When silver and other metals get oils on them from fingerprints, creams/perfumes, etc, it will gather the dirt and dust particles that cause tarnishing. An individual’s unique chemistry and hormones can sometimes cause tarnishing, as well as particular chemicals in water, or even certain foods. As a general rule, if you wear it regularly, it will stay silver. And when not in being worn, store your jewelry in a small bag or box, out of the sun, and do not keep your precious treasures in the bathroom.