Pearls can be classified into several types based on their origin and characteristics. Natural pearls form inside oyster shells in the ocean, while cultured pearls are formed when a nucleus is inserted by humans. Pearls also differ based on whether they come from freshwater or saltwater sources, and they can have various colors and shapes. Pearl jewelry has become very popular fashion items in recent years. While real pearl jewelry can be expensive, wholesale handmade pearl jewelry offers a more affordable option. The document recommends buying pearl jewelry in groups to save money and introduces the jewelry supplier Aypearl.com.