Advertising Disclosure
Diamond Tester Comparison - April 2026
| 1 Best Choice  9.8Exceptional | 2  9.6Exceptional | 3  9.5Excellent | 4  9.4Excellent | 5 Best Value  9.3Excellent |
| View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon |
ModelHMKIS Diamond Tester Pen, Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier, Diamond Selector for Novice and Expert (Non-Rechargeable) | Model Purity Testing Kit for Diamonds Gemstones Moissanites Gold Silver and Platinum Jewelry Electronic Digital Diamond Tester Machine JSP GTE | Model Diamond Tester,High Accuracy Jewelry Diamond Tester Professional Diamond Tester Pen Jeweler Tool for Novice and Expert - Diamond Selector II 9V Battery Included(Black Diamond Testers) | Model HMKIS Diamond Tester, Jewelry Diamond Tester, Thermal Conductivity Meter, Can't Test Metal,Must be Operated with Both Hands | Model Diamond Tester, Professional Jewelers' Gemstone Detector, High Accuracy Diamond Checker Pen Professional for Jewelers, Gem Tester (Jewelry-Only Detection) |
BrandHMKIS | Brand GTE | Brand Hqdz | Brand HMKIS | Brand Siziviki |
Reviews | Reviews | Reviews  | Reviews | Reviews |
Features | ||||
Worth the money 7.9 | Worth the money 7.9 | Worth the money 7.7 | Worth the money 7.6 | Worth the money 7.4 |
Precision 7.9 | Precision 7.9 | Precision 7.7 | Precision 7.7 | Precision 7.4 |
Simple to use 8.4 | Simple to use 8.4 | Simple to use 8.1 | Simple to use 8.4 | Simple to use 7.2 |
Tech Specs | ||||
product dimensions10.16 x 2.17 x 1.38 inches | product dimensions 8 x 8 x 8 inches | product dimensions 3.94 x 1.57 x 1.18 inches 5.28 ounces | product dimensions 7.48 x 2.28 x 1.42 inches | product dimensions 5.31L x 0.87W x 1.57H |
item weight4.2 ounces | item weight 1.68 pounds | item weight - | item weight 6 ounces | item weight 3.52 ounces |
batteries1 9V batteries required. included | batteries - | batteries 1 A batteries required. included | batteries 1 9V batteries required. included | batteries - |
Available On | Available On | Available On  | Available On | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.8
1HMKISHMKIS Diamond Tester Pen, Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier, Diamond Selector for Novice and Expert (Non-Rechargeable)
8.4 Simple to use7.9 worth the money7.9 PrecisionWhy we love it
Accurate diamond identification.
User-friendly for all levels.
Includes handy 60X magnifier.
-
9.6
2GTE
Purity Testing Kit for Diamonds Gemstones Moissanites Gold Silver and Platinum Jewelry Electronic Digital Diamond Tester Machine JSP GTE
8.4 Simple to use7.9 worth the money7.9 PrecisionWhy we love it
Tests multiple jewelry types efficiently.
Includes diamond tester and magnifier.
User-friendly with easy-to-read charts.
-
9.5
3Hqdz
Diamond Tester,High Accuracy Jewelry Diamond Tester Professional Diamond Tester Pen Jeweler Tool for Novice and Expert - Diamond Selector II 9V Battery Included(Black Diamond Testers)
8.1 Simple to use7.7 worth the money7.7 PrecisionWhy we love it
Quick and precise diamond testing.
Easy to use for beginners.
Includes all necessary accessories.
Diamond Tester Buyer's Guide
Written by Rita LeeIntroduction
Diamond testers are invaluable tools for jewelers, appraisers, collectors, and anyone in the diamond trade. They are used to determine whether or not a diamond is real and to identify its quality. A diamond tester is an electronic device that measures the thermal and electrical conductivity of a gemstone and then classifies it as either a diamond or a moissanite. When shopping for a diamond tester, it is important to consider the type of tester you need, its accuracy, and the features included. It is also important to consider your budget, as diamond testers can range in price from a few hundred dollars to more than a thousand.
Types of Diamond Testers
There are three main types of diamond testers: electronic, thermal, and ultraviolet (UV). Electronic testers measure the electrical conductivity of the diamond and are generally the most accurate. Thermal testers measure the diamond’s resistance to heat and are usually the most affordable. UV testers measure the amount of UV light that is reflected off the diamond and are the least accurate. It is important to note that some diamonds may not be detected by certain types of testers, so it is important to consider the type of tester you need based on the type of diamonds you will be testing most often.
Accuracy
Accuracy is one of the most important features to consider when purchasing a diamond tester. The accuracy of the tester should be at least 90%, with some testers having accuracy ratings as high as 98%. It is important to choose a tester with an accuracy rating that is high enough to ensure that you are not mistakenly identifying diamonds as moissanite or vice versa. It is also important to consider the size of the diamonds you will be testing and the type of tester you are using, as some testers may not be able to detect smaller diamonds.
Features
When shopping for a diamond tester, it is important to consider the features offered. Some diamond testers come with a built-in LED display, which can be useful for testing a variety of diamonds. Other features to consider include a backlit display, a thermometer, a digital readout, and a USB connection. It is also important to consider the weight and size of the tester, as some testers may not be able to fit in tight spaces or be carried easily.
Budget
Diamond testers can range in price from a few hundred dollars to more than a thousand. It is important to consider your budget when shopping for a diamond tester. If you are just starting out, you may want to purchase a basic tester that has a lower price tag. If you are more experienced, you may want to invest in a more advanced tester with more features. It is important to consider the features you need and compare them to the price to ensure that you are getting the best value for your money.
Conclusion
When shopping for a diamond tester, it is important to consider the type of tester you need, its accuracy, and the features included. It is also important to consider the size of the diamonds you will be testing and the type of tester you are using. Additionally, it is important to consider your budget when shopping for a diamond tester, as prices can range from a few hundred dollars to more than a thousand. By considering these factors, you can ensure that you are purchasing the right diamond tester for your needs.
Our ranking system
At bestchoice.com, our team curates a selection of top products from a vast array available online, using a sophisticated ranking system based on carefully defined criteria.While traditional hands-on testing has its merits, our use of AI technology offers distinct advantages. AI allows us to process and analyze vast amounts of data from multiple sources, providing a comprehensive view that goes beyond what manual testing can achieve. This approach enables us to deliver insights that are aligned with current trends and consumer preferences, ensuring our reviews are both relevant and up-to-date.
Features
Our AI-driven analysis examines key attributes, capabilities, and other critical factors tailored to each product category. This method allows us to assess effectiveness from various perspectives, ensuring a well-rounded evaluation.
Consumer Reviews
We aggregate and evaluate consumer feedback from across the internet, giving weight to ratings and reviews that reflect the most reliable insights. AI enhances this process by filtering and prioritizing data, offering a balanced view without the need for direct personal endorsements.
Popularity
Our system also considers the popularity of products, analyzing factors such as market presence, reputation, and user satisfaction. By leveraging AI, we capture a comprehensive picture of a product's standing in the market, which may not always be evident through traditional testing.
Value for money
AI allows us to compare products based on attributes like price, specifications, and user feedback, helping to determine their value for money. This data-driven approach offers an efficient and reliable way to assess how products stack up against one another in terms of cost-effectiveness.
