With constant wear, all pieces of jewellery get dirty.

A quick buffing with a polishing cloth will bring back the metal's shine.
However, there's no mystery to caring for your quality silver jewellery. Just follow these tips:

Store your silver in a cool, dry place that is preferably airtight, to avoid oxidation.
Avoid direct overexposure to artificial light or sunlight for long periods.
Don't store directly on wood, which often contains acids that can affect silver's surface.
Silver improves with age and develops a lush patina. Treat your silver well and it will reward you with a life long lustrious look.