Abstract: A mold for manufacturing a simulated stone product includes a flexible layer having a mold cavity in the shape of the simulated stone product. The flexible layer includes a first surface in which the mold cavity is formed and a second surface opposite the first surface. The mold also includes a structural foam that conforms to the shape of the second surface of the flexible layer and provides support to the second surface. The mold further includes a plastic tray holding the structural foam and the flexible layer. Also described are a plastic tray for constructing a mold to manufacture a simulated stone product, and a method of manufacturing a simulated stone product.