I have had this interesting ring for many years and have never found anyone to tell me if the domed top stone is either glass or an agate of some kind. There are no fractures or stress cracks that would indicate glass and the stone is frosted, not clear. The back is done in sterling or I would be able to identify it better. It is the most lovely shade combination of milky white and jadeite green. The ring is a size 5 and I would advise having a jeweler size it without traditional heat.It is hallmarked Made in Mexico, Sterling. The face is 1" North to South.
Please email with any questions.