A 20-Carat Blue Diamond Is Sold for Almost $15 Million
The $15 million 20-carat blue gem. (Source: Petra Diamonds)

A 20-Carat Blue Diamond Is Sold for Almost $15 Million

(Bloomberg) -- Petra Diamonds Ltd. sold a 20-carat blue gem for almost $15 million, a major boost for the company that’s struggling with a mountain of debt and falling diamond prices.
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