(Newser)
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A giant diamond experts believe ranks among the top 20 gems ever found has been unearthed at a South African mine. The egg-sized, 500-carat sparkler was found at the same mine where the biggest diamond in history, the Cullinan, was found in the 19th century. The diamond is being analyzed and is expected to be worth over $20 million when it's cut and polished.
