Prime graphic: T. gibbosula and C. rustica shells found in layer 4c in the cave in Morocco, which were being beads from what's now generally known as the oldest jewelry on the earth. Source: A. Bouzouggar, INSAP, Morocco / The intensive hardness and brittleness on the materials manufactured it difficult https://medium.com/@spoilmevintagediy/the-rich-history-of-beadwork-a-journey-through-the-ages-4e4fd2e474cf