This is THE BEST jewelry cleaner for my wedding ring (gold with 1 caret diamond). I leave it in Simple SHINE for only 2 minutes (1X per week because I'm a clean freak--not that it needs it very often). And it's very gentle on my hands, too--although I live to wash my hands after touching this substance because I'm just that way. Like a racoon! Washing a lot....I'll buy it again in the future, when it's finally used up--but I'll take a long time to run out of this great stuff.