Diamond Testers

Shelby Cabrera
12 min readApr 10, 2024



If you’re in the market for a diamond, you know that quality matters. But how can you ensure you’re getting a top-notch piece? Look no further than our Diamond Tester roundup! In this engaging article, we’ve compiled a list of the best tools available to help you determine the quality and authenticity of your diamond. From advanced technology to simple testing kits, you’ll find the perfect option to give you peace of mind when making your purchase. So, dive in and let us help you discover the best Diamond Tester for your needs.

The Top 5 Best Diamond Testers

  1. Efficient Diamond Tester with Thin Probe Tip — Discover the high efficiency SmartPro SPGE-I Gem Eye I, the industry’s thinnest probe tip diamond tester that instantly identifies metals, simulants, and diamonds, all in a portable and versatile gemstone testing device.
  2. Smart Diamond Tester: Efficient and Comprehensive Lab Created and Earth-Mined Diamond Assessment — SmartPro SPS-I Diamond Tester: Effortlessly test Earth-Mined and Lab-Created colorless diamonds from 0.01 ct to 12 ct with Smart touch technology, LED display, and long-lasting battery life.
  3. Intelligent Diamond Tester for Instant Authenticity Testing — Make identification of diamonds and moissanites a breeze with the Presidium Multi Tester III, the world’s first all-in-one instrument for accurate and convenient diamond testing.
  4. Professional Diamond Tester for Novice and Expert: Diamond Selector II with Audio Distinction — Experience the convenience and accuracy of Diamond Selector II, the perfect portable diamond tester for both novice and expert jewelers, featuring a 9V battery and emitting audible sounds for easy differentiation between real and fake diamonds.
  5. Professional Diamond Tester for Precious Stones and Jewelry — Easily distinguish real diamonds from simulated stones with the Dupeakya Professional Diamond Selector II, a compact and portable gem tester perfect for jewelry enthusiasts.

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Efficient Diamond Tester with Thin Probe Tip

Efficient Diamond Tester with Thin Probe Tip | Image

I recently had the chance to try out the SmartPro SPGE-I Gem Eye, a gemstone and diamond tester designed with precision and portability in mind. After using it for a few weeks, I can confidently say that this little gemstone tester is amazingly accurate, easy to use, and incredibly portable. When it comes to identifying and testing diamonds, this device truly stands out among its competitors.

One of the most impressive features of the SmartPro SPGE-I Gem Eye is its ultraslim probe tip, measuring just 0.48mm, enabling it to test even the tiniest diamonds. In my experience, the tester not only identified precious stones and diamonds but also accurately distinguished between metals and simulants. It’s worth mentioning that this device operates without any waiting time between tests, making it a go-to tool for busy jewelers or enthusiasts.

The tester is compact and portable, allowing me to use it during my travels or take it along to trade shows. The SmartPro comes with an option to switch between using a power cord or batteries, providing the flexibility needed for different situations. The color estimator display has made checking my newly acquired stones a breeze.

Overall, the SmartPro SPGE-I Gem Eye is a game-changer when it comes to gemstone and diamond testing. While the product does need a few more gemstone identifications, its pros outweigh the cons, making it a must-have addition to any jewelry enthusiast’s toolkit.

Smart Diamond Tester: Efficient and Comprehensive Lab Created and Earth-Mined Diamond Assessment

As the summer sun blazed down on me, I found myself drawn to the sleek, SmartPro SPS-I Diamond & CVD Tester. Its promise of testing my diamond jewelry with precision was too alluring to resist. As I prepared to dip my jewels with a cautious hand, I couldn’t help but be impressed by its no-warmup time and mercury-free LED light source.

The first test, an Earth-mined diamond, was a breeze. I could actually see the subtle changes in its refractive index that the tester’s Smart touch test switch revealed. The results, indicated by the bright LED lights and a distinct sound, brought me a sense of satisfaction that the tester wasn’t just reading the surface.

However, there’s always room for improvement, and the SmartPro, while useful for day-to-day testing, could benefit from some enhancements. In my experience, it had a tendency to misread moissanite and glass as diamonds. Despite the mercury-free LED light source, it wouldn’t be the tester of choice when the stakes are high and one’s budget is in the tens of thousands.

Nevertheless, the SmartPro SPS-I Diamond & CVD Tester is an affordable lightweight option that has proven useful in my daily life. With the right adjustments, it could become an even more reliable tool for the discerning jewel enthusiast. Until then, I’ll keep using it with a pinch of salt and an eager eye on the market.

Intelligent Diamond Tester for Instant Authenticity Testing

Intelligent Diamond Tester for Instant Authenticity Testing | Image

As a reviewer, I’ve been using the Presidium Multi Tester III (PMuT III) to test various gemstones and it’s been quite the adventure. With its ergonomic handheld design, complete with a rubberized anti-slip grip, I could confidently say that handling this instrument was a breeze. Its lightweight nature and convenient carrying case made keeping it safe and secure on-the-go a non-issue.

Having the world’s first all-in-one instrument that tests for both diamonds and moissanites was really helpful in saving time and effort. The 180-degree multi-viewing LED display allowed me to easily read the results, no matter if I was left-handed or right-handed.

The PMuT III could truly detect these gems based on their thermal and electrical properties. Its retractable probe tip ensured consistent pressure, while the metal alert buzzer made me aware of the contact with the gemstones. The testing could be done immediately without waiting for any time — a feature that definitely saved me time in my daily testing routines.

However, I have to admit that some inconsistencies arose during testing, leaving me unable to completely trust this device’s results. This was particularly true when I tried to test smaller diamonds, where results were not as accurate and reliable as I wished. I wish they could refine this aspect so that every result we get is consistent and accurate.

In conclusion, the Presidium Multi Tester III (PMuT III) was a pretty good instrument to have for verifying the authenticity of diamonds against moissanites, cubic zirconia, and other diamond simulants. While it was generally quite easy to use, there were certain concerns as to its consistency and its performance with smaller diamonds. Nonetheless, it was definitely a handy and portable instrument to have in the field, especially for someone like me who doesn’t mind a bit of adventure in gemstone testing.

Professional Diamond Tester for Novice and Expert: Diamond Selector II with Audio Distinction

Professional Diamond Tester for Novice and Expert: Diamond Selector II with Audio Distinction | Image

I recently came across the Diamond Selector II professional diamond tester by Hqdz, and let me tell you, it’s a game-changer for both novice and expert jewelers like myself. Upon first use, I was impressed by its simple, yet accurate design. The Diamond Selector II’s portable nature made it easy to take with me wherever I went, and the clear LCD display and LED indicator made reading results a breeze.

One feature that really stood out to me was the safety aspect. The metal alert was a thoughtful touch that ensured I wouldn’t accidentally damage the device while handling it. Despite being a professional, I still appreciated the simplicity of operation — even someone with little experience could use it confidently.

However, one minor drawback I discovered was that the battery life wasn’t as long-lasting as I would have hoped. Thankfully, the 9-volt battery included in the package was easy to replace whenever I needed to. All in all, the Diamond Selector II offered a solid combination of accuracy, ease of use, and portability that made it an invaluable tool in my jeweler’s toolkit.

Professional Diamond Tester for Precious Stones and Jewelry

Professional Diamond Tester for Precious Stones and Jewelry | Image

I recently started using the Dupeakya Professional Diamond Selector II, and let me tell you, it’s been a game-changer in my daily life. This tiny, portable device has become my go-to tool whenever I need to verify the authenticity of diamonds or other precious stones. The ease of use and accuracy of the results never fail to impress me.

One of the standout features of this device is its user-friendly interface. It may seem intimidating at first, but once you’ve figured it out, you’ll wonder how you ever managed without it. The voice instructions and audible sounds make it easy for anyone to learn how to use it, regardless of their technical proficiency.

While using the Diamond Selector II, I noticed that it wasn’t just accurate for diamonds, but also for other gemstones, such as sapphires, agates, and crystals. The device comes with a user manual that explains how to differentiate between these stones, making it incredibly versatile.

A minor downside would be the requirement of a battery to operate the device. However, I’ve found that the battery life is quite impressive, and the device is easy to turn on and off, so it’s not a significant concern.

Overall, the Dupeakya Professional Diamond Selector II is a must-have tool for anyone who appreciates the beauty and value of precious stones. Its accuracy, portability, and versatility, combined with its cute, compact design, make it an essential addition to my daily life.

Buyer’s Guide

When it comes to selecting the best diamond tester, there are several factors to consider. This buyer’s guide will provide you with essential information to help you make an informed decision. From understanding the purpose of a diamond tester to evaluating the different types of testers available, we’ve got you covered.


What Is a Diamond Tester and What Does It Do?

A diamond tester is a device used to determine the authenticity of a diamond by measuring its hardness and other properties. It is an essential tool for jewelers, gemologists, and anyone who deals with diamonds, as it helps to ensure that diamonds are not misrepresented or counterfeit. The primary function of a diamond tester is to differentiate between a real diamond, a diamond simulant, and non-diamond materials.

Types of Diamond Testers

There are several types of diamond testers available on the market. The most common ones include digital testers, refractometer-based testers, and thermal testers. Each type of tester has its advantages and disadvantages, so it’s essential to choose the one that best suits your needs and budget. Digital testers are often more affordable, while refractometer-based testers and thermal testers tend to be more expensive but offer greater accuracy and precision.


Important Features to Consider

When shopping for a diamond tester, there are several features you should consider. These include the type of tester, the accuracy and precision of the device, its ease of use, and its portability. It’s also essential to ensure that the tester is calibrated correctly to provide accurate readings. Additionally, you may want to consider purchasing a tester that includes a warranty or a trial period to ensure that you are satisfied with your purchase.

Tips for Choosing the Right Diamond Tester

When selecting a diamond tester, it’s essential to do your research and consider all of the factors outlined above. Talk to other professionals in the industry, read reviews, and compare the features and specs of different testers to find the one that best suits your needs. Don’t be afraid to ask questions and seek out expert advice to ensure that you make the best possible purchase.



What is a Diamond Tester?

A Diamond Tester is a device used to identify natural diamonds, lab-created diamonds, and other diamond simulants such as cubic zirconia, moissanite, and quartz. It tests the properties of a diamond, including its hardness, refractive index, and dispersion, to determine its authenticity and value. The device is easy to use, portable, and reliable, making it a useful tool for jewelers, appraisers, and anyone interested in diamond verification.

Diamond Testers come in various forms, including handheld electric models and digital models with advanced features like touchscreens and built-in databases. These devices provide instant results, allowing users to quickly and accurately assess the quality of a diamond without the need for expensive laboratory testing.

How does a Diamond Tester work?

A Diamond Tester uses advanced technology to test the properties of a diamond. These properties include hardness, refractive index, and dispersion, which are all critical factors in determining a diamond’s authenticity and value. The device typically consists of a probe or pen-like tool that is gently pressed onto the surface of the diamond. The tester then measures the properties of the diamond and compares them against a database of known values for natural and lab-created diamonds.

Some Diamond Testers also feature additional sensors or tools to test the diamond’s specific gravity, thermal conductivity, and other properties. This information is combined to provide a comprehensive assessment of the diamond’s authenticity and quality. Advanced models may also have touchscreens, built-in databases, or other features to improve the user experience and make testing even easier.

What are the benefits of using a Diamond Tester?

The main benefits of using a Diamond Tester include accuracy, convenience, and affordability. By using a Diamond Tester, jewelers, appraisers, and consumers can quickly and accurately determine the authenticity and value of a diamond. This saves time and money compared to traditional laboratory testing, which can be costly and time-consuming.

Diamond Testers are also portable and easy to use, making them a convenient option for those who need to test diamonds on the go. The devices are generally user-friendly, with clear instructions and intuitive interfaces, which makes them accessible to a wide range of users, regardless of their experience level with diamond testing.


Can a Diamond Tester test other types of gemstones?

While Diamond Testers are primarily designed to test diamonds, they can also be used to test other gemstones, including cubic zirconia, moissanite, and quartz. These simulants have properties that are similar to those of diamonds, such as refractive index and dispersion, which means that their authenticity can be assessed using the same testing methods.

However, it’s essential to note that Diamond Testers may not be 100% accurate when testing non-diamond gemstones, as their properties may not match those of natural or lab-created diamonds. In such cases, additional testing or inspection by a gemstone expert may be required for a precise assessment of the gemstone’s authenticity and quality.

How accurate are Diamond Testers?

Diamond Testers are generally accurate when testing natural diamonds and lab-created diamonds, as they are designed to measure the properties of these stones. These properties include hardness, refractive index, and dispersion, which are all critical factors in determining a diamond’s authenticity and value.

However, the accuracy of a Diamond Tester may vary depending on factors such as the device’s quality, the user’s skill, and the specific properties of the gemstone being tested. While Diamond Testers are reliable tools for assessing diamond authenticity and quality, they should not be considered a definitive measure of a diamond’s value or quality. Professional appraisal and certification by a gemstone expert are still essential for determining a diamond’s true value and characteristics.

What should I consider when choosing a Diamond Tester?

When choosing a Diamond Tester, consider factors such as accuracy, ease of use, and additional features. Look for a device that is known for its accuracy in testing diamonds, as well as its ability to differentiate between natural, lab-created, and simulated diamonds. Choose a model with a clear and easy-to-use interface, as well as advanced features like touchscreens, built-in databases, or multiple testing tools.

Additionally, consider the device’s portability and durability, as well as its compatibility with different types of batteries or power sources. Reading reviews from other users can help you make an informed decision on which Diamond Tester to purchase, based on your specific needs and preferences. Finally, be prepared to spend a reasonable amount on a high-quality Diamond Tester, as these devices often require a higher investment to ensure their accuracy and reliability.

As an Amazon Associate I earn from qualifying purchases.