Likely on the older side of things for Native American jewelry. The green turquoise has aged and has some missing segments, breaks, etc.   It is signed LS on the backside. My best guess is that this is Navajo, by Lula Mae Stago.   The length of the face of the ring is 1 1/2 inches.   This ring is a size 7.   It weighs 11.3 grams. Vintage Green Nickel-free Rings, Bohemian Untreated Green Turquoise Ring, Adjustable Green Turquoise Southwestern Ring, Green Turquoise Ring With Patina In Sterling Silver, Collectible Green Turquoise Bohemian Ring, Bohemian Green Untreated Turquoise Ring, Untreated Green Turquoise Bohemian Ring, Collectible Bohemian Green Turquoise Ring, Collectible Green Turquoise Ring