10 Surefire Ways to Identify a Real Diamond


Diamonds are breathtakingly beautiful precious stones that have always captivated and enchanted individuals from all over the world. However, distinguishing the genuine from the counterfeit, especially when buying online, can be a difficult and daunting task. In this comprehensive guide, we have compiled ten surefire ways to identify a real diamond, which will help you purchase a genuine diamond with confidence and ease.

Target Audience

This guide is written for individuals who are interested in buying diamond jewelry, either for self-use or as a gift for a loved one. It is also ideal for beginners who have little or no knowledge about diamonds and the jewelry industry but want to make an informed decision when buying diamonds.

1. The Four Cs

The four Cs are the four key characteristics that determine a diamond’s quality and value. These characteristics include color, clarity, carat weight, and cut.

Color: Diamond color ranges from colorless, or white, to light yellow or brown. The less color a diamond has, the higher its value. Colorless diamonds are the most valuable, followed by near-colorless and then the faint yellow range.

Clarity: Diamonds are graded based on their clarity, which refers to the number and size of inclusions and blemishes within the stone. The fewer the inclusions and blemishes, the more valuable the diamond. Clarity is ranked on a scale from flawless to included.

Carat Weight: A diamond’s carat weight is a measure of its weight, with one carat being equal to 0.2 grams. Larger diamonds are more valuable than smaller ones, provided that all other criteria are equal.

Cut: A diamond’s cut is perhaps the most critical factor in determining its beauty and value. It refers to the symmetry, proportion, and polish of the diamond. A well-cut diamond is more valuable than a poorly cut one, even if their carat weight, color, and clarity are the same.

2. The Diamond’s Certificate

Before purchasing a diamond, check to ensure that it comes with a grading certificate from a reputable gemological laboratory such as GIA, AGS, or IGI. The certification authenticates the diamond’s four Cs, making it easy for you to verify the quality and value of the diamond.

3. The Diamond’s Sparkle

A real diamond is known for its exceptional brilliance and sparkle. When a diamond is exposed to light, it should reflect light in a way that results in a vibrant, fiery appearance. A dull or lifeless diamond is a tell-tale sign that it’s not real.

4. The Refraction Test

The refraction test is an excellent indicator of a diamond’s authenticity. Place the diamond face-down on a newspaper or a piece of printed text, and if you can read the text through the diamond, it’s likely a fake. Diamond refracts light more than any other mineral, and this property causes it to bend light waves and scatter them, making it difficult to read printed text through it.

5. The Fog Test

The fog test is a simple way to determine if the diamond is real or not. Hold the diamond between your fingers and breathe on it with your mouth. If the diamond fogs up, it’s fake. Diamonds are excellent heat conductors, so they immediately disperse heat when they come into contact with warm breath, leaving no fog or residue.

6. The Weight Test

Since diamonds are naturally very dense, they should feel heavier than other minerals of the same size. If the diamond feels light and airy, it’s likely a fake. You can also weigh the diamond on a small kitchen scale. A real diamond will weigh an exact amount according to its carat weight as mentioned in the diamond certificate.

7. The Transparency Test

Hold the diamond up to the light and check for transparency. If you can see through the diamond, it’s probably fake. Real diamonds have a high level of refractive index, which means they don’t allow light to pass through them, while fake diamonds have a low refractive index.

8. The Heat Test

Diamonds are virtually indestructible and can withstand high heat. Hold the diamond in a pair of pliers and hold it directly over a flame for 30-40 seconds. If the diamond is real, it should come out of the flame unscathed. However, be careful not to touch the diamond immediately after removing it from the flame, as it can still be very hot.

9. Magnet Test

Diamonds are non-magnetic; hence a quick magnet test is an efficient way to weed out fake diamonds. Hold the diamond next to a piece of magnet and if it attaches to it, it’s not a real diamond.

10. The Scratch Test

Diamonds are the hardest minerals on Earth, making them almost impossible to scratch or damage with other materials. To perform a scratch test, take a piece of glass and try scratching it with your diamond. If the diamond scratches the glass, it’s real. If it doesn’t, it’s a fake.


Buying a diamond can be an intimidating process, but with these ten surefire ways to identify a real diamond, you can rest easy knowing that you are purchasing a genuine diamond. However, it’s vital to remember that most fake diamonds are of good quality and can be difficult to distinguish from the real thing unless you are an expert. Therefore, it’s best to purchase diamonds from a reputable vendor and always request certification to authenticate the diamond’s four Cs. Additionally, use these tips only as a guide and trust your instincts. If a deal seems too good to be true or something feels off, it’s best to walk away.

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