The origin of the vampire race remains a mystery. Contrary to popular belief, in the Twilight universe, vampires deviate from those of traditional myth; a fact often alluded to in the series, usually for humor. For example, all vampires have refined and perfected physical features (including their scent and voice), allowing them to lure in prey.
Their skin is flawless and textured with a marble-like substance much harder and stronger than granite. Due to the crystalline properties of their cells, when a vampire is exposed to sunlight, their body will sparkle like diamonds. For vampires who feed on human blood, their eyes reflect a deep red, as opposed to those who drink animal blood, whose eyes will reflect a medium gold color. Vampires also possess superhuman powers, such as speed and strength. They also have incredibly keen senses and are able to hear for miles and see in total darkness.
Vampires are indeed immortal unless destroyed. Unable to sleep, they spend all days and nights awake. After transformation, a few vampires show special abilities such as foresight or telepathy, usually a prominent personality or physical trait magnified from their human life. Most of them, however, do not. Vampires are unharmed by garlic, holy items, or wooden stakes; they have reflections and shadows, and are able to walk freely in the sunlight without being physically damaged by it.