The Masters of the Diamond World Are Losing Control
A finished round-shaped diamond, left, and an uncut diamond with cutting marks are displayed in this arranged photograph in Gaborone, Botswana. (Photographer: Chris Ratcliffe/Bloomberg)

The Masters of the Diamond World Are Losing Control

(Bloomberg) -- For decades, shopping for uncut diamonds was a tightly scripted affair: First, persuade De Beers to add you to its list of handpicked customers. Then, 10 times a year, attend a week-...
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