Hi, Ronald. The repair for marble is colored epoxy that is blended to match the color of the marble. Aside from the art of blending the color, this will also require diamond polishing discs to level the epoxy that must squeeze out of the joint. This is a repair for a pro, not just because of the color blending, but because the cost of the tools is prohibitive for a do-it-yourselfer to buy. If you have a problem finding someone to do the work, ask the people at your biggest local cemetary where most of the marble stones come from. The same marble workers do both jobs.