These are Natural , earth mined BLUE SAPPHIRE plain rondelle beads finished with SOLID 925 Sterling Silver lobster clasp (Rose Gold). All chains and spacers are also Solid 925 Sterling Silver. Clasp is adjustable from 6.5" to 7.5". Size of stone - 4 - 4.5 mm, Width of stone - 2 - 3 mm. Weight of bracelet - 39 carats . The picture are generally enlarged to show the clarity and cuts more accurately, please look at the Sizes above to determine what you would receive.