The application of grout that fills the gaps, interstices between the tesserae is the final act of creating the mosaic. The grout will transform the separate pieces of tesserae into a unified, coherent design.

Grouting can be the scariest and the most rewarding part of a project. As you stare at hours of work a million things spin through your mind. What color? What kind of Grout? Where do I start? What if.......? You know that how your grout will make or break your mosaic artwork. The following sections contain tips and guidelines that will hopefully relieve some of your anxiety. Grout is optional, there are many materials that do not invite the grouting process including stone, shells, pebbles, smalti, and found objects.