If you plan on buying diamond jewelry, you should have a diamond tester to make sure that you’re buying authentic diamonds. You shouldn’t just trust the jeweler or seller, even if they are a trusted brand. Always make sure that you’re buying authentic diamonds. Choose the best diamond tester from our list. We’ve based our picks on accuracy and how easy the tools are to use. Clarity of readings was also taken into consideration, as well as customer reviews.
1. Presidium Diamond Mate Tester (PDMT- C)
The Presidium Diamond Mate Tester (PDMT- C) may very well be the best diamond tester that’s pocket-sized. It determines the authenticity of diamonds instantly and works on both polished and unpolished gemstones. This diamond tester is capable of testing diamonds as small as 0.02 carats. It provides consistent, reliable results.
The display is clear and visible, making it easy to read the results with confidence. This diamond tester also comes with a protective carrying case. You can carry it in your pocket without worrying about damaging the diamond tester. The Presidium Diamond Mate Tester (PDMT- C) determines if a gem is a diamond based on its thermal properties.
Price: $129 on AAJewelry.com.
2. Luckystone Jewelry Diamond Tester Selector II Tool LED + Jewelry Loupe
This is one tool that is extremely effective in distinguishing between metal and stone. It makes a continuous buzzing sound when you accidentally touch metal instead of stone. The Luckystone Jewelry Diamond Tester Selector II Tool delivers accurate readings as a result. It has an easy-to-read LCD display and LED indicator.
Real diamonds cause the light to turn green. Fake diamonds don’t get a reaction from the light indicator. This diamond tester also has a large/small switch that tests diamonds at +/- 8 points. It operates on one DC 9V battery, but you’ll have to buy one separately.
Price: $19.99 on Amazon.com.
3. HDE High Accuracy Professional Jeweler Diamond Tester For Novice and Expert
Featuring a low battery indicator for accurate readings, this tool could be the best diamond tester for many jewelry buyers. It emits sounds to differentiate between different readings. The diamond tester has small and large switches for testing diamonds. It requires one 9V battery to operate.
The HDE High Accuracy Professional Jeweler Diamond Tester For Novice and Expert comes in a leather storage case. This storage case protects it while it’s not in use. It also enables you to take the diamond tester with you when you’re shopping. The HDE High Accuracy Professional Jeweler Diamond Tester also comes with a small testing tray.
Price: $13.99 on Amazon.com.
4. StillCool Diamond Tester II V2 Selector Gemstone Jewelry Gems Tool with Case
This portable diamond tester provides fast, accurate, and safe testing to determine if a gem is a diamond. It features an LCD display and an LED indicator. The tool has no reaction when a stone is fake. When the light is green, that means the gem is a real diamond. The StillCool diamond tester emits audible signs to assist with accurate testing.
This diamond tester has small and large switches at +/- 8 points. It makes a buzzing sound when it comes into contact with metal to increase the accuracy of readings. This diamond tester comes with a testing platform, user manual, and leather pouch. It’s powered by one DC 9V battery, which must be purchased separately.
Price: $14.99 on Amazon.com.
5. Btkuon 3in1 Diamond Gemstone Tester Selector II Gems Tool Test +60x LED Microscope Magnifier
The 3in1 Diamond Gemstone Tester Selector II is one of the best diamond testers that includes a microscope. It also comes with a tweezer, farmar, and jewelry pocket scale. Although this diamond tester is a 3in1 tool, it still conveniently fits in your pocket. The LCD display is easy to read for more accurate results. The Btkuon diamond tester has an energy saving auto-off function. This is helpful in case you forget to turn it off. In contrast to the previous items on this best diamond tester list, it’s powered by two AAA 1.5 LI batteries.
The 3in1 Diamond Gemstone Tester Selector II is easy to use, whether you’re a beginner or expert. It turns the diamond indicator’s light green if the gem is a diamond. The diamond tester also comes with a protective leather case so it lasts longer.
Price: $29.99 on Amazon.com.
6. HDE Jeweler Tool Kit Diamond Selector V2 Portable Tester + 45X Illuminated LED Loupe
Another good diamond tester that comes with a loupe is the HDE Jeweler Tool Kit Diamond Selector V2 portable Tester. It comes with a 45X illuminated LED Loupe. The tool accurately differentiates diamonds from other materials. The tester comes with a small and large switch for diamond testing. Similar to the other products on this best diamond tester list, it emits audible sounds to improve accuracy. The diamond indicator lights up if the stone is an authentic diamond.
The HDE diamond tester is powered by one 9V battery, which isn’t included. The 45X illuminated LED loupe is powered by a different set of batteries that are included with this product. The HDE Jeweler Tool Kit diamond Selector V2 Portable Tester + 45X Illuminated LED Loupe comes with a leather case. This helps keep it protected when you need to bring it with you other places.
Price: $14.99 on Amazon.com.
Final Thoughts on Diamond Testers
It’s important to look for diamond testers that have clear and easy-to-read displays. You don’t want a tester that’s difficult or confusing to read. You want to know with certainty whether or not a gemstone is a real diamond. Owning a high quality diamond tester will give you peace of mind when shopping for diamonds. The six tools listed above are easy to use, accurate, and are powered by batteries that are easy to find. Furthermore, most of the diamond testers on this list come with cases as well to protect them from damage.