The choice of N. gibbosulus in Mediterranean web-sites and N. kraussianus is South African internet sites is actually a purpose of their availability within the vicinity from the sites, but doesn't make clear why this genus was desired over other shells of comparable sizing and form. A comparison on the https://medium.com/@spoilmevintagediy/the-rich-history-of-beadwork-a-journey-through-the-ages-4e4fd2e474cf