Marble can be cut on site.
Now there are a variety of hand-held electric stone cutting tools to facilitate on-site, for the use of cutting stone.
Most of the general construction stone are in a certain size of the plate. In the construction, according to the size situation and environment, the plate size need to be modified a little bit to meet the desired requirements. In some cases a larger mobile cutting equipment might be needed. You can even carve stone on site. Either way needs to negotiate with the merchants.