To tell if a diamond is real, use at-home methods like the fog test (real diamonds clear instantly), the water test (real ones sink), the dot test (real ones obscure the dot), and the sparkle test (real ones show brilliance with gray and rainbow flashes). Professional methods include thermal testers and lab reports for definitive results, but generally, real diamonds have sharp facets, excellent brilliance, and unique light refraction, unlike fakes (cubic zirconia, glass) which often look dull or overly colorful.
This one's easy: Get a glass and fill it with water (it doesn't matter what type of water you use). Drop the diamond into the glass of water. Due to the high density of diamond, when dropped into water a real diamond will sink. If the diamond floats to the top or middle of the glass, it's fake. It's simple physics.
Mobile apps may mimic testing, but they can't match the accuracy of professional instruments. Your phone won't replace a professional appraisal, but it can assist. Use the flashlight to observe how the stone handles light. A real diamond will produce sharp flashes and concentrated brilliance.
View It Through a Loupe
Hold the loupe up to the gemstone, and look for imperfections. Remember, small flaws are natural and often indicate that the stone is real. Look for subtle color gradations, tiny mineral fragments within the stone, and other natural imperfections. If your diamond is flawless, it's probably fake.
Flashlight Test
To tell if a diamond is real with a flashlight, observe how the stone refracts light. Shine a flashlight directly at the diamond. A real diamond will reflect white light brilliantly, while a fake stone may not reflect as intensely or at all.
The Aquamarine name comes from the Latin word for seawater and is said to calm waves and keep sailors safe at sea. It is sometimes referred to as a poor man's diamond because of the pale color.
Brilliance vs. Fire: Diamonds show balanced white light reflection with some color dispersion; CZ displays more rainbow effects and less white brilliance. Flawless Appearance: CZ typically lacks the tiny natural inclusions present in almost all diamonds.
To determine a diamond's authenticity using a mirror, observe the mirror reflection test. Genuine diamonds display unique reflective quality, lack surface scratches, show no fogging effect, and their mirror symmetry highlights their real, unmatched brilliance.
Real diamonds don't fog up as long. If you take the stone and breathe on it—whether it's real or fake—it will fog up, just like a mirror. The difference, however, is in how long the fog lasts on the stone's surface. With real diamonds, the fog will disappear quickly because diamonds conduct heat.
Can fake diamonds pass diamond tester? Yes, some diamond simulants can pass a diamond tester. For example, moissanite, a man made gem, may pass as a diamond on a standard tester pen.
Pure diamond is not magnetic.
Place the gemstones in a glass of water and watch. If it floats, then it is probably a fake stone. Real diamonds will sink to the bottom of the glass, while cubic zirconia will float to the surface.
Buying a diamond starts by understanding the unique characteristics of each stone. After all, no two diamonds are the same. To help you make sense of shopping for these timeless gems, diamonds are graded based off the 4Cs - cut, color, clarity, and carat weight. The 4Cs of diamonds impact a stone's beauty and value.
Carat is the unit of measurement for the physical weight of diamonds. One carat equals 0.200 grams or 1/5 gram and is subdivided into 100 points. For comparison, in units more familiar in the United States, one carat equals 0.007 ounce avoirdupois.
6. Do Real Diamonds Sparkle? Two other quick and simple ways to spot a real diamond is by looking at how it sparkles in light and how much you can see through it. A real diamond appears gray and white inside (brilliance) when held to the light and can reflect rainbow colors (fire) onto other surfaces.
Position the Diamond Under the Flashlight – Hold the stone at different angles while shining a beam through it. Look for Sparkle and Reflection – A genuine one will reflect brilliant white and rainbow colours due to its superior light dispersion.
Synthetic or fake stones, sparkle less than real, or mined diamonds. With light reflection, look for shades of gray. Synthetic stones, such as cubic zirconia, sparkle with more iridescent colors. Natural diamonds reflect light in more grayish hues.
Can you test a diamond with your phone? You can use your phone's flashlight, or any bright light, as a quick way to observe how a diamond interacts with light.
What Does A Raw Diamond Look Like?
If the setting is gold-filled or gold plated, or even 10 karat gold, that's a low-end setting. Sterling silver is trickier: sometimes diamonds are set in silver. A designer piece (like David Yurman, John Hardy, Lagos, etc.) is likely to have real diamonds, but cheap silver will likely have diamond simulants.
Zircon looks like a diamond but is not as strong. On the Mohs scale, it ranks at 6 to 7.5. If your zircon gemstone has a hardness rating below 7, it can be easily scratched. Zircon is a brittle gem prone to cracking.