The Five Best Diamond Testers

Diamond testers can come in handy for a variety of purposes. Maybe you work with diamonds in you career, or maybe you're planning on buying a diamond second-hand in the near future and want to make sure it's the real thing. No matter what you need a diamond tester for, the list below will have one that's perfect for you.

Presidium Gem Tester II

The Diamond Tester Professional Jewelers Rely On

This professional and well-known diamond tester gives you the right result every time, and it's able to test 16 other common gemstones as well.

Best Overall

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If you’re planning on using your diamond tester in a professional setting, you’ll want to check this one out. This is actually the most reliable diamond tester brand in the jewelry industry, and this version is compact and portable. It can test both polished and unpolished stones, and accurately shows the difference between moissanite and diamond (something that is difficult with other testers). It also has the ability to test 16 common gemstones alongside diamonds.

This diamond tester is easy to use and the results are shown in a simple analog format. It has built-in calibration, so you don’t have to change settings when you switch from testing indoors to outdoors (or vice versa). It has an extremely thin probe, so you can test stones as small as .02 carats.

Pros:

Provides extremely accurate results
Made by a well-known and trusted company
Tests gemstones along with diamonds, and stones of all sizes

Cons:

Some reviews state this tester is difficult to use if you don’t have in-depth gemstone and diamond knowledge
High price point

Puritest Jewelry Testing Kit

A Diamond Tester Kit With Everything You Need

This kit comes with a diamond tester and everything else you could even need when you're testing stones.

Best Diamond Tester Kit

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This kit is perfect for anyone that is just dipping their feet into the jewelry and gemstone industry. It is a large kit that comes with everything you may need when testing jewelry. This includes the diamond tester itself, a kit for testing precious metals including platinum, gold, and sliver, a stand to set stones in while you test them, a magnifying glass, a small scale, and a set of jewelry files.

The diamond tester is made to just test diamonds. One feature it comes with is the ability to distinguish stone from metal. This is helpful when you are working with extremely small stones, as the tester will sound a buzzer if you’re touching metal to help you find the right spot and get an accurate reading on the stone itself.

Pros:

Comes with everything you need for jewelry testing
Diamond tester buzzes when it touches metal

Cons:

This isn’t the best deal if you only need a diamond tester

Portable Gemstone and Diamond Tester II

A Diamond Tester That Comes With A Magnifying Glass And A Testing Stand

If you're looking for a smaller set with just the beginner essentials, this tester may be right for you.

Best Small Set

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This is a highly accurate diamond tester that comes with a magnifying glass. A magnifying glass can be a helpful tool when you need to inspect a stone for its quality. A case for each item is included in the purchases as well, so you can keep them in excellent condition even while you’re on the go.

This diamond tester is also extremely easy to use. It once again has a buzzer that will go off if the tip touches metal, and it shows a green light if the diamond is legitimate. If the diamond is fake, it will not show any type of reaction. The tester needs a 9 volt battery to operate, and this battery is not included with the purchase.

Pros:

Comes with a magnifying glass
Extremely easy to use
Comes with carrying cases

Cons:

You’ll need to buy a battery before you can use this tester

HDE Diamond Tester Kit With Gem Tester And Digital Pocket Scale

A Diamond Tester That Comes With A Scale

If you want to be able to wight jewelry when you check the stones, the diamond tester is the perfect choice.

Best Tester With A Scale

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This is a diamond tester that comes with a pocket-sized jewelry scale. Just like the product above, this set comes with protective cases for everything included so you can keep your equipment safe during travel. The scale is easy to use and can be set to measure ozt, dwt, grams, and ounces, so you can use it however you’re most comfortable (and for a variety of purposes).

The diamond tester is easy to use and simply tells you if a diamond is real or fake. It does also have a buzzer that goes off when the tip hits a metal material, so you can test even the smallest diamonds and get accurate results. Both the tester and the scale require batteries for use, and the batteries are not included in the purchase of the set.

Pros:

Easy to use
Comes with a scale
Comes with protective cases

Cons:

This is labeled as a “Gem Tester,” which may seem inaccurate since it only tests diamonds. You’ll want to keep this in mind when purchasing

Best High Accuracy Diamond Tester For Novice And Expert

An Accurate, Yet Affordable, Diamond Tester

This diamond tester provides great results and you can purchase it for a low price.

Best On A Budget

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This is an excellent diamond tester and it’s available at a low price. It’s advertised as being good for both beginners and field experts. The tester has no reaction when a stone is fake, so it’s easy to tell if you’ve got a real diamond or not. It’s also built to do this quickly and safely.

This diamond tester is small enough to fit in your pocket, and it has a buzzer that goes off when the tip comes into contact with metal. It runs off of a 9 volt battery, and this battery comes free with the purchase of the product.

Pros:

Affordable price
Easy to use
Comes with the necessary battery

Cons:

This diamond tester does not come with any added accessories

Frequently Asked Questions:

Q: How Do Diamond Testers Work?

A: Every diamond tester has a small, pointed end that sits directly on the diamond during testing. This tester checks the rate at which heat passes through the stone. This thermal conductivity testing will show whether a store truly is a diamond, since diamonds are very unique in the way they respond to heat.

Q: What Should I Keep In Mind When Buying A Diamond Tester?

A: The biggest thing you’ll want to look for is a diamond tester that actually works. There are hundreds of different diamond testers available today, but some are not as high quality as others. If you purchase a low quality tester, you may receive inaccurate results (especially with stones such as moissanite, which has a closer thermal conductivity level to diamonds than most other stones). You’ll also want to keep in mind any additional features you’d like your diamond tester to have. For example, you may want to have the ability to test multiple types of stones, or you may want a tester that comes with a scale or a place to set diamonds while you test them.

Diamond testers are a great tool to have, whether you work with precious stones professionally or you’re planning on purchasing a diamond second-hand in the future. Consider the quality of the tester you’re planning on buying, as well as any additional qualities you’d like the product to have. Choose the diamond tester that best suits your needs from the list above, and enjoy being able to check stones whenever you please.