All of the sterling silver chains are 100% solid .925 sterling silver. They are not filled or plated. They will patina over time and can be cleaned in commercial silver cleaning solutions to make them bright again. Or you can give them a quick rub with a jewelry polishing cloth. If you would like an antiqued finish but don't want to wait for years for the chain to accumulate a patina, let me know. Any of the sterling silver chains can be artificially oxidized upon request.