On Thursday 24 September, Mining group Petra Diamonds has discovered a 507.55 carat white diamondat South Africa’s Cullinan mine, one of the largest high-quality rough diamonds ever found. 

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 undergoing colour grading, but is believed to be a rare Type II diamond,



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