does .925 sterling silver tarnish
Does 925 Sterling Silver Tarnish. 1  a silver alloy with no more than 7.5% copper. 2  Sterling silver is an alloy of silver containing 92.5% by weight of silver and 7.5% by weight of other metals, usually copper.3  The sterling silver standard has a minimum millesimal fineness of 925. 4  Silver of a fineness of 92.5%. Sterling silver is an alloy of silver containing 92.5% by weight of silver and 7.5% by weight of other metals, usually copper. 2  The sterling silver standard has a minimum millesimal fineness of 925. 3  Silver of a fineness of 92.5%. 4  Silver of 921/2 percent purity.