Vintage Turquoise Ring Navajo 4 Split Prong Size 6.5

Amazing, well loved Dine (Navajo) turquoise ring featuring a 22mm by 17 large, natural turquoise. The ring was loved, and worn, for many decades showing wear. The serrated setting is nearly flushed flat on the turquoise as if they are one piece.  

Medallion measures 1" by 7/8" wide. 

Not marked but tests as coin silver, or higher. 

About a size 6.5.