A chimneypiece refers to the ornamental framework or surround that is placed around a fireplace. It often includes a mantelpiece or mantelshelf above the firebox and may consist of various decorative elements such as columns, carvings, mouldings, and other adornments. The chimneypiece serves as both a functional and decorative feature of a fireplace, adding aesthetic appeal to the room and providing a focal point for the space. Mantel shelf. Ornamental structure, of stone or marble, with molding, carving - around the open recess of a fireplace.