The five blue diamonds recovered from the Cullinan Mine over the course of the same week in September are, from left to right, 9.61, 11.42, 17.57, 21.25, and 25.75 carats. (Photo courtesy of Petra Diamonds)
The diamond miner has inked a partnership with Antwerp-based cutter HB Group to buy all its diamonds weighing more than 10.8 carats for the rest of 2020.
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