De Beers reportedly cut rough diamond prices in January, a rare retreat by the industry’s once-dominant broker as slumping demand, lab-grown stones and trade turmoil batter the global diamond market. The reduction, the company’s first since December 2024, came after months of quietly selling discounted stones while keeping official prices well above market levels, people familiar with the matter told Bloomberg News. At the first regular sale of the year on Monday, De Beers rolled out price cuts