GemOro UltraTester 3+ Diamond Tester | Test Diamond, Moissanite, White Sapphire Gemstone | Precision Tool with Expert Professional Reading & Accuracy
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Availability:
In Stock.
Arrives
Wednesday, Apr 22
Features
- STONE IDENTIFICATION: This new enhanced testing technology is a breakthrough in the identification, detection, and separation of diamonds from other materials such as CZ, moissanite, and white sapphire. This technology has the capability to identify stones with low conductivity, allowing accurate detection and separation of diamonds from other materials. It evaluates stones using cutting-edge scanning techniques and advanced software analysis, ensuring a highly accurate test result.
- LED STONE ILLUMINATION & DETECTION: This is a high-performance diamond tester with LED stone illumination and UV fluorescence detection. It uses a unique retractable probe tip that is designed for enhanced durability. The LED stone illumination will help you see the subtle nuances of the diamond, such as clarity, while the UV fluorescence detection allows you to detect any potential diamond treatments. This is the perfect tool for diamond grading, authentication, and identification.
- POWERED BY USB Type-C: This versatile device comes with multiple power sources. It can be powered by either your USB Type-C cable, rechargeable NiMH batteries, or AAA Alkaline batteries with a battery-saving auto-off function. It includes (3) user-replaceable AAA NiMH rechargeable batteries, a universal multi-voltage 100V240V AC adapter / charger cube, and a premium USB Type-C cord. You get to choose the power source that works best for you, and the device will be ready when you need it!
- DESIGNED IN THE USA: The sleek ergonomic shape of the ULTRA TESTER 3+ allows it to comfortably rest in your hand, and its LED stone illumination makes it even easier to see what you're testing! Designed in the USA and recommended by Charles and Colvard. It comes with 2-year limited replacement warranty on probe tip - Lifetime warranty on the electronics. This tester is not intended for Emerald.
- GEMORO TESTERS: GemOro is a leading manufacturer of gold and platinum testers, as well as diamond, moissanite and white sapphire testers. They are trusted by professionals and hobbyists alike. GemOro's testers are known for their accuracy, reliability, and ease of use.
Product Dimensions: 6.75 x 1.75 x 1 inches
Batteries: 3 AAA batteries required.
Item model number: 0776
Is Discontinued By Manufacturer: No
Item Weight: 11.3 ounces
Department: Unisex-adult
Manufacturer: GemOro
Date First Available: July 20, 2010
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Apr 22
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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- Financing through Apple Pay
Learn more about financing & leasing here.
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Top Amazon Reviews
I replaced an outdated diamond tester with this and I love it!! You need to read and follow the instructions carefully before you start. It takes a little practice to hold/use the tester correctly to get an accurate reading. It becomes easy and fun to use once you get the hang of it. Other testers I have tried before detected moissanites as diamonds. I picked this Gemoro tester for its reliability in distinguishing the two.
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Reviewed in the United States on January 30, 2022 by CINDY C.
First the probe tip cap broke, and the probe tip came off. I got it working but the chargeable batteries didn’t work, i place 2 set of different brand new batteries and still did not work, only works with the provided USB cable and its power supply adapter, i know for the cap my warranty is useless i take the loss but bad product, i regret not going with the same brand of tester i’ve been using for more than 20 years, better get Presidium tester, like old saying if it isn’t broke don’t fix it.
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Reviewed in the United States on July 6, 2022 by Mauro
So far great, still checking and testing unit.
Reviewed in the United States on November 14, 2025 by James Tanner
The GemOro UltraTester 3+ works well for testing natural diamonds, moissanite, and white sapphires with precision. However, I’ve noticed it struggles with lab-made diamonds, consistently showing them as moissanite. While it's a reliable tool for natural stones, keep in mind that it might not provide accurate readings for lab-grown gems. Overall, it’s useful but limited in this regard.
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Reviewed in the United States on October 12, 2024 by tony Ng
Wow. Simple and very easy to use. Thanks Rich
Reviewed in the United States on March 31, 2024 by qiuck
Got the GemOro Ultra Tester II on time as promised. The tester works OK, but the tip cone indicator does not work. Sound and LED display is OK, so the main functions are intact. It is easy to use and carrying case is fine. No response from their customer service on the cone indicator issue. In my experience, OK product but quality control could be better.
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Reviewed in the United States on June 21, 2013 by KM
I love this tester! So far, it works perfectly, has identified all known quantities and I feel confident using it to identify stones that need testing. It's a little pricey but I'm willing to pay it to know which stones are diamonds and which are moissanite.
Reviewed in the United States on July 10, 2019 by Dawn B Racca
Had several of these all did well except last one is a disaster...wont work correctly. Junk out of Box.
Reviewed in the United States on June 9, 2025 by Dean Heeter