These are just fun! My friend collects and polishes stones then gives them to me! This batch did not have drilled holes to use in jewelry! These great macrame necklaces solve that issue! They hold the stone in a pocket with a sliding bead that closes the pocket. I'm not a gemologist so I cannot verify the type of stone. One (in the main picture) appears to be an amethyst. There is one that appears to be a quartz. They are all large (over 25mm) and nicely polished!