Exquisite Elegance: Fancy Necklace Collection When you shake and knock an entire string of pearls, the real pearls will have a softer more comfortable sound and the fakes will sound thin or tinny. If you bite a real pearl and scrape it slightly with your teeth, you can feel and hear the sandy, grainy surface of the pearl. But a fake pearl will be slippery with no sound. And if the fake is plastic, sometimes your teeth will make depressions in the pearl. See More: https://timelesspearl.com/collections/necklaces-pendants