Freshwater Shell Slice Mosaic Tiles Mother of Pearl tiles were created by tile artisans who inlay the jewelry boxes. The natural iridescent finish and glittering marks on shells are deeply loved by customers. The freshwater shell slice tiles are made of natural freshwater shell which are mostly in white and yellow color with gray or pink marks. The natural shells can be polished into different shapes of mosaics such as rectangle, square, round, ellipse, diamond, and hexagon. All the small chips will be mounted on a 12''x12'' mesh to be one sheet of tile. These tiles are in 2 mm thick. It is easy for cutting during installation by following joint lines.