Hey everyone. For those of you who have the Chanel crystal stud earrings(or any other Chanel costume earrings), how long can I expect to have them before they start to tarnish? I know they're not real silver or gold plated so I've heard that they'll tarnish with wear. I definitely won't be wearing them in the shower or getting them wet- I'm just concerned with natural oils from skin and such. A tpfer said she's had hers for 7 years with no tarnishing! But then others have said they've had theirs for a year before they couldn't wear them anymore. If I take care of them- will they really last years and years without tarnishing even though they're costume jewelry? Thanks!