As the name suggests, the Italian crested newt is the largest among newts and can reach a size of up to 25 cm, though it usually measures between 10 and 18 cm.
Its belly is orange, and individual newts can be distinguished by the pattern of dark spots on it. It has a dark-colored throat with light spots, which differentiates it from the other two species.
During the breeding season, males develop a tall, jagged crest on their back. They also have a silvery-white stripe on their tail, which acts as a signal to females.
Females and juveniles often have a continuous yellow stripe along their back.