Vintage bronze sovereign signet ring

A unique, mysterious, maybe magical ring ! The genuine bronze metal makes it look even more original. For men and women. Unknown origin. Unknown green gem stone, that is uniform (apparent patterns are only the reflection of the camera and room.) In very good condition, no scratches at all, but somewhat uneven, and a little spot on one side near the tip of the wing (see last pic.) Size: approx. 8.5 / 8.75