This is a really good jewelry cleaner. It goes in my automatic jewelry cleaning machine, and is concentrated, so it lasts a long time, making it worth the price I paid. Three minutes in the machine and my jewelry sparkles. I use it for all types of jewelry, from gold to silver, to costume jewelry. So far (and I have been using it for years), it hasn't hurt any type of jewelry that I clean that I put in the it. It's a really good buy.