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Diamond testers are accurate when it comes to detecting the difference between natural diamonds and moissanite or fake stones. There are many different types of diamond testers on the market today, including handheld devices requiring you to place your stone inside a machine for examination. These machines can detect genuine and simulant diamonds but cannot tell you what type of stone you have.

What Is A Diamond Tester?

A diamond tester is a tool that can help you determine whether a diamond is real or fake. There are several different types of diamond testers, so it’s essential to choose the right one for your needs. A good rule of thumb is to look at the tester’s price and functionality before buying it.

How Does A Diamond Tester Work?

A diamond tester is a small, handheld device that uses thermal conductivity to determine whether a stone is a natural diamond or a fake. When the tester is placed against the stone, it sends a small electrical current. If the stone is a natural diamond, the current will flow quickly through it because diamonds are good conductors of heat. If the stone is a fake, the current will be slowed down because most fakes are made of materials that are poor conductors of heat.

How Reliable Are Diamond Testers?

There are many different types of diamond testers on the market, and their reliability can vary significantly. The most crucial factor to consider when choosing a diamond tester is its accuracy.

Many diamond testers use thermal conductivity to test for the presence of diamonds, but this method is only sometimes accurate. Infrared spectroscopy is another popular method for testing diamonds, and it is generally more accurate than thermal conductivity.

However, it is essential to note that even the best diamond testers can only estimate a diamond’s authenticity; they cannot give a definitive answer. When purchasing a diamond tester, buy from a reputable source. If you are still determining the authenticity of a particular tester, you can always ask a jeweler or gemologist for their opinion.

Available Types Of Diamond Testers

There are a few different types of diamond testers on the market:

  1. Thermal Conductivity Testers: This measures how well heat is conducted through the stone. If the diamond is natural, it will conduct heat better than a fake.
  2. Electrical Conductivity Testers: This measures how well electricity is conducted through the stone. Again, if the diamond is natural, it will conduct electricity better than a fake.
  3. Refractometer: This measures the stone’s refractive index, which is how much light bends when it hits the surface. Diamonds have a higher refractive index than most other materials, which can be an excellent way to tell if a stone is natural.
  4. Ultraviolet Light Tester: This exposes the stone to ultraviolet light and looks for fluorescence. Natural diamonds often fluoresce under UV light, while fakes usually do not.


When it comes to diamond testers, accuracy is critical. Nazar’s & Co. Jewelers offers a variety of high-quality diamond testers that are designed to be accurate and reliable. Visit our website or contact us today to learn more about our selection of diamond testers and how they can help you make the best decisions when purchasing diamonds.


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