... shell mosaic natural color or dyed non-radiative, no pollution, waterproof, friendly environmental Mother of pearl shell ... of pearl shell (whtie mop, black mop, river shell ), capicz shell, abalone shell etc.2.Backing: Poly mesh Mesh, Acrylic, ... 20 mm;4.Color:natural color or tinct5.Shell slice shape: Square , rectangle , triangle, hexagon, irregular etc ... Pictures mother of pearl shell mosaics tiles