Giulia was born in Perugia when her father, José Carlos Gam Heuss, was taking a course.

Giulia's biography registers a respectable stage career, from which she was chosen for her debut in Rede Globo, Giulia played the character Jocasta, when young, in the telenovela Mandala (the adult Jocasta was portrayed by actress Vera Fischer).

Giulia came to the telenovela without any experience in television, other than some ads and videos made by friends from an independent film company.

In the stage, Giulia debuted under direction of Antunes Filho, in the Shakespeare's play Romeo and Juliet, in São Paulo, in 1984.

In January 1987, back to Brazil, Giulia joined the cast of the Jean Racine play Phèdre, invited by actress Fernanda Montenegro.