"Sterling silver" refers to the purity of a particular silver object - specifically, sterling silver is 92.5% silver.

Oxidized silver is not necessarily sterling silver but sterling silver can be oxidized. Oxidation is a finish on silver, otherwise known as tarnish. Sterling silver can tarnish and silver plate can tarnish, too.

Oxidized silver is not necessarily sterling silver but sterling silver can be oxidized. Oxidation is a finish on silver, otherwise known as tarnish. Sterling silver can tarnish and silver plate can tarnish, too.

Hi,

silver plating over sterling silver is not real sterling silver.
Sterling silver is a unique blend of silver and usually copper. It contains 92.5% silver, that is why the number on sterling silver jewelleries and other stuff is 925.