The three main Lab colors remain black, which is the most popular, then yellow, then brown. The rarest Lab is the silver, which is actually a chocolate Lab with a dilute gene that gives it a silver-gray coat. They are often mistaken for Weimaraners, or thought to be Weimaraner-Lab crosses, but they are 100 percent Labrador. There are also champagne, white, and red Labs, all of which are simply color variations of the yellow. Charcoal Labs, like silvers, have a dilute gene that lightens black coats to a charcoal gray.