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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.
    • Test Your Diamond With the Scratch Test. Supplies you'll need for this diamond test: Mirror or sandpaper. The scratch test used to be the primary method to determine if you stone is a real diamond.
    • Check If Your Diamond Is Fake With the Fog Test. Supplies you'll need for this diamond test: Your breath. Tweezers (optional) You can do the fog test at home with a mounted or unmounted stone.
    • The Newspaper / Dot Test to Find Fake Diamonds. Supplies you'll need for this diamond test: Newspaper/Paper. Pen. While originally done with a newspaper, you can perform this test with just a plain piece of paper.
    • Check If a Diamond Is Real With the Water Test. Supplies you'll need: Glass. Water. The water test is a simple test to perform, but it only works if you have a loose stone.
  3. Jul 27, 2020 · A quick and easy way to tell if your diamond is real or not — put the stone in front of your mouth and fog it up with your breath. If it clears up after a second or two, then it's real, but if karat stays fogged for three seconds or more, then you're looking at a fake.

    • Cheryl Roberts
  4. Can you tell if a diamond is a real with your naked eye? A real diamond’s refractivity means that it sparkles brilliantly under intense light. If you compare a real diamond and a fake material like cubic zirconia, it should be obvious which stone is real.

  5. 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.

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