The hoops are made from sterling silver wire.  These earrings are designed to be interchangeable with other gemstone or lampwork charms.  The ball on the end of the hoop prevents the charms from falling off while worn.  Just remove the earnut to slide the charm off to wear the silver hoop alone or replace with another charm.  If you have another gemstone or glass colors you would like, just contact me to inquire and we can see what we can do!