Tarnish occurs naturally on silver. It doesn't damage the metal but it doesn't look that great. The best way to stop tarnish is by polishing silver regularly, but most times it is unavoidable. The good news is that it is easy to get rid of and control, without having to buy any jewellery cleaner or other concoctions of chemicals.
All you will need are the following things: Baking soda, boiling water, aluminum foil, and a shallow bowl.
How to clean:
Step 1: Line your shallow bowl with aluminum foil (shiny side facing up).
Step 2: Add a teaspoon or two of baking soda.
Step 3: Add boiling water to bowl. Baking soda will fizz.
Step 4: Once fizzing has stopped, add the ring. Holding the face so the band is submerged in the water. The design on the ring should be facing you, and out of the water. This is because if you leave it in there too long, the oxidized part of the design may lose definition after repeated cleans.
Step 5: Take out and quickly wash with warm water and polish with a soft cloth to remove the tarnish.
This will get off most, if not all of the tarnish of the ring, and it will be shiny again...