Sterling Navajo ring signed by acclaimed silversmith

Stunning silver ring in Sunburst pattern crafted by well-known Navajo silversmith Howard Nelson who is featured in high-end Native American galleries. Signed by the artist and marked "Sterling." Excellent condition. The ring face is about 1.5 inches long and 3/4 inch wide. A ring guard was attached to this ring (see the pic) which can be removed for a bigger size. With the ring guard, I'd say it's a size 5.5 (it fits my finger, a size 6, but it's a bit tight). Without the removable ring guard, I'd estimate size 7.5.