This is a natural stone ring made of SILVER. I received this as a gift, so there are no hallmarks, but it is made of silver and the natural stone is amethyst. The size didn't fit me, but I loved the thick top, so I used it twice with a silicone ring adjuster band. I think it will fit someone who usually wears a size 13 ring, so I will ship it with the silicone band attached. (It can be removed) The material is definitely silver. I cleaned and cared for it before listing it, so you can use it right away. Material: Silver, Amethyst Hallmark: None Size: 16.5 (fits like a size 13) *There is no box or warranty card. Amethyst Amethyst Silver SILVER Ring Simple Ring ITALY Italy agete ete Ron Herman Bijumam Recommended for those who like these brands too!