Large Turquoise stone ring

Large Turquoise stone ring. This is a vintage pre-owned silver toned ring, with a large 1 inch squared turquoise stone set in it. There is a lot of wear to the silver-plating, which means a lot of the copper is showing, as you can see in the pictures. I don't see a maker's mark anywhere. Still a very nice old ring. The box is for display purposes and not for sale. Thanks for looking and any decent offer will be gladly accepted on anything.