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5 Best Gem Testers of 2026

Last Updated - 2026/04/02

1
Best Choice

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

PRESIDIUM

Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones

PRESIDIUM

CA$508.85

More Details
Main highlights
- VERSATILE AND RELIABLE | Consistent and reliable results every time. Identifies diamonds/moissanites
- THINNEST RETRACTABLE PROBE TIP I PGT II features the industry’s thinnest retractable probe tip
- SIMPLE & EASY TO USE | Clear and easy-to-read analog dial; Can differentiate 16 types of gemstones
- INDUSTRIES MOST TRUSTED | Gemstone tester redesigned to be more compact, sturdy and portable
- INCLUDED ASSISTED THERMAL CALIBRATION | Now easily self calibrate your device to your testing environment
CA$508.85
2

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Grobet

Grobet 56.926 SmartPro Gem-Eye I LED Indicator Gemstone Tester

Grobet

CA$297.70

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Main highlights
CA$297.70
3

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Molo

Best Version Diamond Tester and 60X LED Magnifying Glasses Jeweler Tool Kit Combo，for Novice and Expert - Diamond Selector 9V Battery Included

Molo

CA$28.80

More Details
Main highlights
- ✔【Simple to Use】Molo 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) and If the stone is fake, crystal or cubic zirconia, the tester will not beep. To determine the clarity of a diamond use 60X LED lighted Loupe, magnifying glasses.
- ✔【Portable】Molo Diamond Tester Pen and 60X LED Lighted Loupe each comes with its own convenient carrying cases. Both items are small and can fit into any purse or backpack. Molo’s Diamond Tester Pen and 60X LED Lighted Loupe combo is 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.
- ✔【Intuitive Design】Molo Diamond Tester Pen comes with LED lights and audio indication. During a test, if the stone tested is a diamond, the LED lights will light up as the stone passes each test conducted by the Diamond detector. Once our Diamond Tester Pen has completed all of its tests, the pen will make a beep sound as well as show a row of fully lite LED lights.
- ✔【Fast Results】Molo’s Diamond Tester Pen is design to deliver fast, accurate results. You will be able to know if something is fake in a matter of seconds.
- ✔【Application Range】Industrial Purpose, Circuit Board And Printing , Industry, Medicine, Gardening, Coin, Diamond,Stamp, Jewelry, Appraisal, Education, Geography, Home And Office.
CA$28.80
4
$Gemstones Refractometer Gemstone ldentification Gem Refractometer Kit for Jeweler Watch, Portable Jeweler Tester Tool Gemological Gemstone$

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Fdit

Gemstones Refractometer Gemstone ldentification Gem Refractometer Kit for Jeweler Watch, Portable Jeweler Tester Tool Gemological Gemstone

Fdit

CA$104.88

More Details
Main highlights
- Strong Practicality: The primary use of the portable gemstones refractometer is to measure the angle at which light is bent or refracted through the stone.
- Specially Designed: This refractometer is specially designed to measure the refractive index of gemstones and materials.
- Quick Identification: The refractometer can quickly and accurately identify a variety of single and double gemstones, helping to identify diamonds, moissanite, etc.
- High Accuracy: Professional gemstones refractometer has high accuracy, small size, easy portability and easy
- Easy to Read: The jewelry gemstones refractometer has a clearly visible display for easy reading.
CA$104.88
5
Best Value
32% Off

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

HMKIS
32% Off

HMKIS Diamond Tester Pen, High Accuracy Jewelry Diamond Tester＋ 60X Jewelers Loupe, Professional Diamond Selector for Novice and Expert, Thermal Conductivity Meter

HMKIS

CA$25.99

CA$37.99
(32% Off)

More Details
Main highlights
- 【Two Hands Operation】All test must be done by two hands! one for hold the diamond and one for the diamond tester. As for the hand hold diamond tester, you have to touch the electricity conductive panel on the back of the unit.
- 【Moissanite & Real Diamonds】:This diamond tester II can just distinguish diamond and fake diamond,but CAN NOT distinguish Moissanite & Real Diamonds
- 【Metal and Other Alert】When Testing metal, it will emits beeping-beeping-beeping in a high frequency,5times/second. The thermal conductivity of the metal is very high and can give the same indication as a diamond with most thermal probes.)This Diamond Selector II has a metal Alert Buzzer to warn you when touches metal. If you hear the Metal Alert buzzing sound,re-touch the probe tip so as to touch only the tested stone.
- 【Magnification】: 60X led Magnification with batteries ( Small microscope ). For Gems, Coins, Antiques, Stamps, Reading, Inspection etc.
- 【Initialization】After powering on, turn the wheel to keep 4 green lights on to finish the Initialization. Otherwise you will get inaccurate results.
- 【For Imitation】For Imitation stone, there will be no sound, and the red lamp won’t light. Imitation stone may like cubic zirconium ( CZ ), crystal, glass and so on.
- 【For Diamond】For diamond, there will >=8 lights on and emits BEEPING in a low frequency -1 time/second.(the bigger the size of the stone is, the more pieces of the red lamp box of the level meter light up)
- 【Bare Hands Operation】: All the tests must be done by your bare hands. If you put on your gloves, the metal alert will not function since a normal moisture levelof your hands is necessary for operation.
CA$25.99
CA$37.99 (32% Off)

5 Best Gem Testers of 2026

Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones

Grobet 56.926 SmartPro Gem-Eye I LED Indicator Gemstone Tester

Best Version Diamond Tester and 60X LED Magnifying Glasses Jeweler Tool Kit Combo，for Novice and Expert - Diamond Selector 9V Battery Included

Gemstones Refractometer Gemstone ldentification Gem Refractometer Kit for Jeweler Watch, Portable Jeweler Tester Tool Gemological Gemstone

HMKIS Diamond Tester Pen, High Accuracy Jewelry Diamond Tester＋ 60X Jewelers Loupe, Professional Diamond Selector for Novice and Expert, Thermal Conductivity Meter

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