This old Navajo ring has the most extraordinary turquoise stone. It really looks like a turquoise jasper stone, but I'm not sure exactly what it is only that it is truly different and in very good condition. It measures a little over a size 6-1/2, closer to a 6-3/4. It is marked, "Sterling", but has no maker's mark. I'm placing it at about circa 1950-60.