Leading impression: T. gibbosula and C. rustica shells located in layer 4c of the cave in Morocco, which have been beads from exactly what is now known as the oldest jewelry on the globe. Source: A. Bouzouggar, INSAP, Morocco / The powerful hardness and brittleness with the materials designed it https://medium.com/@spoilmevintagediy/the-rich-history-of-beadwork-a-journey-through-the-ages-4e4fd2e474cf