Pietra Gray Marble: Pietra Gray Marble is the most notable Iranian stone, which features a sophisticated gray background that can range from light to dark, accented with striking white veins. This stone is known for its durability and very low water absorption, making it ideal for step treads and interior walls. However, it is not recommended for building façades, as prolonged exposure to sunlight may cause its black coloration to fade to gray. Proper sealing can prevent this issue. Pietra Gray is widely used in public spaces such as lobbies, cafés, cinemas, as well as in bathrooms and even apartment hallways, known for its beauty and uniqueness. Polished and Honed Pietra Gray slabs and tiles, are suitable for flooring, interior walls, and steps. Bush Hammered, Bush Hammered Leather, and Tumbled Peitra Gray slabs and tiles are used for outdoor paving and exterior façades. Chiseled Pietra Grey slabs and tiles are ideal for cladding, landscaping, and building façades. Ashlar and Guillotine Pietra Gray slabs and tiles are commonly used for both interior and exterior building facades. Cubic Pietra Grey stones are perfect for paving streets and sidewalks.