Love to be able to say i know what it is but I don't - the material that is. It came to me in an estate lot of sterling rings BUT this one is not marked. Although it does not stick to a magnet I feel like it's stainless so I'm going with that. The symbol is the sign for Man and Woman. It's a size 10 and the only one I have. Since it's a mystery metal let's let it go.