Cast stone overmantels!@.. Go the extra mile. Chose from a wide selections of cast stone overmanel designs or create your own. Your overmantel can be whatever you want it to be. Here are some create designs with all the parts necessary to create them included. OR, you can go to the flat stock and trim page and hand pick the components to make your own design. Whichever you do, adding an overmantel places you apart from the crowd. There is nothing like a cast stone overmantel fro HearthCo to set your fireplace apart for the ordinary. Choose from HearthCo’s contemporary and traditional cast stone mantels overmantel products. To choose from our incredible selection of cast stone mantels pick the image that comes closest to what you are looking for.