How to Tell If Your Diamond is Real: Expert Tips from Deep Shine Jewellers

Aug 24, 2025By allistair alley
allistair alley

Understanding the Basics of Diamond Verification

Diamonds are one of the most sought-after gemstones in the world, and their allure can often lead to confusion between real and imitation stones. At Deep Shine Jewellers, we believe that every diamond owner should be equipped with the knowledge to verify the authenticity of their gems. Whether you're a seasoned collector or a first-time buyer, these expert tips will guide you in distinguishing genuine diamonds from fakes.

diamond close-up

Conducting a Simple Water Test

A straightforward way to test a diamond's authenticity is by using water. Fill a glass with water and gently drop your diamond into it. A real diamond will sink due to its high density, while a fake one may float or remain suspended. This test is quick, easy, and can be done with items you already have at home.

Utilize the Fog Test for Quick Results

The fog test is another simple method to assess whether your diamond is real. Hold the diamond between two fingers and breathe on it, similar to how you would fog a mirror. A genuine diamond will disperse the heat from your breath almost instantly, leaving no trace of fog. In contrast, a fake diamond will stay fogged for a few seconds longer.

diamond comparison

Advanced Techniques for Diamond Authentication

If you want to delve deeper into verifying your diamond's authenticity, consider using a jeweler's loupe to examine its facets and edges closely. Real diamonds typically have sharp, clear-cut edges, while imitations might appear rounded or smooth due to different manufacturing processes. The loupe will also help you spot any inclusions or flaws that are common in natural diamonds.

Testing Diamond Conductivity

Another effective technique is testing thermal conductivity. Diamonds are excellent conductors of heat, which means they quickly disperse heat away from their surfaces. Using a thermal conductivity tester, also known as a diamond tester, can provide fast and reliable results. Most fake diamonds like cubic zirconia do not conduct heat as efficiently.

diamond testing

Seeking Professional Appraisal

For those who want absolute certainty, the best course of action is to seek out a certified gemologist or an experienced jeweler like those at Deep Shine Jewellers. Professionals have access to advanced tools and techniques that can accurately determine the authenticity of your diamond. Plus, they can provide you with a detailed certification for your peace of mind.

The Importance of Certification

When purchasing diamonds, always ask for a certificate from a reputable grading laboratory such as GIA or AGS. These certificates offer detailed insights into the quality and authenticity of your diamond, including its cut, clarity, color, and carat weight. Possessing such documentation not only confirms the legitimacy of your purchase but also adds value to your investment.

In conclusion, being able to differentiate between real and fake diamonds is an essential skill for any jewelry enthusiast. By using these simple tests and consulting with professionals, you can ensure that your sparkling gem is genuine. At Deep Shine Jewellers, we are committed to helping you make informed decisions about your jewelry purchases.