Sterling silver, also called 925 silver, oxidizes when in contact with ambient air. Sterling silver is 92.5% silver and 7.5% copper, and copper oxidizes by reacting to humidity in the air. That's why you get tarnished jewelry if you store them in your bathroom or a humid environment. We have put together easy tips to help you care for your silver jewelry. We also have a simple method to help you clean your sterling silver jewelry at home.