Material - Silver Plated Stone - Synthetic I have adjusted rings & solid sizes as well The second Material is - Copper Birthstones style July - Ruby January - Garnet February - Amethyst November - Yellow Topaz April - Diamond May - Emerald September - Sapphire More names of Gemstones Critrine Pink Spinel Alexandrite Morganite Peridot Tourmaline No birthday stone - Black oxy Black spinel Black Diamond Side note - Some of the rings have metal bubbles b/c the tiny gas bubbles escaping the mold during the casting process.l