Sterling Silver + Non-Sterling Rings

Non-Sterling Off-white semi circle ring: 5 Tiny cubic zirconia gem ring: 5 (Possibly) Sterling *truthfully, none of the following rings are stamped, but I have reason to believe that they are sterling silver. The use of opal + turquoise and the decorative scalloped edges around the stones is very common in handmade Native/Indigenous jewelry which uses sterling silver. Not sure the specific origin of the rings. Turquoise turtle: 4.75-5 Turquoise dot: 5-5.25 White opal: 5-5.25 Bear + mountains: 5 Questions? Leave a comment!