The choice of N. gibbosulus in Mediterranean web pages and N. kraussianus is South African sites is really a perform of their availability inside the vicinity on the internet sites, but isn't going to make clear why this genus was chosen over other shells of comparable dimensions and condition. A https://medium.com/@spoilmevintagediy/the-rich-history-of-beadwork-a-journey-through-the-ages-4e4fd2e474cf