Copper jewelery (neither silver nor gold) should be exposed to detergents and water. And this is the first and essential thing - removing ornaments from your hands, e.g. before washing dishes. Chlorine is also harmful, so swimming in the pool is also not allowed. The perfume should be used before putting on the jewelry, after the skin is dry. Even the presence of skin cosmetics - e.g. greasy body lotions - can be harmful. It should be stored in a closed bag, e.g. a zipper, to minimize the risk of air ingress. Every now and then it needs cleaning to regain its glow.