Different sellers. These are listed on Etsy. The typical I assume are the porcelain feel with some of them showing visible flame or at least under close inspection. There are ways to mimic similar look and thus not natural. I am very curious if the Volute (Bater) snail can produce these low grade, or less common pearls. Some sellers list as individual pearls, others as part of a ring or pendant. Not much info is provided as to the source. One of these sellers is the one I purchased from and consequently returned merchandise. He insists to this day that it is genuine Melo Melo. I guess I just at the least confirm if he may be honest.