Prime picture: T. gibbosula and C. rustica shells found in layer 4c of your cave in Morocco, which ended up beads from precisely what is now generally known as the oldest jewelry on earth. Source: A. Bouzouggar, INSAP, Morocco / The powerful hardness and brittleness from the materials manufactured it https://bbsocialclub.com/story20290438/getting-my-victorian-beadwork-to-work