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When buying a diamond ring, learn the four C's

This publicity photo provided by Gemological Institute of America shows seven diamond cut shapes, from left to right: cushion, Asscher, emerald, modified radiant, oval, marquise, and pear. A simple round cut is the most common for modern diamond rings but some of the more unusual shapes, which have a retro look, are experiencing a resurgence, according to Melissa Colgan, senior style editor for Martha Stewart Weddings, because they are being seen on celebrities. (AP Photo/Gemological Institute of America)