Hello, this product means silver plated on silver alloy necklace metal. Despite being of superior quality compared to products in its segment (every jewelry/jewelry product), the chain, pendant, and pearl are contaminated with salt, iron, acid from the sweat secreted on people, etc. It has the possibility of oxidation, depending on the amount of elements. As long as care is taken and use is careful, your products will be safe. You can evaluate our other alternative silver models in our store for our tarnish-free guaranteed products. Best regards, oyster pearl team.