re: Wife allergic to all earrings, unless they are gold

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I have seen people on the watch forums talk about allergies to certain metals / materials in alloys

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Primarily that is nickel and to a lesser degree cobalt. The watches that usually get people are Rolexes. The newer ones (post 1985) use 904L which is much higher in nickel than the typical 316L which has about half the nickel compared to 904L.

Useless watch trivia: Omega was the first company to use 904L steel in their 1972 Ploprof but abandoned it when they stopped making the 1st gen Ploprof.