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

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FILE - In this May 16, 2010 file photo, Prince William holds Kate Middleton's hand with her engagement ring which once belonged to Diana, Princess of Wales, on the day their engagement was announced in London. Prince William revealed that he proposed using the engagement ring of his mother, Diana, Princess of Wales, to make sure Diana "didn't miss out on the excitement." Publicity surrounding the royal engagement ring sparked an interest among average consumers in adding gemstones like sapphires and rubies to their diamond engagement rings, according to Melissa Colgan, senior style editor of Martha Stewart Weddings. (AP Photo/Arthur Edwards, pool, File)
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