Gold Tone Spring Ring

This ring is unique and all a single piece, wound around to create a spring! It has light tarnishing and loss of colour through use, pictured (I've worn swimming and washing my hands while testing) but it appears to be minimal so far. Suggested to take off while washing hands. During testing I've had zero skin discolouration so the quality otherwise appears to be good! Given that I purchase all of my products from thriftshops, I don't know the nature of the materials.