I wanted to get a little extra sparkle out of my diamond ring that I couldn't get from my polishing pen so I ordered this, hoping it would work as expected. The low price made me choose it, and I am not disappointed at all! My first time using this cleaner: In a couple of minutes my ring was polished. WOW, so sparkly!! The diamonds were crystal clear and every spec of dirt was removed from the white gold setting. I loved the results! A tip: make sure to read directions, as jewelry with softer gems is not recommended, as well as jewelry that has any loose settings because the vibrations will make the gems fall out--this happened to a pair of black onynx earrings that I had cycled through this cleaner. This cleaner works great on gold jewlery and diamonds!