Best image: T. gibbosula and C. rustica shells located in layer 4c with the cave in Morocco, which ended up beads from what on earth is now often called the oldest jewelry in the world. Resource: A. Bouzouggar, INSAP, Morocco / Karen Loise van Niekerk will not function for, consult, https://medium.com/@spoilmevintagediy/the-rich-history-of-beadwork-a-journey-through-the-ages-4e4fd2e474cf