De Beers’ prices fell last year as a prolonged oversupply in the midstream and economic challenges weighed on demand. The company’s rough-price index, which reflects like-for-like values, dropped 6% for the 12-month period, parent company Anglo American reported last week. Sales volume slipped 19% to 27.4 million carats, with the average selling price sliding 25% to $147 per carat. While the company has not published its full-year revenue, rough sales decreased 36% to $3.63 billion,
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