The town's arms might in English heraldic language be described thus: Argent a cramp palewise sinister with a crossbar gules between in dexter chief a rose foiled of six of the second barbed and seeded proper and in sinister base an acorn slipped palewise of the second.
The charges are drawn from coats of arms formerly borne by both Idar and Oberstein before the two towns were merged in 1933.