Top rated impression: T. gibbosula and C. rustica shells found in layer 4c on the cave in Morocco, which had been beads from what exactly is now referred to as the oldest jewelry in the world. Resource: A. Bouzouggar, INSAP, Morocco / Given that the beads are sometimes fragile also, https://titusfdzwt.bloggactivo.com/30539436/the-ultimate-guide-to-ancient-beadwork