Petra Diamonds Recovers Rare 25.5-Carat Blue Diamond
By Erika Winters Petra Diamonds announced the recovery of a rare 25.5-carat rough blue diamond at the Cullinan mine in South Africa. The high-quality diamond is considered top color and is among a number of blue diamonds produced--including a 26.6-carat rough stone that yielded a 7.0-carat fancy-vivi...
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