Keshi pearls, also referred to as poppy seed pearls or seed pearls, can originate from either saltwater or freshwater sources, and they possess a distinctiveness in their formation. These pearls can be created in various ways, such as when the irritant introduced to the mollusc is expelled before the pearl fully develops or when the nucleus fractures, allowing the pearl sacs to continue growing without it. As a result, keshi pearls exhibit irregular and often asymmetrical shapes. Since these pearls grow without a nucleus, they remain small, typically only reaching a few millimetres in size.