Major picture: T. gibbosula and C. rustica shells present in layer 4c of your cave in Morocco, which had been beads from what's now often known as the oldest jewelry on the earth. Source: A. Bouzouggar, INSAP, Morocco / Ancient Egyptians designed several objects from faience. Most popular of them https://medium.com/@spoilmevintagediy/the-rich-history-of-beadwork-a-journey-through-the-ages-4e4fd2e474cf