Beautiful rich blue red crystals embedded in resin(?). The hole is Rhodium plated which doesn't tarnish, a big plus in my book! They have wonderful sparkle. These are great for using with the Pandora type bracelets, item # 12240 3mm cuff bracelet or 3-4mm braided leather. Auntie's 6 & 8mm sterling large hole spacer beads work great as stop beads for braided leather.