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How to Tell if a Diamond is Real or Fake!

There are many methods to tell if a diamond is real or fake, but most of them are not 100% reliable.

Numerous methods exist to differentiate between real and fake diamonds, but few can guarantee 100% accuracy. A diamond tester, however, is one of the quickest and most reliable ways to verify the authenticity of a diamond. To ensure accurate results, it's important to understand how these devices work and what factors to consider.

A diamond tester is a portable device that assesses the thermal and electrical conductivity of a material to determine if it's a real diamond. Depending on the model, it may utilize either thermal or electrical conductivity measurements or a combination of both. Devices that use thermal conductivity measure how heat travels through the stone, while those that use electrical conductivity measure the flow of electricity through the gem.

The underlying principle behind diamond testers is that each gemstone has a unique chemical structure, and as such, conducts heat and electricity differently. Therefore, a real diamond will exhibit different thermal and electrical conductivity properties compared to a fake diamond, such as cubic zirconia. To use a diamond tester, one simply needs to place the tip of the device on the surface of the stone and observe the rate at which heat or electricity flows through it. If the diamond is authentic, the device will indicate this on its display and produce a sound signal.


Diamond testers are commonly used to differentiate authentic diamonds from imitations. Lab-grown diamonds, which have the same crystal structure, chemical composition, and physical properties as natural diamonds, will also produce positive results when tested with any diamond tester. However, it's important to note that a diamond tester cannot determine if a diamond is natural or lab-grown. Other methods, such as examining colour zoning, strain patterns, inclusions, and fluorescence, are necessary to distinguish between the two. Although lab-grown diamonds pass a diamond tester, unique features resulting from the diamond growing process can help distinguish them from natural diamonds and even identify the method used to create them.

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