Hard to believe that a small piece of cloth can clean jewelry and yet it works! Really tarnished jewelry regained their beautiful shine, almost like new. Beware however, after intensive cleaning phase, there has almost as many black fingers on the cloth, think also used to protect the surface (work surface, table), because black tends to try. The cloth also worked on pewter jewelry. For very dirty jewelry, there will certainly use a more radical approach than cloth, but for occasional use on jewelry tarnished in the open, it's perfect.