Large Black Stone Art Deco Style Ring

No flaws whatsoever, just too big for any of my fingers now! I think it's from Old Navy or Marshall's, not exactly sure where I bought it. I believe its a size 7. Not sure what metal it's made out of, but it's definitely nickel-free since I'm highly allergic to nickel. I hesitated to post this one because it's just so extra and I love it, but it deserves to be worn a lot more often! Please leave me a comment with any questions :)