A mechanical bonding with a silver alloy of at least 92.5 percent fineness. The bonding must be equal to at least one-twentieth of the metal in the article. This can also be called silver overlay, but never silver plate.

Items are made of 92.5% pure silver and 7.5% copper or other alloy, proportions fixed by law. Sterling silver will "patina" in time, that is, its color will take on an "antique" look.