4.Silverplate--base metal--coated with silver by electroplating. NOTE--Often by doing an examination with your loupe you can determine that the piece in question is plated. The base metal will show through where repairs have been made or there has been a lot of wear. Areas that have lost the plating may be a different color or are duller than those still plated.
5. Sterling silver--92.5% silver--925 parts silver and 75 parts copper--can be marked "925" or "sterling" .