It occurs in forests, second growth and plantations of cocoa and citrus fruit. The ball nest is built on a bank, tree stump or cavity and the normal clutch is four, sometimes three, red-blotched white eggs, which are incubated by the female.
Adult violaceous euphonias are 11.4 cm long and weigh 14 g. The male has glossy blue-black upperparts and a deep golden yellow forehead and underparts. The female and immature are olive green above and greenish yellow below.
These are social birds which eat mainly small fruit and only rarely take insects. The fruits are mostly mistletoes, epiphyticcacti and Cecropia fruit which are suited for them because of their simple digestive tract. Along with insects, it has been seen to consume terrestrial snails in Brazil.[2] The violaceous euphonia's song is a varied mix of musical notes, squeaks, chattering and imitation.
Members of the genus Euphonia are prized as cage birds and several are threatened by trapping, but this species benefits from its relatively inaccessible habitat.