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  2. May 31, 2024 · A real diamond reflects white light extremely well, providing exceptional sparkle. Diamonds also reflect colored light, or fire, in magnificent fashion. If you compare a real diamond to a fake diamond like Cubic Zirconia, you are able to notice a drastic difference in the white and colored light sparkle that the real diamond gives off.

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    • Testing Mounted Diamonds. Use the fog test. Put the stone in front of your mouth and fog it like you would a mirror. If it stays fogged for a couple seconds, it’s probably a fake — a real diamond disperses the heat from your breath instantaneously and won't fog up easily.
    • Testing Unmounted Diamonds. Look at the stone's refractivity. Diamonds sharply bend, or refract, the light that passes through them, resulting in their strikingly brilliant appearance.
    • Testing Professionally. Ask for a heat probe test. The tight, evenly-packed crystalline structure of diamonds makes them disperse heat quickly; thus, real diamonds will not heat up easily.
    • Telling Natural Diamonds from Other Stones. Recognize synthetic diamonds. Lab-created or synthetic diamonds are "real" but they are not "natural".
    • 2 min
    • Thermal Test (The Best Test to Spot a Fake Diamond!) In this video, FAKE and REAL shows you how to use a diamond detector! Video licensed under Creative Commons.
    • Facet Doubling. What You'll Need. A jeweler's loupe or magnifying glass and some patience. How to Check for Facet Doubling. For this test, take the loupe and examine the stone closely.
    • UV Fluorescence. What You'll Need. A blacklight. How to Check for Fluorescence. In a dark room, shine the blacklight on your gem and see if it fluoresces.
    • Newspaper/Dot Test. What You'll Need. A newspaper or a piece of paper with a small dot drawn on it. This test is only appropriate for loose gems, not set ones.
  3. 2 days ago · A real diamond will sink to the bottom because of its high density. Fake diamonds or lighter stones may float or sink more slowly. While this isn’t a definitive test, it can tell you whether your diamond is real or fake. The Scratch Test. Diamonds are the hardest known natural material, ranking a 10 on the Mohs hardness scale.

    • The fog test. Diamonds are excellent thermal conductors. They allow heat to pass through them rapidly. If you blow on a diamond as if you are trying to fog a window, the fog will dissipate from a real diamond almost instantly.
    • The water test. Real diamonds are incredibly dense and will sink in water. For this test, all you need is a glass of water. Fill a drinking glass with tap water and drop your stone in the glass.
    • Look for clues on the gem and setting. If the diamond you want to test is already set in jewelry, the setting – or even the gem itself — can offer some valuable clues.
    • The ultraviolet light test. If you have an ultraviolet (UV) light, it can provide some clues about whether you have a real diamond or a fake. Many (but not all) real diamonds will glow blue under UV light.
  4. Whether beneath the trained eye of an expert, or simply the adoring eye of an enthusiast, one thing is certain: a fake cannot and will never come close to the sparkle of a real diamond. The Diamond Expert has prepared an ultimate guide on how to tell if a diamond is real or fake.

  5. Apr 12, 2023 · How can you tell if your diamond is real or fake? That's the topic of today's guide. Specifically you'll learn: 10 different easy (and fast) tests to check if your diamond is real; The #1 best fake diamond test; What to look out for during these tests; And much more

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