Lab-grown diamond prices slide as De Beers fights back
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LONDON (Reuters) - Since De Beers abandoned its decades-old policy of refusing to sell lab-grown diamonds as jewellery, the price gap between man-made stones and natural gems has widened - and the difference is set to get even bigger.When De Beers shocked the industry with its U-turn in May, a 1 carat synthetic diamond cost about $4,200 (3,321 pounds) while an equivalent mined gem sold for $6,000. But since September, De Beers, has been selling gem-quality man-made stones for just $800 a..