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How Can You Spot A Fake Diamond

Today’s society considers diamonds a status symbol and an emotional purchase.

This has resulted in people going for brand names and, in turn, paying vast amounts for the jewelry they desire. The outcome of this is the purchase of real and fake diamonds and other gems.

Fake diamonds are becoming a big problem, leaving the industry in turmoil. The jeweler industry has suffered massively, leading to consumers paying massive amounts for authentic jewelry.

Today, you can determine real versus fake diamonds using the tips below. This article will discuss how you can spot a fake diamond.

What Are The Alternative Stones To Real Diamonds

Alternative Stones To Real Diamonds

The outlined alternatives to diamonds have different chemical compositions; therefore, you need other methods to differentiate them from genuine diamond stones.

A fake diamond might be any of the following stones:

  • White Zircon
  • White sapphire
  • Cubic Zirconia
  • Lab-grown diamond
  • Moissanite
  • Glass
  • White topaz
  • Quartz
  • White Spinel

How Can You Tell if a Diamond Is Real or Fake?

You can use the following methods to determine if a diamond is real or fake:

1. Use The Water test

Natural diamonds have a high density to them. Slowly drop the stone in a glass of water and watch if it sinks or floats. If it sinks, it’s real; otherwise, if it comes near the water’s surface or floats, it’s a fake.

2. Use The Fog Test

Diamonds typically conduct and lose heat fast. For this test to be effective, hold the diamond between two fingers and puff some air on it. The hot breath forms a light fog on the stone. You have a real diamond on your hands if the fog disappears immediately. Otherwise, if it takes some seconds to dissipate, it’s fake.

3. Use UV Fluorescence

For this test, use a blacklight for the best results. Shine the UV light and observe if the light fluoresces. If the stone emits some blue color, it’s likely a real diamond. If not, then it’s a fake. The blacklight test is, however, non-definitive due to some diamonds lacking any form of fluorescence or having a yellow fluorescence.

4. The Newspaper Test

Although this test is less practical for small diamonds, it can prove helpful in some situations. Place the stone on a newspaper and try to read through it to the paper. A real diamond refracts so much light that you can’t read through it, while a fake one allows you to see through it.

5. Weighing

You can measure your stone using a high-accuracy gem scale and some calipers. Compare the carat weight and width. The weight and width should match the industry standard charts. Also note that topaz, moissanite, and Spinel have similar densities to diamonds.

6. Use a Magnifying Glass

Most real diamonds have some degree of imperfections known as inclusions in them. Using a magnifying glass, inspect the stone for inclusions. If there are none, the stone might be a fake diamond masquerading as one. Flawless diamonds are extremely pricey or made in the lab.

7. The Heat Test

For this test, you need a lighter or a candle. Hold the stone over the heat source for about 45 seconds and drop it into ice-cold water. If the stone shutters are, then it’s a fake. Real diamonds can withstand extreme heat conditions without cracking. The fast contraction and expansion due to heat lead to fake stones such as glass or zirconium breaking easily.

8. The Refractive Dot Test

Similar to the newspaper test, the dot test uses refraction to ascertain the quality of a stone. Use a pen and draw a dot on a piece of paper. Put the stone on the dot with the flat surface as the base. Look through the stone and observe if you can see the dot. Natural diamonds have refractive properties, preventing the visibility of the dot.

9. Reflectivity Test

Diamonds commonly reflect white and gray like sparkling with scatters of rainbow colors around. Diamonds also reflect a fire-like colored light magnificently.

On the other hand, fake stones do not exhibit a white and gray color presence.

10. Professional Diamond Testing Methods

Gemologists utilize thermal conductivity meters to determine the chemical compositions of diamonds. The meter determines the thermal conductivity of a gemstone by warming and measuring the heat dispersion of the stone.

The slower the heat dispersion, the more natural the diamond is, and vice versa. As a jewelry buyer, It’s worth noting that some stones, such as synthetic moissanite have similar or equal heat dispersal as natural diamonds. This means that this test is inconclusive with moissanite.

Gemologists also use a 1200x magnification-powered microscope to scrutinize gemstones. The 1200x microscope reveals inclusions and tiny differences in moissanite compared to real diamonds.

You can also send your cut stones to a lab for an X-ray examination. The x-ray tests can tell if the gemstone has a radiopaque (fake) or a radiolucent (real) molecular structure.

Can I Use A Loupe To Check The Accuracy Of The Diamond?  

Many jewelry makers use loupes to identify whether a diamond is fake or not. With a loupe, a small device, you will be able to find even the smallest details on a diamond.

It does not rely on the method of weighing alone for the identification of real diamonds. Instead, it considers more important 4C parameters to decide whether the gemstones are real or not.

Those universally accepted 4C parameters for the identification of diamonds are:

  • Color
  • Cut
  • Clarity
  • Carat Weight

Among all these categories, many jewelry makers and gemstone experts find the cut of a diamond as the most important parameter for assessing its authenticity.

How Can You Identify The Fake Diamonds In This Method?  

The areas of natural imperfections are important for the identification of real and fake diamonds. When the diamond you are testing is real, you will notice a lot of blemishes and imperfections on it. In fact, the stones will also have color dots and traces of minerals.

However, a fake diamond is created in laboratories. So, it will have no imperfection areas or blemishes. In other words, it will appear very pure.

In addition, the natural diamonds have sharp and unshaped edges. On the other hand, the diamonds made in laboratories will have rounded edges.

Having said that, there is a type of diamond that comes in flawless clarity. These diamonds do not have inclusions or impurities.

However, that does not label them as impure diamonds. So, when dealing with diamonds or any other precious gemstone, it’s always better to seek advice from an expert.

Can I Find A Fake Diamond When Inserted In A Setting?  

Yes, you can test the authenticity of a diamond even when it’s inserted in a setting. The general rule is that you will always find a genuine diamond in a more expensive setup in comparison to the fake ones.

So, when a diamond is inserted in a setting, you must check the marking of the metal. If the setting is made up of gold, you must look for the following settings:

  • 10k or 417
  • 14k or 585
  • 18k or 750

Further, if the setting is made of platinum, you should check the PT or Plat marking. In addition, when a diamond is inserted in a setting, you can check its marking.

Checking the marking of the diamond will help you have a proper idea of its authenticity. For example, if a diamond has a C.Z. stamp, it is made of cubic zirconia.


Try our recommended home tests to know whether the stones you have are real diamonds or not. If the home tests are unsatisfactory, seek the help of a professional gemologist. A professional will give you a more detailed report on the authenticity of your gemstone.

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