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Best Ways to Identify a Real Diamond

Best Ways to Identify a Real Diamond

03 Jul, 2023 | Gemstone | Gem Selection

Discovering a genuine diamond is a captivating experience. Its breathtaking beauty and brilliant sparkle make it the unrivaled king of gemstones. However, distinguishing a real diamond from a counterfeit requires careful attention to detail and finesse. Here are five simple methods to identify a genuine diamond before seeking a professional gemologist's final confirmation.

  1. Magnification Test: Examine the diamond using a jeweller's loupe or a microscope. A natural diamond possesses imperfections such as irregular shapes and sharp edges, showcasing its origin from a mine. Look for clear-cut facet lines with single refractivity. Be cautious of perfectly shaped diamonds with rounded edges and scattered facet lines. Additionally, observe the metal on which the diamond is mounted. A genuine diamond is typically set on pure gold or platinum rather than gold-plated casting.
  2. Sandpaper Test: Authentic diamonds lack scratches and abrasions, reflecting a flawless shine as they refract light from their smooth, glossy surfaces. To verify a diamond's authenticity, lightly scratch it with rough sandpaper. As diamonds are one of the hardest substances on Earth, a genuine diamond should remain unscathed, retaining its radiant luster. Only a real diamond can cut another real diamond.
  3. Reflection Test: Hold the diamond up to direct sunlight and observe how the rays bounce off the stone. A genuine diamond exhibits a brilliant grey and white sparkle with hints of rainbow-like colours at the edges. Conversely, a fake diamond may display rainbow hues from the center without the accompanying shimmering grey brilliance.
  4. Fog Test: Clean the diamond and expose it to a gentle breath of warm air. Due to its excellent heat conductivity, a genuine diamond should not retain a layer of steam or fog. If the stone remains moist, it is likely an imitation.
  5. Refraction Test: The ultimate test for determining diamond authenticity is the refraction test. Place the diamond on a plain sheet of paper and examine its shadow. A genuine diamond will cast a dark shadow, characteristic of an opaque gem, while displaying enchanting light dispersion through its intricate facets. The scattered light creates a geometric shadow filled with radiance and sparkle. Additionally, try placing the diamond over text and check if the letters remain unchanged. A real diamond will appear opaque and not magnify or distort the text, whereas a fake stone may appear more transparent and reveal hints of the text underneath.


Although conducting these tests can provide initial indications, consulting a professional gemologist is always advisable for complete certainty regarding a diamond's authenticity. A genuine diamond is truly a one-of-a-kind treasure, much like its fortunate owner. It's no wonder this natural masterpiece is often referred to as a girl's best friend!

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