Surgical Steel 20G post earrings with solid brass triangle with rhodium plating 7mmx7mm with butterfly backings. Sold by pair. Rhodium and 14Kt gold plated over brass when colored.
Because brass contains copper, it can oxidize with moisture or skin chemistry and leave a harmless greenish tint on the skin. It isn’t an allergic reaction, but it does make these pieces better suited for occasional or event wear rather than daily use.