Vintage Silver Mexican Navajo Iridescent Abalone Moonstone Filigree Oval Ring

Gorgeous ring that changes color when the light hits it / you move. I inherited this from my aunts estate. Haven’t tested it so unsure if Sterling or silver plated or what. In good gently used vintage condition. Some tarnish as pictured, but that can likely just be polished. Stunning as is though. My ring sizer has it at a size 7