Answer: Tibetan Silver is a silver-colored alloy consisting of copper with tin or nickel. Some items described as Tibetan Silver are cast iron that has been plated with the silver-colored metal.Most Tibetan Silver is copper with tin rather than copper with nickel, because nickel causes skin reactions in many people.nswer: Tibetan Silver is a silver-colored alloy consisting of copper with tin or nickel. Some items described as Tibetan Silver are cast iron that has been plated with the silver-colored metal. Most Tibetan Silver is copper with tin rather than copper with nickel, because nickel causes skin reactions in many people.