Dilute tortoiseshell describes a coat, not a breed. Where a standard tortie mixes black and orange, a dilute shows blue-gray and cream in patches or a soft marbled blend, thanks to a recessive dilution gene a cat must inherit from both parents. The pattern depends on two X chromosomes, so nearly all dilute torties are female. Most are domestic shorthairs or longhairs, though the coloring also appears in Persians, British Shorthairs and Maine Coons.
Because color says little about personality, dilute torties can be shy, outgoing, cuddly or independent. Size and coat follow ancestry: most weigh 6 to 14 pounds, shed moderately and live 12 to 18 years. Spend time with the cat you're considering and weigh age, coat length and energy level more heavily than the tortitude folklore.