Hi I have a ring of my grandmother's with three green stones and I was wondering if it was real peridot or not. No one I asked in the family knows so that has led me nowhere. It has an ajustable band (which is good for my big fingers) in which I do not know the metal that it is made from. i also haven't found any type of maker's mark. Either way, I find it a gorgeous piece and I'll still love it even if it's just costume jewlery but it would be nice to know. Please reply!