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Diamond Tester Comparison - May 2025
7 Best Diamond Tester In the UK
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
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Overview: Diamonds are an enduring symbol of love, luxury, and value. Whether you're a professional jeweler or a consumer looking to purchase a diamond, it's important to know how to identify and evaluate diamonds accurately. With the right diamond tester, you can make sure you're getting a quality product. Read on to learn more about the different types of diamond testers and their pros and cons.
JZK Portable Electronic Diamond Tester Pen for Diamond, Sapphire, Ruby, Crystal, Agate, Jade, gems Multi Gemstone Precious Stones Hardness Test Tool, Diamond Selector II V2
Model
Electronic Jewelry Diamond Tester Pen - Professional Diamond Detector with 2Pcs 30X 60X Magnifying Glasses and Mini Led Foldable Magnifying
Model
ARCELI Diamond Tester Pen-High Accuracy Jewelry Diamond Tester＋60X Mini LED Magnifying, Professional Diamond Detector for Novice and Expert, Thermal Conductivity Meter
Model
Diamond Tester Pen, Portable Diamond Selector High Accuracy Electronic Diamond Tester Tool for Jewelry Jade Ruby Stone with 2Pcs 30X 60X Magnifying Glasses Mini Led Foldable Magnifying
Model
2 in1 Moissanite and Diamonds Tester, High Accuracy Diamond Tester Pen for Non-Diamond, Synthetic Moissanite, Genuine Diamond Detector Selector
Model
High Accuracy Diamond Tester Pen With LED Indicator Light and Sound Prompt, Portable Electronic Professional for Novice and Expert, Sapphire/Ruby/Crystal
Brand
HOMYY
Brand
JZK
Brand
CDIYTOOL
Brand
ARCELI
Brand
YWNYT
Brand
luolety
Brand
DUPELEC
Reviews
720 reviews
Reviews
8,540 reviews
Reviews
1,028 reviews
Reviews
324 reviews
Reviews
244 reviews
Reviews
-
Reviews
64 reviews
Features
Worth the money
9.8
Worth the money
8.6
Worth the money
8.6
Worth the money
7.4
Worth the money
7.0
Worth the money
7.0
Worth the money
7.0
Simple to use
9.6
Simple to use
8.6
Simple to use
8.4
Simple to use
7.6
Simple to use
7.9
Simple to use
7.2
Simple to use
7.0
Precision
9.4
Precision
8.6
Precision
8.4
Precision
7.2
Precision
7.0
Precision
7.0
Precision
7.0
Tech Specs
item weight
10 g
item weight
90 g
item weight
230 g
item weight
-
item weight
240 g
item weight
100 g
item weight
130 g
package dimensions
-
package dimensions
22.6 x 15.6 x 3.2 cm 90 g
package dimensions
20.6 x 12.8 x 3.9 cm 230 g
package dimensions
-
package dimensions
19.5 x 8.6 x 6.6 cm 240 g
package dimensions
3 x 2 x 1 cm 100 g
package dimensions
19.2 x 5.8 x 3.6 cm 130 g
customer reviews
4.0 4.0 out of 5 stars 180 ratings 4.0 out of 5 stars
customer reviews
4.0 4.0 out of 5 stars 2, 135 ratings 4.0 out of 5 stars
customer reviews
4.1 4.1 out of 5 stars 257 ratings 4.1 out of 5 stars
customer reviews
-
customer reviews
4.0 4.0 out of 5 stars 61 ratings 4.0 out of 5 stars
customer reviews
-
customer reviews
4.1 4.1 out of 5 stars 16 ratings 4.1 out of 5 stars
Warm tips:gems must be clean, dry and at room temperature.when doing test, transferred to the first or second grid.
The thermal conductivity meter is designed and manufactured according to the thermal conductivity of diamond. It is specially used for the identification of the true and false of diamond.
Simple calibration for stones of various sizes.Accurate and reliable reading.
Light weight, matched with a convenient carrying case.Detailed user manual is included in the package.
LED light and audio result indication.The red light will be showed and the audio indicator will ring if the stone is real diamond.
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9.8
2
JZK
JZK Portable Electronic Diamond Tester Pen for Diamond, Sapphire, Ruby, Crystal, Agate, Jade, gems Multi Gemstone Precious Stones Hardness Test Tool, Diamond Selector II V2
8.6worth the money
8.6Simple to use
8.6Precision
Why we love it
Tests multiple gemstones including diamonds, sapphires, and rubies.
Clear results with lights and sound for easy identification.
Portable and lightweight, ideal for on-the-go testing.
Main highlights
★ 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.
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.
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.
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)
*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.
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9.7
3
CDIYTOOL
Electronic Jewelry Diamond Tester Pen - Professional Diamond Detector with 2Pcs 30X 60X Magnifying Glasses and Mini Led Foldable Magnifying
8.6worth the money
8.4Simple to use
8.4Precision
Main highlights
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.
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.
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.
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.
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.
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Our ranking system
The TopChoice.co.uk Team selects top-of-the-line items from a wide selection and conducts rigorous evaluations on almost all the products available on the internet. We rank each product based on how well it matches our criteria. We can ensure that the product is well-tested with the help of our expertise, experts, and artificial intelligence technology. TopChoice.co.uk requires consistent care for the products we review, ensuring that our assessments are always accurate and up to date.
Features
Our team of experts analyzes key attributes, capabilities, significance, and many more depending on the type of product to determine its effectiveness.
Consumer Reviews
We ensure an evaluation of the ratings using references all over the internet for each product. With the help of our AI technology and professional review teams, we give weight to the worth of individual user experiences.
Popularity
Popularity is an important criterion in choosing a product. Several factors contribute to the popularity of the products on our site, including prestige, relevance, reputation, news, and more.
Value for money
TopChoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.
When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
Value for money
TopChoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.
When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
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9.8 
9.9
1HOMYY
Easy to carry and use.
