The term 'necklace parts' can refer to a variety of components that make up a necklace, such as clasps. Clasps are small pieces of hardware used to fasten two ends of a necklace together. They come in a variety of shapes and sizes, and can be made from different materials such as metal, plastic, or wood. Clasps are an essential part of any necklace, as they provide the necessary security to keep the necklace in place.