All Siamese cats are basically tan or cream-colored with “points” of brown on the face, ears, legs and tail. Siamese kittens are born “pointless”; the points develop as they age. Over the years, several varieties of points have been perpetuated through breeding.
The classic was the seal point (seal meaning “very dark brown”), but you can also find blue point, chocolate point, lilac point (light brown, not purple), cinnamon point, cream point and fawn point.
Each variety is attractive, and each has fans, though some cat fanciers consider the oldest varieties (seal and blue) to be the only “real” Siamese. Whatever variety they are, all Siamese tend to darken if they spend a lot of time outside.