The chief with the countercompony pattern (that is, two horizontal chequered rows) is a reference to the village’s former allegiance to the “Further” County of Sponheim and the "Amt" of Kirchberg. The red bend (slanted stripe) is a reference to the village's later allegiance to Baden. The letter C refers to the municipality's name (once written “Costenz”) and also to the knight Conrad von Costenz, who was mentioned in 1310. The black torc (of the "Wendelring" type) refers to the wealth of archaeological finds made in the grave field from the Hunsrück-Eifel Culture near the Eichelberg.