Material - Silver Plated Stone - Synthetic I have adjusted rings & solid sizes as well The second Material is - Copper There is a mixture of Stainless & Silver plated, Unsure Which Is Which Birthstones style July - Ruby January - Garnet February - Amethyst November - Yellow Topaz April - Diamond May - Emerald September - Sapphire Side note - Some of the rings have metal bubbles b/c the tiny gas bubbles escaping the mold during the casting process.