This beautiful vintage silver and turquoise ring is nearly identical to one previously listed by anotherer and according to that listing is a Royston turquoise and attributed to the Navajo. The color is a beautiful blue with golds and browns running through it. The ring has a rope-like outer edge and the stone is bordered by a sawtooth design. It's in excellent condition and is about a size 7. The ring is unsigned and unmarked, but according the aforementioned listing, this is usual for that time period and is sterling or at least coin silver. This comes from the Crosby estate in Lenox, Massachusetts.