London — De Beers is planning to spend more money advertising diamonds than any time in the past decade to win back wealthy shoppers. The company, a unit of Anglo American, boosted its marketing budget to $140m this year, the most since 2008, according to a statement on Tuesday. Its three biggest markets, the US, China and India, will be the main focus, the company said. Diamonds face tougher competition as an elite status symbol among millennials as young, rich shoppers spend more cash on high-end electronics, travel and fine dining. While De Beers said spending on diamond jewelry in the past five years was a record, the company is also battling a years-long slump in prices for polished gems. "We cannot take future growth for granted," said Stephen Lussier, head of marketing at De Beers. "Increasing our spend from a strong position will help support continued demand in both mature and developing markets, particularly among millennials." De Beers is trying to rectify a contraction i...

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