Diffuser necklaces are a type of jewelry designed to hold and diffuse essential oils. They typically feature a small pendant that contains a porous material, such as felt or lava stone, which absorbs the oils. When worn, the heat from the body helps to release the fragrance, providing a subtle aroma throughout the day. These necklaces come in various styles and designs, making them both functional and fashionable. Many people use diffuser necklaces for aromatherapy benefits, as different essential oils, like lavender or peppermint, can promote relaxation or focus. They are popular among those who enjoy the therapeutic properties of essential oils.