First things first.... Is it marked sterling or .925 or both ?? (Sterling marks came before the number system.) 2nd is look at the design, is Victorian or is it a Hippie design, Mexican or Indian maybe Arabic.... 3rd where did you find it ? Old site or new site ?? It looks old but I'm going to guess just a typical .925 hippie ring.... I don't think you have anything super rare or anything like that... I've been wrong before but that's my two cents....
It's marked Siam 925 sterling. Siam makes it Thailand. It was found at a that I've been taking things from 1600 to 1880. Nothing newer. It's too well made for a hippie ring.. If by hippie rings you mean ones that were copies of this type. This seems to be really old.... Very tainted if that's anything to go by?