In the months that I've worn these earrings they haven't tarnished and I don't think they ever will.  Just to keep in mind I wear my earrings 24 hours a day through showers, rain, sweat, sleep. the backings are nice and tight so they won't just fall off. Even the largest sizes don't slip out of my ears and I sleep pretty wild. The gem quality is beautiful. looking at them you'd never know these earrings were this affordable. by far there my favorite pieces of jewelry right now. And when I inevitably lose them all lol I will be buying more!