In this photo supplied by Petra Diamonds CEO Johan Dippenaar, ...
CP
Tue Sep 29, 5:24 PM
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In this photo supplied by Petra Diamonds CEO Johan Dippenaar, holds the 507.55 carat white diamond recovered at the Cullinan Diamond Mine, South Africa, on Sept. 24, 2009. Petra Diamonds Ltd. says a diamond the size of a chicken egg has been found at South Africa's Cullinan mine. The diamond may be among the world's top 20 high-quality gems. It was discovered Thursday, Sept. 24, 2009 at the mine northeast of Pretoria, South Africa.

(AP Photo/Petra Diamonds) **NO SALES**

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