Prime image: T. gibbosula and C. rustica shells located in layer 4c from the cave in Morocco, which ended up beads from what is now generally known as the oldest jewelry on the earth. Resource: A. Bouzouggar, INSAP, Morocco / The rigorous hardness and brittleness on the materials designed it https://medium.com/@spoilmevintagediy/the-rich-history-of-beadwork-a-journey-through-the-ages-4e4fd2e474cf