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Sterling silver, a precious metal, is an alloy of silver containing 92.5% by mass of silver and 7.5% by mass of other metals, usually copper. When sterling silver tarnishes, it is mainly the copper portion that is responsible.
For this reason, Sovats sterling silver use a modern sterling silver alloy which modifies the traditional alloy (92.5% silver + 7.5% copper) by replacing some of the copper with the metalloid germanium to protect Sovats sterling silver jewelry from tarnish.
See more from Sovats: http://www.sovats.comSovats Sterling Silver