Born in Rome, Gemma first worked as a stuntman, then was offered real acting parts by director Duccio Tessari, starting with the film Arrivano i titani (1962). He also made an appearance in Luchino Visconti's Il Gattopardo as Garibaldi's General.
Gemma, an actor born in Rome, started his career as a stuntman before transitioning to acting roles under the direction of Duccio Tessari, who gave him his first role in "Arrivano i titani" (1962). He also appeared in Luchino Visconti's "Il Gattopardo," playing Garibaldi's General.