Diamonds were once a girl's best friend, according to Marilyn Monroe in the 1953 classic film Gentlemen Prefer Blondes.But these days, for environmentally conscious customers, lab-grown gems seem to be preferred over mined rock, with celebrities such as , and showing off lab-created accessories.The boom of lab-grown rocks has upset traditional mining firms such as Anglo American, the owner of De Beers, the world's leading diamond company, according to .
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