Vintage 925 sterling silver Southwestern Navajo ring w natural blue turquoise

Vintage handmade sterling silver ring. With natural blue turquoise stone of good quality. Southwestern, possibly by Navajo. Size 5.25. In good condition, as pictured. Stamped 925 and has few other marks, only partially visible. Covered with decades old patina. I didn't clean it on purpose, as such patina is very desirable to most collectors and further accentuates the item's age and character.