[Upgraded] Diamond Tester Pen, High Accuracy Jewelry Diamond Teste Portable Electronic Diamond Tester Tool for Jewelry Jade Ruby Stone（with Battery）

This is accurate and, easy to use.

I was happy with diamond checker. Price is right. I found best method was check your original diamond and follow same process for others thx

Easy to use

I ordered this product not sure of its quality. But once receiving it and using it. It works wonderful easy to use and a good value for the price. Does not seem to be cheaply made

Had this product for a bit. Check some jewelry that I had recently gotten. Yet they were all reading that they were real. Took them to get retested and they are not real. This product doesn't tell the truth.

I love the fact how cheap it is and it does work but you do also get what you pay for it is a cheap diamond tester and does not pick up very well for small diamonds which pretty much if you're buying this you're trying to use it for a smaller diamond just know that one little caveat.

I've been wanting to purchase one of these for a while to use when going to auctions or garage sales. When I received it, I immediately began using it to test our own diamond jewelry. It worked perfectly giving us both positive and negative readings depending on the item tested.

Produce is accurate and has stopped me from being taken advantage of. I buy jewelry online. Right when I get the product I check to make sure they are real diamonds.