Oxidized sterling silver jewelry is made of sterling silver that has been exposed to oxygen in a pressurized environment for a long period of time. It is different from traditional silver because it is a darker color and has very little luster. The effect of oxidizing pieces is for a slightly tarnished or antique jewelry look. This happens when the sterling silver jewelry is purposely exposed to air that contains sulfur. This compound, kumush sulfid, creates blacked patches, which gives the silver a dark black finish, resulting in pieces that have more of a vintage look.