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How To Tell If a Diamond Is Real – A Guide From Reputed Diamond Jewelry Store

by Laura Muller

You are investing a whole lot when you opt for Diamonds be it a Diamond Engagement Ring or a stunning piece of Diamond Jewelry. So it’s quintessential to check its authenticity. 

With various types of diamonds available, including lab grown diamonds, knowing how to differentiate a real diamond from a fake can save you both money and disappointment. At Grand Diamonds, a reputed Diamond Jewelry Store in Antwerp, we believe in empowering our customers with knowledge. 

Here’s a comprehensive guide to help you verify the authenticity of your diamond.

Synthetic Diamonds and Diamond Simulants  

Diamonds are regulated by strict guidelines to confirm their identity. Essentially, diamonds are crystals made mostly of carbon, known for their unique appearance and properties. Natural diamonds from mines can simply be called ‘diamonds’, while diamonds made in labs must be clearly labeled. These are the only two types recognized as real diamonds.

Anything else is considered a simulated diamond. Although they might look like diamonds, simulated diamonds have different chemical and visual properties. 

1. The Water Test

One of the simplest tests you can perform at home is the water test. Fill a glass with water and gently drop the loose diamond into it. A real diamond will sink to the bottom due to its high density, while many fake diamonds will float or hover near the surface.

2. The Fog Test

Diamonds are excellent heat conductors. To perform the fog test, hold the diamond between two fingers and breathe on it to fog it up. If the fog dissipates almost immediately, the diamond is real. If it takes several seconds for the fog to clear, it is likely a fake​.

3. The Newspaper Test

Also known as the read-through test, this method checks a diamond’s refractivity. Place the diamond flat-side down on a piece of newspaper with lots of small text. If you can read the letters through the diamond, it’s probably not real. A genuine diamond refracts light so strongly that you shouldn’t be able to see the print clearly​.

4. Scratch Test

5. The Heat Test

Diamonds can withstand high temperatures and sudden changes in temperature. Heat the diamond with a lighter for about 40 seconds and then drop it into cold water. A real diamond will not be affected, while a fake one will likely shatter due to the quick temperature change​​.

6. UV Light Test

Under UV light, many diamonds will emit a blue fluorescence, although not all real diamonds will glow. If your diamond glows blue under UV light, it is likely real. However, if it doesn’t glow, it does not necessarily mean it’s fake​

This method isn’t the best though. While some counterfeits can be induced to fluoresce, the majority will not. Most experts suggest using this method only as a last resort, as it’s easy to make a mistake and reveal yourself.

7. Checking the Setting and Mount

Inspecting the setting and mount of the diamond can also provide clues about its authenticity. Real diamonds are usually set in high-quality metals such as gold or platinum. 

Look for markings inside the setting that indicate the type of metal used. Common markings include 10K, 14K, 18K for gold, and PT or PLAT for platinum. If you see a “C.Z.” marking, the stone is cubic zirconia, not a real diamond​​.

You can check more of these at GrandDiamonds.com

Understanding the 4Cs: Your Diamond Buying Guide

To make an informed decision about your diamond purchase, familiarize yourself with the 4Cs:

  • Cut: The cut of a diamond refers to its proportions, symmetry, and polish. It significantly impacts the diamond’s brilliance and sparkle. Look for well-cut diamonds with excellent light performance.
  • Carat: Carat weight measures a diamond’s size. Larger diamonds are rarer and generally more expensive. However, other factors like cut, color, and clarity can affect a diamond’s overall beauty.
  • Clarity: Diamonds often have tiny imperfections called inclusions or blemishes. Clarity grades indicate the number and visibility of these imperfections. A flawless diamond is rare, but diamonds with very slight inclusions can be just as stunning.
  • Color: Most diamonds exhibit subtle yellow or brown tints. Colorless diamonds are rarer and more valuable. However, diamonds with faint color can still be beautiful choices, especially when set in certain metals.

Bring the diamond to Professionals

 While these at-home tests can be helpful, they are not foolproof. For a definitive answer, it’s best to have your diamond evaluated by a professional jeweler who can use advanced tools such as a thermal conductivity tester or conduct a detailed inspection using specialized equipment.

At Grand Diamonds, we are committed to providing our customers with the highest quality Diamond Jewelry, including lab grown diamonds jewelry that are both beautiful and genuine. Visit us for expert advice and a stunning collection of authentic diamonds.


What are lab grown diamonds?

Lab grown diamonds are real diamonds that are created in a laboratory setting. They have the same physical, chemical, and optical properties as natural diamonds but are typically less expensive.

Can lab grown diamonds be identified using tests?

Most at-home tests such as Water Test, Fog Test, Newspaper Test, Heat Test, UV Light Test cannot distinguish between lab grown and natural diamonds because they share the same properties. A professional gemologist can identify them using specialized equipment.

Are lab grown diamonds as durable as natural diamonds?

Yes, lab grown diamonds are just as durable and beautiful as natural diamonds. They are a great choice for Diamond Engagement Rings and Diamond Wedding Rings.

How can I ensure I’m buying a real diamond?

Purchase your diamond from a reputable Diamond Jewelry Store like Grand Diamonds. We provide certification and a detailed appraisal with every diamond purchase to guarantee authenticity.

Are there any markings I should look for on the diamond?

Look for laser inscriptions on the girdle of the diamond which indicate certification details. Also, check the metal setting for quality marks.

Can I tell if a diamond is real at home? 

While some home tests can provide clues, professional appraisal is the most accurate way to authenticate a diamond.

Are lab grown diamonds real diamonds? 

Yes, lab grown diamonds are real diamonds with the same chemical composition and properties as mined diamonds.

What should I look for when buying a diamond engagement ring? 

Consider the 4Cs (cut, carat, clarity, and color), your budget, and your personal style. Consult with a diamond expert at Grand Diamonds for personalized guidance.

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