Valentine’s Day probably won’t be enough to perk up diamond demand that’s been slowing as the U.S. economy cooled. Global imports of the precious stones have tracked the country’s growth since at least 2004, according to data from Kimberly Process, which records and certifies rough-diamond shipments. Americans will spend $4.4 billion buying jewelry for loved ones this Valentine’s Day, down 8 percent from last year, data from the National Retail Federation show.
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