It is known to all that the Windows are the most closely connected with the outside world, and it will often be exposed to the direct sunlight, which will inevitably be eroded by rain. It is quite upset if your window surrounds are cracked because of exposure to the sun for a long time, and go moldy because of the humidity. While using natural stone can avoid this problem, it is waterproof and sun-resistant. After many years the stone can still be shinning and beautiful. It seems that the whole space is connected by the stone when using the natural stone for window surrounds, which provides a visual beauty.
Although the other materials is cheaper than stone, the durability is far from using stone. Years later, you might cost time and money on repair, which is higher than using natural stone, therefore natural stone is cost-effective.