A grave marker is an object used to mark the location of a grave. Common grave markers include stones, headstones, stelas, tombs, accents, and steles. Stones are usually small and made of rock or other hard material, while headstones are larger and made of STONE, metal, or wood. Stelas are tall, thin monuments made of STONE, and tombs are large structures that may be made of STONE or other materials. Accents are decorations added to a grave marker, and steles are large, upright monuments made of STONE.