gemstone was recovered on September 24 and is currently with experts for analysis," said a statement released by the London-listed company which operates mainly in Africa.
Initial examinations of the diamond which weighs just over 100 grams (3.5 ounces), have shown it to be of exceptional colour and clarity.
The diamond is currently undergoing colour grading, but it is believed to be a rare Type II diamond, with very low traces of nitrogen - considered an impurity - making such diamonds among the most transparent and colourless of the gems.
The precious stone was found alongside three other special white gems of similar colour and clarity, a large diamond of 168.00 carats and two other stones of 58.50 and 53.30 carats.
The mine is renowned for the discovery of the famed Cullinan Diamond in 1905.
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