Answer by
alc1974 (71)
Sterling silver is 92.5% pure silver, and will be stamped "sterling" or "925" somewhere on the item. Silver plated items have a thin plating of sterling silver over some other kind of base metal, like copper, brass, or nickel. Silver plated items are often marked EP for electroplated, or EPNS for electroplated nickel silver, or are not marked at all.