Is it possible to use the same stone and window stone?
If you can use natural stone or cutting tiles can be the same, but artificial stone can only do windowsill board, not suitable for door stone;
Natural stone than man-made stone weatherability, strength, acid and alkali resistance, are better; so the first choice of stone, or a good tile cut done door stone is also very good; because the brick is fired at high temperature; artificial stone is not;
The stone is best to use natural stone; window stone is currently mostly artificial stone, slightly better man-made is commonly used quartz stone;
