Petra Diamonds/ho / EPA
Petra Diamonds Chief Executive Johan Dippenaar holds a white diamond weighing 507.55 carats, which was excavated at the historic Cullinan mine in South Africa on Sept. 24, 2009.
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Petra Diamonds Chief Executive Johan Dippenaar holds a white diamond weighing 507.55 carats, which was excavated at the historic Cullinan mine in South Africa on Sept. 24, 2009.
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