You can't tell... (Score 1)

You CANNOT tell the difference between a well cut cubic zirconia and a real diamond with the naked eye. Even experts are fooled. "A few years back, ABC's 20/20 News team took a high intensity CZ, as well as a perfect $50,000,000 mined diamond to the New York Diamond District. After an expert meticulously scrutinized the two stones, he announced confidently that BOTH stones were counterfeit!" http://www.allsands.com/Fashion/cubiczirconiad_xfv _gn.htm