Dizzie, that was my thought also, and in one of the photos it looked to me like one of the pearls was added to the chain with a little too much silver sticking out of one of the drill holes, usually they would have been tighter there. On this note, many of the costume jewelry makers in the USA , even some low end ones, used cultured and freshwater pearls in some of their jewelry.
Nick, if you can take us a photo using a white paper towel as background, good strong lighting and turn off the flash on the camera, we might be able to give you more information. Regardless, a good buy at 15 bucks.