Looks like a nice Pyrite crystal ring,have you tested the ring shank for gold?
It looks like slag in the photo...... https://sites.wustl.edu/meteoritesite/items/glassy-vesicular/
We found a lot of the stones in Virginia years ago, my sons gave most of them to their friends........
Most items today are laser engraved since it is fast and less expensive than hand engraving. I found one box on ebay.......
Hard to tell with the photo,take it outside with the sun overhead and see what happens.
There are many variations in styles,Hugo Kohl in Virginia has a wide number of pieces made with original antique dies.Knowing the style you are...
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