What makes metal jewlery smell and how to u get rid of it?

Hello Friends,

Have you noticed how some old silver or metal jewlery gets a strong old metalic smell to it? What can I do to get that smell out of some of my necklaces etc, with damaging them? An is there anyting I can do to prevent it happening again. It seems to be pieces that I have not worn for a while. What makes metal jewlery smell and how to u get rid of it?

Thanks In Advance,
Deepak Bhalla