Vintage Mexico Sterling Silver and Green Onyx Teardrop Mask Ring size 7

This fabulous ring is made in Mexico and most likely dates to the 1970s. Matches a bracelet and second ring for sale in my closet! It is stamped on the back, "Sterling 925" and also a makers mark. Made of green onyx carved into a teardrop shaped mask, set in fancy filigree sterling silver frame. Wears as a size 7. It is just so cool! The top measures about 3/4" by 1". In very good condition, but with the back partly bent. From a high end estate.