Why is my sterling silver earring turning?

Sterling silver is an excellent alloy of silver with 92.5 percent pure silver and merely 7.5 percent other metals like copper. This silver hardly turns. However, lower-grade versions of the silver may tarnish after some time. These may react with dirt and similar oils, leading to a chemical process or oxidation.
Although, there are various ways to ensure that your silver jewelry doesn\'t tarnish and hence use vinegar to attain the best results.