Chrysozephyrus brillantinus is a small butterfly found in the East Palearctic (Ussuri, Northeast China, Korea, Japan) that belongs to the lycaenids or blues family.

The black border to the upperside is considerably broader than in the preceding forms.

This species differs from smaragdinus in the underside being much darker, so that the markings are less prominent.

The females have, as in taxila and the other golden green species, sometimes pale yellow spots on the forewing or some metallic scaling similar to that of the males .

Larva coppery brown, with a dark dorsal line and on each segment a pale oblique spot, the joints between the segments also being pale; on oak.