StillCool Diamond Tester, High Accuracy Diamond Tester Pen, Diamond Tester Professional, Diamond Detector Gem Tester Gemstone Gemstone Tester, Black
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This item is eligible for return within 30 days of receipt
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Availability:
In Stock.
Arrives
Sunday, Aug 24
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Features
- Intuitive Design Our diamond tester features an LCD display and LED indicator make it easy to read your precise testing results.
- Effortless Testing No need for a professional - the StillCool Diamond Tester Pen is easy to operate. Just turn it on, lightly press the tip to the gemstone, and wait for the beep to know if it's real or fake.
- If it's Real DiamondThe professional Diamond Tester will lighted up over 9 and emits audible sounds. No reaction means the stone is a fake crystal or simulant like cubic zirconium (CZ).
- Quick and Safe Designed for quick, precise, and safe diamond testing, this diamond selector tester ensures that there is no harm to diamonds during the testing process. providing accurate results every time.
- Convenient Package The Diamond Tester is battery-powered by a standard 9v battery (not included), and the package comes with a leather pouch case, testing platform, user manual and accurate diamond tester pen.
Brand: StillCool
Power Source: Battery Powered
Style: Electronic
Color: Diamond Tester - Black
Item Weight: 110 Grams
Brand: StillCool
Power Source: Battery Powered
Style: Electronic
Color: Diamond Tester - Black
Item Weight: 110 Grams
Min. Operating Voltage: 9 Volts (DC)
Measurement Type: Ohmmeter
Manufacturer: StillCool
Package Dimensions: 7.48 x 2.2 x 1.42 inches
Item Weight: 3.88 ounces
Item model number: STE13420001
Is Discontinued By Manufacturer: No
Date First Available: February 16, 2017
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Aug 24
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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Top Amazon Reviews
Color: Diamond Tester - Black
I liked that it did let me separate my wife's jewelry stash into diamond and not diamond piles. She passed away a year ago without us ever going over her jewelry so that I would what was what. The device is a little awkward to use since you must be touching the jewelry with one hand and holding the tool in the other. If you are going to test small diamonds in their settings I suggest you use a loupe so you can more easily get the probe onto the stone itself. Since you are measuring heat transfer you really must have the probe perpendicular to the diamond to insure the heat is properly transferring. And, you must insure the stones are clean since a film of dirt and oil can impede the heat transfer and lead to an incorrect reading.
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Reviewed in the United States on April 29, 2024 by Kindle Customer
Color: Diamond Tester - Black
1 Don't believe reviews that say this item does not work. It works perfect for me. 2 Tested Diamond, Moissanite, Ruby, Tanzanite, Topaz, London Blue Topaz and Cubic Zirconia. All the readings were perfect. 3 Set at 4. Diamond and Mossanite blew red, other precious stones 6 or 7. Cubic Zirconia did not move. 4 I don’t have an expensive machine to compare this to, but for me it identified all the stones I tried it on. 5 Make sure your fingers are on the metal plate. 6 IMPORTANT Diamond ( hardness 10) and Moissanite ( Hardness 9.5) tested the same. So don’t use this to validate authenticity. 7 Yes, I recommend it and would purchase it again.
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Reviewed in the United States on December 22, 2022 by robert
I received a few days ago and put it through some tests. I have some (quite a lot) of antique rings, most with stones that I wanted to check... honestly, I wanted to get an idea of which were garnets and which were rubies. Turned it on and waited for it to warm up, looked at the back to see what the calibration rates were and to calculate C to F. It's much easier to test jewelry with the tester by holding it in your hand, and make sure to keep a finger on the metal pad on the back. I found that with diamonds the testing was the quickest, the bars just shot right up the tool; testing other stones took a little bit longer for me as sometimes there was a pause before an extra bar showed up. I tested diamond chips and various sizes ranging from .05 to a .25c old European cut , everyone tested as a diamond... I have one piece of paste on a pin that I also tested, no movement whatsoever. Another thing I noticed was that it didn't matter if I had the calibration set for a larger stone (2 bars) when I tested diamonds, they shot all the way up regardless. It does matter if you are testing gems that aren't diamonds though. After that I moved on to the sapphires, I have white/blue synthetics, a couple of star sapphires, a natural white and a 1ct blue... all tested with 4 bars added to the calibration (not sure what would have happened if I had a really small one though and used the 8 bar to begin with). I also tested a stone that I thought was glass that I had on a great looking 10k ring. This stone was really dull and ugly, and around 1/3c... calibrated the tool at 4 bars and to my amazement it went up 4 bars. After soaking the ring in a glass of warm soapy water and then cleaning it with a toothbrush, I was excited to see how much it sparkled, no fire but certainly a beautiful stone and comparable to my natural white sapphire. I also tested a few loose small stones I have and found that it was almost easier to test them while holding rather than using the stone holder. On to the rest of what I found: When testing , Rubies +4, Sapphires +4, Amethyst +2, Emeralds & Garnets +1 (Members of the Beryl family have a very wide range of conductivity, so your results could be different depending on origin) Opal +0, {onyx, tigereye, agate, bloodstone, carnelian, moonstone} +1, Hematite +2. I also found one or two stones that I still can't identify but definitely narrowed down what they might be, found out that the purple stones in a turn of the century carved gypsy setting were pyrope garnets rather than the amethysts I thought and realized that two of the lower end rings I thought had glass/paste actually had gems on the lower end of the range. I will also add that just as this diamond/gem tester won't differentiate between mined diamonds and lab-created diamonds, it gives the same +4 on the mined rubies in my Edwardian jewelry as the synthetic ruby of a 1950's ring. All in all I like it a lot, although it can be a bit cumbersome at times. The cap fits on it well and keeps the tip protected along with the case. Just keep an eye on where the bars are after each test because sometimes you may have to adjust it back down a tad. I was usually testing the non-diamond gemstones a couple of times due to a slower bar time. I'll update further on the longevity.
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Reviewed in the United States on May 20, 2021 by Ivan's girl
Color: Diamond Tester - Black
It’s been hit and miss. If you let it touch anything metal it will go off like diamond. Meaning it’s tricky to test smaller diamonds as it’s incredibly difficult not to touch the settings. Though I’ve tested it on known CZ and sapphire and it hasn’t given a positive result, but you must make sure you are only touching the stone.
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Reviewed in the United States on January 9, 2023 by Carla
Color: Diamond Tester - Black
It did not seem to work. I was going to return it until I read someone’s comment about removing the black protective tip. Once air removed the black tip cover it worked as it should. Maybe put mention of this in the paperwork as the tip cover looked to be part of the tip itself.
Reviewed in the United States on December 21, 2022 by Gift shopper PB
Color: Diamond Tester - Black
I was impressed by the way it looks however I test real diamond as well as metal nickels dimes, it all showed real diamond..
Reviewed in the United States on March 8, 2025 by Vincent Jackson
Color: Diamond Tester - Black
As long as you follow the instructions it works! Was able to confirm with this tester that I had a diamond. Only complaint was product description wasn’t clear that it didn’t come with a 9v battery like some other diamond testers do. Was able to dig one out of an old detector so I didn’t have to buy one.
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Reviewed in the United States on September 16, 2023 by Samantha Potter
Color: Diamond Tester - Black
Tried this out on known diamonds and glass,paste etc. Found the diamond every time. Works well, great for the price.
Reviewed in the United States on July 22, 2023 by BIG KAHUNA