I believe this ring could qualify as a”antique” Navajo ring.  It is pretty small, a size 5 and the stone shows use.  It has been worn and dinged a little, which I think add a heap of character.  There are three silver circles at the top and bottom of the ring, and the stone is set in a smooth bezel surrounded by small silver dots.  It starts as a double shank and comes together to form a single shank.  I love the character in this ring and the color of the stone.  c. 1920s.