I really couldnt tell you what they are made out of. Dont look plastic. Im sorry I cant fully answer your question. The beads are about a centimeter and half big.... on the necklace it also has a bead of an gold engraved stars and moon(<- that bead is at where any other jewel or pendant or whatever would be) in the center of the necklace. and that bead is 1 cm long. :)