Vintage Sterling Agate Earrings Marked RR

Sweet vintage earrings are gold plate over sterling silver with a pretty striated brown and white stone. I think theyre agates and each one is a bit different. Small 3/8" x 1/4" stones have faceted top edges and post backs with push-on backings. Earrings are marked 925 RR and backings are marked 925. Nice vintage condition with no issues.