Tarnished after 2 days

I bought these nose studs and didn't get a chance to wear them until after the return window closed as I had a hoop that was difficult to remove. Once I put it in it looked lovely but after i removed it two days later with nothing more than general bathing/face washing (no swimming) the entire nose ring from the stud down was tarnished to a dark brown. Disappointed as I thought they were made of stainless steel.

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