South Africa's Petra Diamonds, Ltd. has found diamond the size of a chicken egg at the country's Cullinan mine northeast of Pretoria.
The diamond, discovered Thursday, might be one of the world's top 20 high-quality gems, The New York Times reported.
The company's chief executive, Johan Dippenaar, said in a Tuesday statement that the 507.55-carat gem was of “exceptional color and clarity.”
The diamond weighs over 100 grams and has not been valued yet.
The world's largest diamond was also found at the Cullinan mine. It was 3,106 carats when uncut and its polished version was used in Britain's Imperial Scepter as part of the Crown Jewels.
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