Sterling silver is an alloy of silver containing 92.5% by weight of silver and 7.5%
by weight of other metals, usually copper. The sterling silver standard has a
minimum millesimal fineness of 925. ..... International Hallmarks on Silver
Collected by Tardy, 5th English Language reprint (2000); original publication
date unknown, ...
925 Sterling Silver - Real or Fake?
925 sterling silver can be faked. Here are some tricks to use when you're
shopping to discover if it is real silver or fake/plated silver.