It is assumed that metal is waterproof. While water does not affect a metal immediately, it can damage it over time under favorable conditions. Metal gets oxidized in the presence of air and water. Iron can rust and decay if left in the open or water. Even precious metals are tarnished and lose their sheen in these conditions. These problems occur because of oxygen and moisture present in the air. This is why there is now a strong demand for waterproof necklace. These necklaces are made with a waterproof material like stainless steel.
Stainless jewelry does not get tarnished even when left in a moisture prone area. It does not leave any coloration on skin. This is the perfect material for sensitive skin. You can wear this necklace while bathing and swimming without worrying about any tarnish. This type of steel jewelry is also available with gold plating.