
Works, functional and accurate, despite of its high price. I love the rechargeable batteries, but concerned about the thought of how to replace when batteries no longer recharge. The tip cover is somehow tricky to be removed, being careful not to damage the tip. The green light takes a while to light up before instrument can be utilized. Fortunately, the stone to be tested remains stationery and does not walk away.
Been doing this for over 15 years, One of my favorite testers. You can hit all the small ones with this!!
This works like a charm. I found out the diamond earrings that I bought at Kohls are not diamond, though. That makes me mad. But all of my other diamond register perfectly. It's very easy to use.
Very happy with this tester. So far, works very well. Accurate. I researched many before choosing this one. Same one I've seen in jewelers' shops and studios. Worth the $$
I use this a lot.

Feature Product
- Included rechargeable batteries and AC adapter
- Pocket sized (very portable)
- 1 Year Factory Warranty
Description
For diamond testing results that are fast, easy, and reliable, this is it. Verses the sub-standard tester model that isn't backed by the reliability and stability of Presidium Instruments. Sadly, most testers don't meet the basic qualifications of a good gem tester: ease, reliability, and speed. Luckily, the Presidium DiamondMate-C Electronic Diamond Tester meets and exceeds these qualifications.Easy visual lights and audible beeps indicate results in a way that's simple enough for anyone to understand. Simple to use and reliable because precision results are always a guarantee with its proven thermal conductivity testing method. The very low power consumption also gives you the reliability of prolonged use without having to worry about the power supply. It's fast because the results of a test are instant and there is zero waiting time in between tests. All of these features put the Presidium DiamondMate-C ahead of the game. For added user convenience, the DiamondMate C features a built-in metal detector that generates a distinct and audible beep when contact is made with metal.
Works amazingly. Glad to have it as a reporting tool.
It works perfectly and serves all my needs when diamond testing.
This is the easiest way to determine a diamond, and it works flawlessly!
As advertised
Excellent Quality. Works Well and Would Highly Recommend.




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