Vintage Modernistic Men's Cocktail Ring, Brutalist Style.

This is a very unique ring, I have never seen one like this before. Not sure about anything about this ring, only a maker's mark which is 17, looks like it is silver plated over brass because it shows through the front, open backed faceted stone and pronged, 1980's era, very detailed, size 11 1/2 so you can wear it on many fingers. I have posted that it is a man's ring but hey anybody could wear this! Brutalist Modern Statement ring and very unusual piece of jewelry, love it, great gift also!

~ needs a good cleaning, I don't do that.