They're lampworked glass beads in iridescent metallic shades in two tones (the bead will appear to be that of two colours when checked out from various Instructions). Lampwork Lampwork beads are made by melting slender rods of glass by hand in excess of an open up flame (commonly a torch). https://codyhfczv.bloggerchest.com/30859050/what-does-yellow-beads-mean