Petra Diamonds’ sales rose 13% for the full fiscal year as the miner recovered a higher proportion of rough and sold goods it had held over from the previous period due to low demand. Revenue increased to $366 million for the 12 months that ended June 30, the company reported Tuesday. Sales volume grew 36% to 3.2 million carats. The company, which operates the Cullinan and Finsch mines in South Africa as well as the
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