Tri-Stone, Inc. Architectural Cast StoneOver 30 years of architectural cast stone experience. A Midwest based company. Residential and Commercial services, including custom fireplaces.cast stone productsinclude,Cast stone, precast concrete, GFRC textures - Ventura Cast StoneCAst stone, precast and GFRC textures. . These products include: cast stone, line, precast concrete, precast, cast, stone, line, sandstone, los.