Large vintage Navy Blue button style earrings

These unusual vintage earrings are from my mother in law’s collection. They are Navy Blue button style with a con-caved middle section which looks like a carved area. I’m not sure what these are made of as they have a good weight to them. See pictures for details and approximate measurements Age related wear, but these are in amazing condition Ask any questions🙋‍♀️ Bundle for extra savings🛍🚐 Happy Poshing❤️🐾🐾🚐 G62