The Billion Dollar Business of Diamonds, From Mining to Retail
Aug 27, 2012 . Like the gold business, the diamond business is segmented into several groups: . Cutters and polishers: those who buy rough diamonds from the producers, . Australia, Angola, Namibia and Canada make up most of the rest. . In the U.S., it costs about $100 a carat to cut a diamond; in India, it costs $10.
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