» For other uses, see Hallmark (disambiguation).A hallmark is a mark or series of marks struck on items made of precious metals — platinum, gold, silver and in some nations, palladium. General overview Hallmarks defined A hallmark, is a mark or series of marks struck on items made of precious metals — platinum, gold, silver and in some nations, palladium. In a more general sense, the term can also be used refer to any distinguishing characteristic or trait. Historically, hallmarks… (More on Hallmark)