Prime graphic: T. gibbosula and C. rustica shells present in layer 4c from the cave in Morocco, which were being beads from what on earth is now called the oldest jewelry on the planet. Resource: A. Bouzouggar, INSAP, Morocco / The rigorous hardness and brittleness on the materials produced it https://renaissancebeadtrade54296.tblogz.com/the-smart-trick-of-murano-glass-beads-that-no-one-is-discussing-45070604