It is a non-natural puka shell. It is a puka shell made by acting on behalf of the manufacturing process performed by nature. Natural puka shells are untouched by humans because the shells of snails are caught in the waves and scraped by sand to leave hard parts. As it was picked up on the beach, this puka shell was made by machine on behalf of the natural manufacturing process. It seems that it is quite difficult to find a natural puka shell now.This product is for handmade jewelry ,handmade accessory and ethnic goods.