The 6 Best Good Diamond testers (2023 reviews)

The hmkis good diamond tester is long-lasting, rigid and fits well with your regular usage like a dream. It is a kind of diamond and can be distinguished. It can be distinguished, the hardness of jade and diamond of different materials is different, and the equipment can be distinguished. You will love the fact it actually comes with its kit, cover cases, a battery, and a lil Flashlight/UVLight Microscope. It is easy to use and comes complete with understandable instructions and guides for every gem and size.

This diamond tester is a great deal with the jewler scope and rechargable 9v included. This device cannot test metals, so it cannot test silver. If even slightly tilted, it will give no reading or alert as diamond. It can tell you if a stone is a real diamond or not. It is definitely a must have if you buy diamonds or moissanite online & don’t want to get scammed.

Why We Like This:

Comes with a detector for currency
Easy-peas for someone who is not a jeweler to test their diamonds
Great and reliable source of authentification
Come in a cardboard storage box for extra protection

Best For Testing watch crystals: Hqdz Good Diamond Tester

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For a low asking price, hqdz good diamond tester has managed to overwhelm their customers by packing as many features as they could. There’s other kits for gold, but they usually contain a series of individually bottled testing acids, testing needle, and stone. It includes 1 standard 9v battery, which is super easy to use and the battery. The tester is relying on thermal conductivity and both diamonds and metal conduct heat similarly. It is great for testing watch crystals.

The test takes a few minutes, please turn off the power after the test is complete. There’s a bar of LED that lights up if it’s a real diamond and it beeps. It is very easy to use and 100% accurate. It includes this one is super easy to use and the battery.

Why We Like This:

Great tool to have if you own any jewelry
Diamonds are tested either thermally or electrically
Great tester to verify real or not real

Best For Testing: Presidium gemstone Tester

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Next on the list, we've got yet another tester that manages to win our hearts. It's the presidium gemstone tester and it's widely considered as one of the best convenient tester you can buy. It is a must have if your hobby involves gemstones. The Presidium Gem Tester II (PGT II) features a clear and direct analog display for a quick way to identify diamonds/moissanite and separate up to 15 common colored gemstones from one another based on their thermal conductivity. It reads cubic zirconia as glass, which is great, since there are so many cubic zirconia fakes from India and China.

This tester uses thermal conductivity. It can test only crystalline stones, not opaque. There is an opening under the device that holds two AA size batteries. It's a must have if your hobby involves gemstones.

Why We Like This:

Good for differentiating diamonds and few other gemstones
Delivers what they promise

Best For blue topaz: Presidium Good Diamond Tester

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Next on the list, we've got yet another tester that manages to win our hearts. It's the presidium good diamond tester and it's widely considered as tester that has the most suitable features. This is great for Peridot, Blue Topaz, and Aqua Marine gem stones. It is developed to distinguish between diamonds and its other simulants using the principles of thermal conductivity. It features the industry’s thinnest retractable probe tip. It can be anything from a different stone that's been colored, all the way to colored/dyed glass. It has play back and forth.

This gemstone tester is limited in that it can't tell you whether a gem is lab-created or natural,it makes no distinction in that regard. Even with both tools, it takes a keen eye, and training to truly know what you're looking at. The gem tester will warn you with an audible alarm if you touch metal. It comes with a soft case.

Why We Like This:

Good product, easy to calibrate and accurate
Redesigned to be more compact, sturdy and portable
Affordable, portable and easy to use, but has accuracy issues
Come in colors that can imitate a lot of natural stones

Best For multiple types of gems: Gemoro Good Diamond Tester

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The gemoro good diamond tester might be a relatively new release, but it's still nothing short of impressive this year, thanks to multiple price cuts and added new features over the past few months. This unit tests thermal (heat) and electrical conductivity. The ultra tester 3 + glowing light bar / probe tip cone glows pink for white sapphire detection. It takes a little practice to hold/use the tester correctly to get an accurate reading. 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. It becomes easy and fun to use once you get the hang of it. The tester will read it as Moissanite or even Sapphire. It will test them as natural diamonds. It is good for flea markets.

Why We Like This:

The ultimate tester for diamond fraud protection
Tests for diamonds, moissanite, and white sapphire
Detects the widest range of moissanite, including forever one moissanite
Gemoro protective ballistic nylon carrying case

Best primary Tester: Smartpro Good Diamond Tester

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The smartpro good diamond tester's superior materials makes sure that it ages well with use. It is a remarkable designed gemstone tester with color estimator display for smoothly and seamlessly testing your precious stone and diamond. It is developed to distinguish between diamond and its other simulants using the principles of thermal conductivity. It is also used for faceted stones indoors. It is great for determining whether or not a gem is diamond, topaz, crystal glass, etc. It is easy to use and not too difficult to understand.

It is designed with USB connection to probe and very intuitive operation. It also has a fantastic little manual for which the other unit does not. It will detect lab created gems, and naturally made gems.

Why We Like This:

Needle points to glass just by waving the pen around
Best used for faceted stones indoors
Identifies metals, simulants and diamonds instantly
Portable tester that can be used anywhere