Best Jewelry Diamond Testers of 2026

"I found this diamond tester to be very straightforward and user-friendly, even for someone without experience in jewelry. The LED lights are clear and easy to interpret, and its compact size makes it perfect for storage or travel. The build feels solid and it was well-packaged upon arrival. I think it's a great value for the price and would definitely recommend it for personal or basic professional use."

"After a bit of trial and error and checking the instructions, I got the tester working and found it simple to operate. My only small gripe is that the battery included with the device died quickly, but since it uses a standard 9V, replacements are easy to find. Despite this, I feel it works well and is reasonably priced."

"This little tester is lightweight, quick, and fits easily in my purse. I used it to check several pieces of jewelry and compared the results with an older tester I own; it correctly identified the stones. Since I often go to estate sales, this tool is very handy to have on hand."

"I've used this diamond tester on several pieces and found it to be surprisingly accurate for the price. It's straightforward to operate, and the included lighted magnifier is actually pretty decent. I like that it runs on a 9V battery, which makes it super portable for testing on the go. The instructions could use some polishing, but they’re still clear enough. Overall, I’d recommend this to anyone starting out or just wanting a quick way to check their jewelry."

"This tester has made it incredibly easy to distinguish between diamonds, moissanite, and CZ. The precise readings give me confidence in my jewelry purchases, and I love how comfortable and sleek the pen feels in hand. Its portability means I can test stones anywhere—it’s really elevated my experience, and I recommend it to anyone who wants to avoid being fooled by fakes."

"When I first tried the tester, it worked, but the tip had a small burr that affected contact. After carefully smoothing it out, the device performed as described. However, I noticed that the stone dish isn’t very practical and would suggest using tweezers instead. The lighted 60x loupe is a great bonus, even if it’s not ideal for every stone. Overall, it does the job, but I may upgrade to a higher-end model in the future."

"I have both real and fake pieces, and after using this tester for about half an hour, I can confirm it reliably distinguishes between authentic and imitation stones. Anyone who finds it inaccurate probably didn't follow the instructions. No issues or red flags—definitely a 5-star product."

"I tested my lab-grown diamond earrings and blood diamond bracelets, as well as a cubic zirconia necklace, and the device accurately identified each one. Great product for anyone wanting quick verification!"

"It's pretty entertaining for the price and gives me some peace of mind, but I wouldn't stake everything on the readings. If you want absolute certainty, it's best to consult a professional."

"As someone new to gemstones, I found this kit to be extremely convenient and beginner-friendly. The diamond tester is reliable, the scale measures carats precisely, and the magnifier makes inspecting stones simple. It's compact, rechargeable, and feels like a professional-grade set."

"I use this tool regularly for jewelry work and appreciate how fast and easy it is to operate. The size is ideal for travel, and the durable design holds up well. Definitely a great addition for anyone working with jewelry."

"Having wanted a diamond tester for a while, I’m impressed with how efficient and accurate this device is. I tested it on both real and fake stones and it performed flawlessly. The built-in flashlight and UV light in the magnifier are a great value bonus."

"I tested both real and fake diamonds, and I was impressed that this tester could clearly distinguish between genuine and imitation stones. For diamond verification, I would rate it as perfect."

"The tester arrived sooner than expected and was well-packaged. So far, it has been very accurate, although I haven’t tried the scale yet. Everything looks solid."

"Unfortunately, this product didn’t meet my expectations. I don’t have the time to return it, and I wouldn’t recommend it to others. I think it’s something Amazon should consider removing from their listings."

"I was able to verify which jewelry pieces were genuine and which were imitations with this kit. It has helped me save a lot of money that would have gone to appraisers."

"The diamond tester gives reliable and repeated results when I check between my expensive stones and cheaper alternatives. Plus, the magnifier is of surprisingly good quality."

"I found this kit to be a solid purchase for checking my diamonds and gold. The materials are good, and it does exactly what I need it to do."

"I found this diamond tester to be very accurate and simple to operate. After following the instructions, I tested it on both real diamonds and CZ stones, and it delivered reliable results. The lightweight design also makes it convenient to use, and I'm extremely satisfied with this purchase."

"Using this tester has been a fun and empowering experience. The clear instructions made it straightforward, and now I check everything from jewelry to random objects—just for the thrill! The device is precise for real diamonds, and the included loupe is a bonus for inspecting details. Perfect for anyone with a curious mind or a suspicious relative."

"The tester did exactly what I needed—it was simple to set up and gave me confidence in identifying real diamonds. Once I read through the directions, it was easy to use. Highly recommend for quick and accurate diamond checks!"

"I found the Hqdz Diamond Tester Pen exceptionally reliable and easy to use, even as a beginner. It powers on and calibrates quickly, and the lights and beeps make readings obvious. I tested several real and fake diamonds, and it was spot-on every single time—no jumping results. The rechargeable USB-C feature saves me from battery changes, and the included 40x and 60x magnifiers with UV and LED lights make examining stones a breeze. My only wish is for a protective case for the tester itself."

"This diamond tester kit combines accuracy and simplicity perfectly. The thermal conductivity sensor and UV mode work together to instantly spot real diamonds and weed out fakes. The LED display is bright and responsive, and the UV detection really highlights natural fluorescence. The 60X microscope and 40X loupe are both top-notch for inspecting jewelry or even coins. Compact, rechargeable, and precise, this is a must-have for anyone serious about authentication."

"I noticed that this tester only seems to recognize diamonds—it doesn't pick up other gemstones at all."

"I'm really impressed with how simple it is to operate this diamond tester. The instructions are clear and it even includes guides in several languages. The readings are accurate and it feels like a great value for the price. I like having it around for quick checks on my jewelry."

"This tester is both fun to use and reliable. The lights and sounds make it easy to tell real from fake stones, and it's lightweight, which makes it comfortable to hold. Accuracy has been spot on in my experience, and it's definitely a handy tool to keep nearby."

"Although I had to watch the tutorial more than once to get the hang of it, the device really does work. Of the five stones I tested, all readings matched their actual type, which gives me confidence in its usefulness."

"I found this diamond tester to be super easy to use, even for someone without much experience. It feels sturdy and delivers quick, reliable results. The included magnifying glass is a great touch, making it fun and reassuring to check my jewelry."

"This tester offers outstanding value for the money and is very accurate and functional. It’s easy to operate and ideal if you’re ever unsure about your stones. I’m impressed with the quality and straightforward instructions."

"Although I identify as being a bit more advanced than a beginner, I experienced some difficulty operating this tool at first. Still, it does work, and with a little patience, I managed to get the hang of it."