A further distinctive feature is that a significant proportion of both Panda and Snap Lake productions are coated with impure diamond. In the larger sizes, the coat may be so thin as to be almost transparent, but more generally, it forms an opaque cover over a clear diamond. In the smaller sizes, additionally, some diamonds have nucleated as opaque cubes, interpenetrant cubes, or diamond with a more complex shape, such as cubo-octa-dodecahedra.