The municipal coat of arms for Kernen shows six diamonds, the upper three blue and the lower three black, upon a field of yellow. The diamonds are holdovers from the coat of arms of the municipality of Stetten im Remstal, which was itself derived from the arms of the House of Teck, which had been used outright by Rommelshausen. This coat of arms, and an accompanying municipal flag, were awarded to Kernen by the Rems-Murr district office on 3 January 1977.