De Beers, the world's largest producer of rough diamonds, said prices had increased an average of 16 percent since the beginning of the year. The company's Diamond Trading Company arm, which handles about 40 percent of the world's supply of diamonds by value, said that the strongest cumulative price increases had been in rough stones that produce diamonds greater than one carat when polished. The company provides price adjustment information three times a year, ahead of its annual results and in advance of trade shows in Las Vegas and Hong Kong.
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