Diamond Tester, Jewelry Diamond Tester Pen ＋ 40X Mini LED Magnifying, Diamond Selector for Novice, Thermal Conductivity Meter

You do not have to be a jeweler to know how to use this. Very easy to use. Just read instructions. I was surprised at the quality and value of the items. I bought mine after I had my ring resized. My diamonds looked so clean the I swore they switched them. LOL they definitely didn't. They just needed s good cleaning. I used this on all my jewelry and it works great!

It was used to test diamonds but gave the wrong results.

It works, but sometimes the lights aren’t lighting up on the side Is sometimes the beeping won’t stop even after I’ve put it away from the stone And I end up having to reset the machine It feels durable. It doesn’t feel like it’ll break very easily. And it seems accurate when it wants to work it’s not really hard to use . It’s one of those you get what you pay for and it’s not bad for its Price

Bought this at a great price, it was a little complicated to use. I tested various real and fake stones and it would always give me a different reading every time so its performance was a little confusing. Landed up buying a different one.

Good product for good price! Works good! You really need to know how to use it correctly!