We all do it. Buy cheap (but lovely!) jewelery from shops like Diva, ASOS, Collette Accessories, etc.
Did you know that if you coat the jewelery with clear nail polish, it won't rust? (And, in turn, make a green ring around your finger/in your earlobe! Eew.)
It's such a disappointment when you have a beautiful turquoise ring/silver bling and it goes green. EEW.