Natural crystal quartz tumbled bead & brass tone metal clasp necklace

This is a beautiful natural crystal quartz tumbled bead & brass tone metal clasp necklace. The beads are colorless but look light blue because of the blue thread that has been used in stringing them. They all have tiny natural inclusions under 10x magnification, true of genuine/ natural quartz. The clasp has an easy “screw on and off” mechanism. The necklace measures 23 inches long. In excellent vintage condition.