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Why De Beers makes 'not for sale' diamonds

These diamonds help it make machines to distinguish synthetic stones from real gems

While synthetic diamonds make up just a fraction of the market, they have growing appeal to younger buyers. Retailers sell man-made gems at discounts of 30 per cent to 40 per cent.


SCIENTISTS at De Beers can make near-flawless diamonds in a lab, but they will never sell you one. The 127-year-old mining company's Element Six unit, named for the carbon atom's rank on the periodic table, makes gems that are as perfect as any found at Tiffany & Co stores, yet