I would only use domestic sequins of course. To reduce the abundance of the wild strains would be so very wrong on so many levels. There are extensive sequin ranches in China, and they provide the glittering darlings. I am told that any piercing is done under anesthesia, which is more than I can say for piercings done in ink shops. I have found that they frequently escape and have wondered if hybrid sequins can be found in the taiga of Alaska.
J