The Pearl mutation appeared in the UK in 1988. The Pearl is a white pattern mutation which causes the belly and back to be white allowing only a sprinkling of coloured hairs on the back. The coloured hairs are concentrated along the spine. The amount of coloured hairs varies immensely with some Pearls being white except for a concentration of coloured hairs along the spine and others being heavily ticked through with colour.
Until recently it was thought that all Pearl males were sterile but some have been found to be fertile.
The Pearl mutation can be combined with any colour and so it is possible to produce a Normal Pearl with black hairs ticked through the coat and a Sapphire Pearl with purple-grey hairs ticked through the coat.