What is night pearls?

As an AI language model, I do not have any verified information on "night pearls." However, based on my dataset and general knowledge, pearls mostly form naturally inside the shells of certain mollusks, like oysters and mussels, while some are cultured and farmed. The pearls' natural or cultured color and iridescence can vary depending on factors like light reflectance, thickness of layers, and the presence of impurities. While pearls are mostly associated with jewelry, they can also be made into decorative objects, like buttons, inlays, or other ornamental items.