According to the policy for Fashion, 2.0 states: Fashion jewelry is not made of precious metals (except precious metal plating over base metal). 2.1 states: Fashion jewelry metals include base metals...also includes jewelry made with an underlying base metal...and plated with a precious metal.
Yes, you can sell gold or silver plated base metal and any stones on the non fine list.
Here is a document that will spell things out for you a bit more clearly and help you avoid suspensions. Amazon is extremely strict with jewelry - more so fine than fashion, but if they catch you in a mistake, no matter how innocent, it can result in suspension.
Several of us collaborated to come up with this tip thread. I think it'll set your mind at ease as to what you can and cannot sell .
Biggest thing, if you sell anything with an identifed stone - i.e. turquoise, you have to disclose any treatments that stone had. This doc spells some of those out for you.
SURVIVING IN THE JEWELRY CATEGORY
Good luck! You'll want to hang around the forums - there are several jewelry sellers that are active posters, and we all try to give each other a heads up on info like this.