You can tell if a diamond is real without a jeweler using simple home tests like the water test (real diamonds sink), the fog test (fog clears instantly on real diamonds), the dot test (can't see through a real diamond over a dot), or checking sparkle/reflections (real ones are brilliant, fakes often rainbowy). However, these aren't foolproof; a professional appraisal is needed for certainty, as high-quality fakes like moissanite can fool many tests, say Ecksand and wikiHow.
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.
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.
A simple way to Test a Diamond's Validity is to put the diamond in a Bowl of Cold Water. A real diamond will sink fast to the bottom. Fake stones will float or ``Bobble'' & won't go straight down / Sink.
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.
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.
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.
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.
Diamond Water Test
This may be the easiest test, but it requires that we have a loose gemstone. Since diamonds have a high density, they will naturally sink when placed into a cup of water. If the stone happens to float, that means it is indeed fake.
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.
Pure diamond is not magnetic.
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.
Remember that a stone's sparkle is a result of its interaction with light—this is true for both genuine diamonds and imitations. However, diamond substitutes like cubic zirconia and moissanite only imitate the brilliance of a real diamond.
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.
Simulated diamonds are also known as diamond simulants and include things like cubic zirconia (CZ), moissanite, and YAG. They can also include some natural clear gemstones like white sapphire, white zircon or even clear quartz. Simulated diamonds do not have the physical and chemical properties of real diamonds.
In order to assess the grades of colour, coloured diamonds are placed into one of nine categories: faint (least valuable), very light, light, fancy light, fancy, fancy dark, fancy intense, fancy deep and fancy vivid (the rarest and most expensive).
Color Is More Visible In Large Diamonds
If you're buying a diamond under 1 carat, you might consider choosing an I, J, or K color diamond. Going over 1 carat? We recommend H color-grade diamonds or higher. This is because the larger a diamond is, the more likely it is to show any color.
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.
The GIA App. The GIA App contains a wealth of diamond resources, including 4Cs interactive tools, and expert articles and videos. Additionally, within the GIA App you can access reports in GIA's secure database anytime, anywhere.
The easiest at-home test is to breathe on your stone. If your stone fogs up quite a bit and takes time for the condensation to evaporate, then it is most likely fake. Real diamonds do fog up, but only a little and the condensation evaporates quickly.
The Scratch Test
Place the glass on a table (or any platform) and use your diamond to scratch the surface of the glass. If it scratches the glass, chances are good that the diamond is real. But, it's important to know that the scratch test could damage your diamond in the process.
The best fake diamonds are cubic zirconia (CZ), moissanite, and lab-grown diamonds. CZ is affordable and looks similar to real diamonds. Moissanite offers great brilliance and durability. Lab-grown diamonds have the same properties as natural diamonds but are more ethical and cost-effective.