Pearl
The Pearl is a white pattern and produces a white hamster ticked through with coloured hairs.

Imperial
The Imperial is a 'white bellied' mutation which gives the hamster an almost white belly and reduces the amount of coloured hairs in the white areas on the sides. There may also be some white hairs in the top coat. The Imperial can be combine with the normal colour to produce the Normal Imperial or with the Sapphire to produce the Sapphire Imperial.