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How can you tell a real diamond?

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You can tell if your rock is the genuine thing by fogging it up like a mirror. When it stays fogged for 3-4 seconds or longer, it's really a fake. A real diamond would clear quickly. Keep in mind, though, for this test work, you have to be sure that your diamond is completely clean and free from oil or dirt. read more

While various tests can be used to tell if a diamond is real, it’s advised to have a professional diamond expert assist you in determining if a diamond is genuine. A professional gemologist who has a Graduate Gemologist (GG) degree will be able to tell you definitively if a diamond is real or not. read more

Even if you know the jewelry you have contains diamonds, it can pay off to take them to a gemologist to know how much they're actually worth. "Say you have five, 1-carat diamonds on the table — the cut, color, and clarity will be a huge factor in why one is worth $800 and one is worth $10,000," she said. read more

If you have an unmounted stone you know to be either CZ or real diamond, place both rocks in your hand and bounce them gently, you should be able to immediately tell which is the heavier cubic zirconia and which is the lighter diamond. read more