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Quick answer: sterling silver is defined by its silver fineness, not by a universal promise that every remaining alloying element, solder joint, clasp spring or surface layer contains no nickel. A 925..

Answer first: A necklace rash does not prove that a piece contains nickel, and a metal’s color does not reveal its complete alloy. Nickel is a common cause of allergic contact dermatitis, but frictio..