Tibetan silver is used primarily in jewelry components, and is similar to pewter-an alloy of copper, and sometimes tin or nickel, with a small percentage of pure silver.Its overall appearance is of aged silver, but it can be polished to provide highlights on complex castings.urrently, jewelry, beads and castings described as 'Tibetan Silver' tend to be a base iron 'cheese metal' casting, overlaid with this pewter and silver plating. Dependent on source, these can be either thick and robust, or attractive but easily broken due to a loose, fragile inner casting.