What fun these are! Stunning geodes lined with quartz crystals have been cut into slices, a job that undoubted requires time, patience, and extreme skill. The slices range from 3 to 5mm thick, and the "frame" is naturally-patterned agate, polished on both sides, so they can flip over and still look pretty. Tiny, perfectly-formed quartz crystals sparkle along the interior rim. Loop a soft cord through them, drill a hole through the agate, make an interesting bail, prong-set them flush on top of an open or closed backing (with perhaps a different stone set in the center!), wire-wrap them (on the outside, away from the crystals)--the design possibilities are endless. They are agate, so they are fairly sturdy, but they won't survive being dropped on tile or cracked against a hard surface...Treat them as though you were working with a cross between a glass cab and a druzy, and they should be just fine.