Diamond Tester,High Accuracy Jewelry Diamond Tester Professional Diamond Tester Pen Jeweler Tool for Novice and Expert - Diamond Selector II 9V Battery Included(Black Diamond Testers)

This diamond tester works very well, it is affordable, the battery lasts long, and it is very user friendly. I am very satisfied with my purchase.

Very interesting piece of equipment. There's a learning curve, but it won't take long to get the hang of it. Steady hands are a bonus. Once others know you have it, you will probably be asked to "check this out for me". It's practical and fun and often a conversation starter. I've had mine for years and it still works as expected. Be sure to take the time to read your instructions.

It took a bit of trial and error and re-reading the detailed instructions to get it to work. But once we figured it out, it's very easy to use. The one main complaint is a minor one: the battery that came with the Diamond Tester died after just a few minutes of use. Fortunately, it's a common battery (9V) and we have spares, so we were able to get it up and running again. Despite the challenges, it seems to work well and is reasonably priced.

The media could not be loaded. I inherited a lot of jewelry and I needed a way to see if it was all real or not. I used this diamond tester on around 25 pieces of jewelry that I already owned and it was 100% correct on all of them. I tested both large and small diamonds and as you can see in the video you need a steady hand for smaller diamonds because if it touches the metal you’ll get an inaccurate reading. You also need to frequently re-adjust the calibration because it can get too hot and mess up the reading. As long as you are able to eyeball the carat weight of a diamond, you will do just fine with this tester, in my opinion. If you don’t know what a carat, .5 carat “looks” like you should familiarize yourself because that’s the basis of the calibration. Instructions were clear and easy. I highly recommend.

This is very sensitive to temp which makes it kind of hard to calibrate. However, once it is calibrated, it seems to work well on everything but earrings (probably due to stud blocking electricity flow). I tested on known diamonds (rings/bracelets) and known fakes and it was accurate only after calibration (meaning use a known diamond to get it to temp and accurately reporting it as a diamond). I would not use this without calibrating each time you use it as it is very easy to get a false reading and that could be a costly mistake. (I did not test using loose stones and I would not trust this for that at all as it seems very sensitive).

This is a cheap tester and you get what you pay for here, it is not accurate. I work in a jewelry store and have access to a more expensive and as it turns out, much more accurate tester.This tester alerted 'diamond' on CZ, white topaz, and white sapphire (loose stones, so not touching any metal), but failed to alert on several real diamonds (that alerted on other testers and are independently certified).Not enough pressure and it won't alert on genuine diamonds, but too much pressure and it alerts on everything else and the difference between not enough and too much is a pretty small margin.The other positive reviews leave me to wonder if I just got a dud, which I hope is the case, but I would waste the time and money trying again on it.

Nice product

Es un exelente producto para una revisión básica sirve, pero hay que tener otras herramientas para detalles mas precisos.