925 Silver Moonstone & Marcasite Set 18” Necklace & Hinge Back Post Earrings

Dainty openwork silver and stone set, perfect for daily wear. 18” Cable chain & lobster claw clasp. In very good condition, minor age-related wear on the clasp, only visible under magnification. I’m not sure about the stones but they look like moonstone or garnierite and marcasite. The earrings aren’t stamped but the chain and pendant are. No makers mark; I believe “IS” is country of manufacture.