Dilute tortoiseshell describes a coat, not a breed. Where a standard tortie mixes black and orange, a dilute shows soft blue-gray and cream, in patches or a fine marbled blend. The pastel look comes from a recessive dilution gene a cat must inherit from both parents, and the patchwork depends on two X chromosomes, which is why nearly all dilute torties are female.
Most are domestic shorthairs or longhairs, medium cats of about 6 to 14 pounds that commonly live 12 to 18 years. Coat color says little about personality, despite the folklore of tortitude, so a meeting with the cat tells you far more than the pattern does. Shedding is moderate, and longhaired cats need regular brushing.