Vintage set of six spoons - demitasse size. They were tarnished and polished up like silver with a polishing cloth. They are marked FM PO.9M. The M is shaped like a 3 on it's side so it may not be an M. See photos. That mark is on the bowl.  On the back it's marked FM Artesania Argentina. The stone is Rhodochrosite Inca Rose.  The spoons measure approximately 4" long. They been stored in their box for years, never used.  Smoke free home.