Looking for a reliable diamond detectors in 2025? You’re not alone. With so many models available today, it’s easy to get lost—especially when descriptions are vague or customer reviews are all over the place. That’s why we decided to sort things out. Not by claiming to know everything, but by analyzing what sells well, what real users say, and what’s worth your attention both on paper and in practice. Our goal isn’t to drown you in technical details, but to guide you toward the best possible choices—without wasting hours comparing on your own. In short, a practical and hopefully useful guide.
This gemstone testing equipment is not only a diamond tester, but also a gemstone tester. It can detect whether a gemstone is real or fake, including: diamond, sapphire, ruby, crystal, agate, jadeite and other gemstones of various sizes.
If the number of lights equals or exceeds 9, and it beeps, it means the diamond is real. *If the lights are about 9 and beeps, it means the sapphire is real. *If the number is 6.5-7, it means the agate is real. *If the number is 7-8, it means the crystal is real. *If the number is 6-7, it means the jade is real.
Before testing: 1. Insert the battery. 2. Remove the probe cover. 3. Turn on 4. Make sure only one light on the scale turns on. 5. Make sure the "lamp ready" light is on. 6. (If you test the diamond, turn on the number of lights corresponding to the interior temperature and weight of the diamond.) 7. (If you test other gems, it is better to calibrate the probe, method: place the probe vertically on the glass, then adjust the light to 5, then test the gems)
★ Notice: *No matter what gemstone you are testing, the probe needle and the tested object should be at a 90° angle. *When testing diamond, your right index finger should keep touching the metal panel on the back of the tester, while you do not touch the panel if testing other gemstones. *Do not test any metal. * Do not use a glove.
Product size: 16*4*2.2cm. Weight: 100g. Power required: 1 x 9V battery (not included). If you have any problems with the tests, please contact us, we would love to help you.
【High Accuracy Diamond Tester】This diamond tester is designed for fast, accurate and safe diamond testing, not harmful to diamonds.
【Easy to Use】Real Diamond will Emits sounds and lights >=9. Fake crystal, such as cubic zirconium ( CZ ), crystal, glass will be no sounds and lights <9.
【60X LED Magnification】60x led magnification with battery, suitable for gemstones, coins, antiques, stamps, reading, inspection, etc.
【Package Includes】1 x diamond tester, 1 x 60X Mini LED Magnifying,1 x user manual. This diamond tester uses DC9V battery (NOT included).
【Aftersales】Please read the instructions and detailed description before use. If you have any problem about the diamond tester pen, please feel free to contact us!
Perfect Combination: the package includes 1 piece of Jewelry tester and 2 piece of Jewelry loupe, which are complete and practical for you to test or observe diamonds, bringing you a good using experience.
Clear Screen & Audio Instruction Design: these high accuracy diamond testers are designed with a clear screen, so you can get the useful data quickly. The jewelry diamond tester is equipped with LED lights and audio instructions. As long as the tip is perpendicular to the test masonry and the switch is pressed, the result can be obtained.
Dual Function: The diamond tester can test the authenticity of diamonds(above 9), and can also test the hardness of finished jade crystal agate with a hardness value between 5-9.
Magnifying Glass Accessory: 2 pieces magnifying glass are provided, one is equipped with 60X and LED illumination. The other features 2 Lenses(30X 60X) and 2 LED lights. Clear magnification effect, refine surface, comfortable and natural to use. They can be applied for gems, jewelry, coins, stamps, watches, hobbies, models and observing other items you want.
Wide Application: Diamond test pen can be used for gems, coins, antiques, stamps, reading, inspection, etc. Diamond tester pen is designed for fast, precise and safe diamond testing.
How to choose a good diamond detectors?
On the surface, choosing a diamond detectors seems simple. But once you dig in, it gets more complicated. Between technical differences, unfamiliar brands, and unclear features, it’s better to ask the right questions:
Usage: Will you use it daily or only occasionally? That heavily influences the right model.
Budget: No need to go for the most expensive one right away. What matters is the value for money.
Key factors:
Durability, build quality, lifespan
Truly useful features (not just marketing buzz)
User reviews, especially after weeks or months
Availability of customer service in case of issues
We’ve cross-checked multiple sources: Amazon data, detailed reviews, search trends… and a bit of intuition too—because numbers don’t tell the whole story. This mix allows us to build our ranking, which we update regularly. The goal isn’t to just list names but to guide you toward what truly works.
This gemstone testing equipment is not only a diamond tester, but also a gemstone tester. It can detect whether a gemstone is real or fake, including: diamond, sapphire, ruby, crystal, agate, jadeite and other gemstones of various sizes.
If the number of lights equals or exceeds 9, and it beeps, it means the diamond is real. *If the lights are about 9 and beeps, it means the sapphire is real. *If the number is 6.5-7, it means the agate is real. *If the number is 7-8, it means the crystal is real. *If the number is 6-7, it means the jade is real.
Before testing: 1. Insert the battery. 2. Remove the probe cover. 3. Turn on 4. Make sure only one light on the scale turns on. 5. Make sure the "lamp ready" light is on. 6. (If you test the diamond, turn on the number of lights corresponding to the interior temperature and weight of the diamond.) 7. (If you test other gems, it is better to calibrate the probe, method: place the probe vertically on the glass, then adjust the light to 5, then test the gems)
★ Notice: *No matter what gemstone you are testing, the probe needle and the tested object should be at a 90° angle. *When testing diamond, your right index finger should keep touching the metal panel on the back of the tester, while you do not touch the panel if testing other gemstones. *Do not test any metal. * Do not use a glove.
Product size: 16*4*2.2cm. Weight: 100g. Power required: 1 x 9V battery (not included). If you have any problems with the tests, please contact us, we would love to help you.
【High Accuracy Diamond Tester】This diamond tester is designed for fast, accurate and safe diamond testing, not harmful to diamonds.
【Easy to Use】Real Diamond will Emits sounds and lights >=9. Fake crystal, such as cubic zirconium ( CZ ), crystal, glass will be no sounds and lights <9.
【60X LED Magnification】60x led magnification with battery, suitable for gemstones, coins, antiques, stamps, reading, inspection, etc.
【Package Includes】1 x diamond tester, 1 x 60X Mini LED Magnifying,1 x user manual. This diamond tester uses DC9V battery (NOT included).
【Aftersales】Please read the instructions and detailed description before use. If you have any problem about the diamond tester pen, please feel free to contact us!
Perfect Combination: the package includes 1 piece of Jewelry tester and 2 piece of Jewelry loupe, which are complete and practical for you to test or observe diamonds, bringing you a good using experience.
Clear Screen & Audio Instruction Design: these high accuracy diamond testers are designed with a clear screen, so you can get the useful data quickly. The jewelry diamond tester is equipped with LED lights and audio instructions. As long as the tip is perpendicular to the test masonry and the switch is pressed, the result can be obtained.
Dual Function: The diamond tester can test the authenticity of diamonds(above 9), and can also test the hardness of finished jade crystal agate with a hardness value between 5-9.
Magnifying Glass Accessory: 2 pieces magnifying glass are provided, one is equipped with 60X and LED illumination. The other features 2 Lenses(30X 60X) and 2 LED lights. Clear magnification effect, refine surface, comfortable and natural to use. They can be applied for gems, jewelry, coins, stamps, watches, hobbies, models and observing other items you want.
Wide Application: Diamond test pen can be used for gems, coins, antiques, stamps, reading, inspection, etc. Diamond tester pen is designed for fast, precise and safe diamond testing.
High-precision testing: Using advanced electronic technology to quickly and accurately identify diamonds, moissanites and other gemstones. By accurately distinguishing between diamonds and moissanites, you can ensure that you are buying genuine jewellery
Easy to operate: no specialised skills required. Simply touch the tip of the pen gently to the surface of the jewellery and get the test result immediately. Green light indicates genuine diamonds, red light indicates possible synthetic diamonds or other gemstones
Precautions: The probe must be held at an angle of 90° to the object being tested, regardless of the stone being tested. When testing diamonds, the index finger of the right hand must always be in contact with the metal plate on the back of the tester, while other gemstones should not be in contact with the metal plate
Easy to carry: compact and lightweight design, easy to carry and use. Whether you are in a jewellery shop, a second-hand market, or on a trip, you can test diamonds anytime and anywhere
Quality Service: Providing good products and services for customers is our pursuit, if you have any questions, please feel free to contact us, we will provide you with the most satisfactory answer within 24 hours
Complete tool for diamonds: The package includes 1 piece of Jewelry tester and 2 piece of Jewelry loupe. An excellent diamond tester tool kit, suitable for handling any exposed or mounted diamonds and gems. and can also test the hardness of finished jade crystal agate with a hardness value between 5-9.
Clear Screen & Audio Instruction Design: these high accuracy diamond testers are designed with a clear screen, so you can get the useful data quickly. The jewelry diamond tester is equipped with LED lights and audio instructions. As long as the tip is perpendicular to the test masonry and the switch is pressed, the result can be obtained.
Simple to Use: 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).In providing fast and accurate results. You will be able to know in a few seconds whether an item is fake or not.
Accessory tools: 2 pieces magnifying glass are provided, one is equipped with 60X and LED illumination. The other features 2 Lenses(30X 60X) and 2 LED lights. Diamond test pen can be used for gems, coins, antiques, stamps, reading, inspection, etc. Diamond tester pen is designed for fast, precise and safe diamond testing.
Portable: Diamond Tester Pen and 30X 60X LED Lighted Loupe are small and can fit into any purse or backpack. They are a must have tool kit when you are going to a garage sale, flea market, swap meet, etc. Alternatively, its also a great tool to have when testing your own jewelry.
Highly Accurate Testing: Utilize advanced electronic technology for quick and precise authentication of diamonds, moissanite, and other gemstones. Ensures genuine jewelry purchases by accurately differentiating between diamonds, synthetic diamonds, and other gemstones.
Easy to Use: The Diamond Tester Pen is simple to operate. Just lightly touch the pen tip to the surface of the jewelry, and it will provide test results within seconds. Green light indicates a real diamond, while red light indicates the possibility of a synthetic diamond or other gemstone.
Applicable to multiple scenarios: In addition to testing diamonds, the Diamond Tester Pen can also detect moissanite and other gemstones. It offers various testing modes and functionalities to cater to your testing needs for different types of jewelry.
Easy to carry: The Diamond Tester Pen features a portable design, allowing you to carry and use it with ease. Its compact size and lightweight construction enable you to perform diamond tests anytime, anywhere, whether in a jewelry store, second-hand market, or while traveling.
NOTE: Our products are battery powered, with batteries, no charging cable. Low battery consumption(includes rechargeable batteries)
Make sure the tester probe needle is at a 90-degree angle with the tested object. Meanwhile, the right index finger must touch the metal panel on the back of the tester.
Do Not test any metal. * Do Not wear gloves. A user manual is included for hassle-free operation.
【High Accuracy】The Diamond&Moissanite Tester is designed to help you quickly determine diamond and moissanite from other fake stones
【User-Friendly】Diamond Detector is easy to operate, hold the meter(by placing your finger on the metal on the back) in 90 Degree position to insert to the surface of diamond, then Green light(diamond) or Blue light(moissanite) will appear on the indicator
【High-precision chip】Diamond Tester is able to detect metal, the inditor will appear orange signal if touch metal material. If without this function, other testers selling on amazon can indicate a real diamond when you unknowingly touch the setting even if the diamond is fake
【Ergonomic Design】Diamond Tester is designed with rubber paint finish, this device provides safe, non-slip comfort and control. It is also equipped with a fine elastic tipped probe for testing and identifying stones with small sizes. When the device stops working due to low battery, please replace the battery or use an adapter (not included) for charging
【Portable & Convenient】It's compact-sized design, it's easy to bring when you need it, where you need it. It also allows continuous use of up to 2 hours and quick probe warm up time of 25 seconds
Rechargeable Multi Function Flashlights – 6 Color Light : Can carry out jewelry appraisal, Antique collection, Porcelain research,Amber beeswax detection.
MULTIPLE LIGHTING MODES: Not only for indoor or outdoor lighting, But also Can easily find room stains， It can detect fungi in food and check if bills and banknotes have been counterfeited, Can be carried along to detect stains in your car or illuminate minerals, Body art， Finding scorpions.
USB Rechargeable Flashlight：Equipped with a USB charging line and the charging port is type-C, It only takes 4 hours to charge the flashlight fully, The use time can reach 4-10 hours. Equipped with a power indicator 25%，50%，75%，100%.
The flashlight is made of high quality aluminum alloy, Strong and durable. The flashlight It is 14 cm long and weighs about 120 g.
Warm Tips : Pls feel free contact us if you have any doubts about our Rechargeable flashlight.
Good Material - This electronic diamond tester pen is made of solid durable ABS housing, high sensitivity alloy probe, rubber protective cap, well heat-conducting plate.
Fast & Precise Measurement - A quick, accurate, safe way to distinguish diamond from the simulants, brings no harm to the diamond.
Easy Use - Turn on, wait for heating up ready, hold(finger on heat-conducting plate), use the probe to make 90-degree contact with the measured object.
Intuitive Design - Sound beep and LED lights straightforwardly indicates test result(beep & light: diamond, continuous buzzing sound: metal, no signs: simulants).
Portable Size & Leather Bag - compact, lightweight diamond tester, powered by 1 x 9V 006p battery, comes with a leather case, for easy store, carry.
Frequently Asked Questions (FAQ)
What is the best diamond detectors? It depends on your needs, but the top 3 products are generally the most balanced options.
How do I maintain it properly? It varies by model. The best approach is to follow the manufacturer’s recommendations (yes, reading the manual is worth it).
Where to buy it with confidence? Amazon remains a solid choice: wide selection, easy returns, and tons of user reviews—hard to beat.
Do I need a big-name brand? Not necessarily. Lesser-known brands can be surprisingly good, with well-designed products that rival top names—at a lower cost. Don’t overlook them just because the name is unfamiliar.
What are the most common pitfalls? A super low price might be tempting but could signal major compromises (build quality, reliability, nonexistent support…). Also beware of product pages with no reviews or vague comments. Spend a few minutes reading real feedback—this is often where the most valuable info is.
How is our ranking built?
We don’t claim to have a magic formula. In reality, it’s a blend of data—ratings, sales volume, review frequency—and observation. We watch for recurring themes in reviews, compare search trends, and yes, sometimes rely on our gut feeling. A great product isn’t just numbers. Our ranking aims to balance all of that: data, common sense, and a lot of time spent checking.
We analyze scores, sales frequency, genuine reviews (not just stars), and current search trends. Each model is rated using a consistent set of criteria. While it’s not perfect, it helps us stay fair and consistent. And we update our lists often, because products evolve—and so do we.
Why trust Topelio?
Topelio is an independent website—we don’t sell these products and we’re not tied to any brand. What drives us is clarity and usefulness. We aim to produce practical, readable, honest content. Our rankings are based on public data, complemented by our own experience. No shady partnerships or biased recommendations—just a genuine effort to save you time, and maybe money too.
Thanks for taking the time to read this guide. Choosing a diamond detectors might seem trivial, but it’s often more complicated than expected. Too many options, unclear product pages, and marketing promises that don’t help… That’s why we aimed to create a simple but solid comparison. With practical info, useful tips, and most importantly—a ranking based on reality. Take time to compare, read more reviews if needed, and choose based on your own priorities. What works for someone else might not be ideal for you. If this guide helped you, feel free to explore our other articles. We always try to add real value—without wasting your time. See you soon on Topelio.
