Campylopterus diamantinensis is a hummingbird from the highlands of Minas Gerais, Brazil. A 2017 study described the tail pattern of the population now treated as this species, when it was still considered a subspecies.
In the population later separated as this species, a 2017 study describes bronze-green tail bases, a dark olive-grey band, and white tips.
High-elevation grasslands with rocky outcrops and shrubs in Minas Gerais are described as habitat for the species.
An extinction-risk assessment has not been added yet.