They're not called 'black diamonds' because they're pretty. But truffles count among the most expensive delicacies in the world. Guy Clavel asks: when you order that high-priced dish at that high-browed restaurant, is that a real truffle on your plate or a very clever fake?
As is true for all diamonds, buyers of 'black diamonds', a.k.a truffles, are being cautioned to beware of fakes.
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