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Diamonds’ Best Winning Run in Two Years Is Probably Over Already

  • Underlying problems mean gems unlikely to break seasonal mold
  • Demand soft on curbs in credit, weak China, Russia, MidEast

Diamonds’ longest winning streak in two years has probably run its course.

Rough-gem prices are up almost 10 percent this year, rising for four straight months on improved U.S. demand and output cuts by the two main producers.