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Diamond Tester Comparison - September 2025
| 1 Best Choice  9.8Exceptional | 2  9.7Exceptional | 3 Best Value  9.5Excellent | 4  9.4Excellent |
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ModelHMKIS Diamond Tester Pen, Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier, Diamond Selector for Novice and Expert (Non-Rechargeable) | 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 Xinler Accuracy Jewelry-Diamond Tester Pen Professional Jewelry Diamond Tester Tool | Model Diamond Tester, Professional Jewelers' Gemstone Detector, High Accuracy Diamond Tester Pen Professional (Metal Detection Limitation) |
BrandHMKIS | Brand Hqdz | Brand xinler | Brand Siziviki |
Reviews | Reviews | Reviews  | Reviews |
Tech Specs | |||
product dimensions10.16 x 2.17 x 1.38 inches | product dimensions 3.94 x 1.57 x 1.18 inches 5.28 ounces | product dimensions 7 x 1.8 x 1.4 inches | product dimensions 5.31L x 0.87W x 1.57H |
item weight4.2 ounces | item weight - | item weight 3.84 ounces | item weight 3.52 ounces |
customer reviews4.2 4.2 out of 5 stars 6, 261 ratings 4.2 out of 5 stars | customer reviews - | customer reviews 3.9 3.9 out of 5 stars 337 ratings 3.9 out of 5 stars | customer reviews 3.8 3.8 out of 5 stars 138 ratings 3.8 out of 5 stars |
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)
Why we love it
Accurate diamond identification.
User-friendly for all levels.
Includes handy 60X magnifier.
Main highlights- [Warm Notice]:Make sure to test according to the correct testing procedure, avoid using the diamond tester on unsuitable items(metal,skin,water and ect.), to ensure accurate testing results. Any improper operation may affect the accuracy of the test.
- [Touch Panel]: We have to touch the panel on the back when testing. Othersize we will get a wrong result.
- [Rapid Assurance] The Professional Diamond Selector II swiftly verifies the authenticity of diamonds with precise accuracy. Designed for quick and secure testing, this diamond selector features an LCD display, LED indicator, and large/small switches for testing diamonds. Audible signals provide further assistance in interpreting readings, ensuring a swift and confident evaluation process.
- [Power Upgrade] The HMKIS diamond tester offers two power supply options: Type-C and 9V Power (includes a 1m Type-C cable). Utilizing a Type-C power supply delivers a more stable and precise voltage output, thereby enhancing the accuracy and reliability of experimental and test results. Opting for the Type-C power supply is highly recommended for optimal performance. PLZ NOTE THIS IS Non-Rechargeable !
- [Package include]:1 x Diamond Tester Pen, 1X 60XJewelers Loupe,1x 1M USB Cabel,1 x Testing Platform,1 x User Manual
- [Jewelers Loupe] The 60X LED Jewelers Loupe with batteries is a versatile tool that can be used for a wide range of applications. Whether you are examining gems, coins, antiques, stamps, conducting readings, inspections, jewelry appraisals, studying rocks, watches, calligraphy, paintings, pursuing hobbies, collecting antiques, building models, working in the photo industry, testing electronic products, or simply using it for tasks in your home life or office, this Jewelers Loupe is an essential tool. Its compact design and powerful LED lights make it convenient for use in various settings, providing clear and detailed magnification for all your viewing needs.
- [Incorrect Contact]: When we have incorrect contact, this diamond tester pen will have a flashing OR it will turn off. When you testing metal,skin,or something else.
- [Easy Use]The HMKIS Diamond Tester Pen is a user-friendly tool that eliminates the need for professional knowledge in diamond testing. With just a few simple steps, anyone can determine the authenticity of a diamond. By turning on the Diamond Tester Pen detector, selecting the diamond size, and placing the tip of the tester on the gemstone, users can easily identify whether the stone is a genuine diamond or if it is made of glass, crystal, or cubic zirconia based on the results. The red light and beep emitted by the diamond tester indicate the presence of a diamond, making it a convenient and easy-to-use tool for anyone in need of quick and accurate diamond testing.
- [Adjust Size]:We have to choose the diamond size before using the diamond tester.Otherwise we may get the incorrect result.
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9.7
2Hqdz
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)
Why we love it
Quick and precise diamond testing.
Easy to use for beginners.
Includes all necessary accessories.
Main highlights- [Simple to Use]:Hqdz Diamond Tester Pen is simple to operate to get results, professional(s) are not required. Simply turn on our Diamond Tester Pen detector; place the tip of the Diamond Tester on the gem stone (lightly pressed is sufficient) and If the stone is fake, crystal or cubic zirconia, the tester will not beep.
- [Package include]:Diamond tester is battery powered for convenience.Requires 1 standard 9v battery, which is included.Package include:1 x Diamond Tester,1 x Leather Pouch Case,1 x Testing Platform,1 x User Manual,1 x DC 9V battery.
- [High-Frequency Sound when Testing Metal]:The high-frequency sound during metal testing is due to the test pen's operational principle, which relies on thermal conductivity to distinguish between diamonds and fake gemstones. Since metal possesses thermal conductivity similar to diamonds, it generates a high-frequency sound during testing.
- [Fast and safe ]:Professional Diamond Selector II will indicate genuine diamond or fake.It is designed for quick, precise, and safe diamond testing.LCD display & LED indicator.Uses large / small switches for testing diamonds,Emits audible sounds to easily differentiate the readings.
- [Beeping Upon Startup]:Ensure correct installation and adequate power in the test pen battery. Also, clean the test pen probe as maintaining its cleanliness can enhance testing efficacy.A beeping sound upon powering on signifies the need for initialization settings. Consult the table on the rear of the machine for the specific initialization settings considering the diamond's temperature and size. Adjust the initial number of illuminated lights by rotating the knob (the default setting is to have 4 lights illuminated at room temperature).
- [Bare Hands Operation]:All the tests must be done by your bare hands. If you put on your gloves, the metal alert will not function since a normal moisture levelof your hands is necessary for operation.All test must be done by TWO hands, one for hold the diamond and one for the diamond tester. As for the hand which hold diamond tester, you have to touch the electricity conductive panel on the back of the unit.If you test the diamond just by one hand, you will get a wrong result.
- [ Note]: The battery temperature is lower than 10 degrees Celsius, which seriously affects the use time Don't wear gloves，Don't detect metal Best to measure in no wind conditions，The operating temperature is within the range of 10-35 degrees Celsius, and the humidity is below 80% When testing diamond, your right index finger must keep touching the metal panel on the back of the tester. Please turn off the power after the test to save power.
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9.5
3xinler
Xinler Accuracy Jewelry-Diamond Tester Pen Professional Jewelry Diamond Tester Tool
Why we love it
Detects multiple gemstone types.
Great for second-hand jewelry checks.
Accurate and reliable readings.
Main highlights- ★ NOTICE: * No matter what gemstone you are testing, the probe needle and the tested object must be at a 90° angle. * When testing diamond, your right index finger must keep touching the metal panel on the back of the tester, while you do not touch the panel if you test other gemstones. * Do Not test any metal. * Do Not wear glove.
- This gemstone testing equipment is not only a diamond tester, but also a multi gemstone tester. It can detect if a gemstone is real or fake, including: diamond, sapphire, ruby, crystal, agate, jadeite, and other precious stone of various sizes.
- Product size: 16 * 4 * 2.2 cm. weight: 100g. Power needed: 1x 9V battery (not included). If you have any problem about the testing, please contact us, we would love to help.
- Before Test: 1. Put the battery in the tester. 2. Take off the probe cap. 3. Turn on the switch. 4. Make sure only one light light up on the scale. 5. Make sure the " ready lamp" light on. 6. (If test diamond, you then need to turn on the lights number corresponding to the indoor temperature and diamond weight.). 7. (If test other gems, you'd better calibrate the probe, method: by placing the probe vertically on a glass, then adjusting the light to 5, then test the gems.)
- * If the number of lights equals or exceeds 9, and it beeps, it means the diamond is true. * If the lights is about 9 and it beeps, it means the sapphire is true. * If the number is 6.5-7, it means the agate is true. * If the number is 7-8 , it means the crystal is true. * If the number is 6-7, it means the jade is true.
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.
