Description: The necklace features a polished, heart-shaped pendant in a solid black material, suspended from a black cord, which often has an adjustable length. Material: While some are made from acrylic or glass, many are made from natural stones like black obsidian or black onyx. Symbolism: Traditionally, a black heart pendant can symbolize grieving, but many people today wear them simply for their stylish, gothic, or Y2K aesthetic appeal.