Vintage Turquoise Blue Color Ring Size 6 Its not a stone - not sure what the material is. Stamped Sterling Mexico on the inside Love the design, its got a great Vintage look to it. I could not pass it up when I saw it in an antique shop in New Mexico, but look over the photos - its got a space in the weld on the back of the ring. I have not polished it, I left the patina on it as I found it. Good Vintage Condition