The male Arhopala centaurus has a purplish blue upper wing with a dark, thread-like outline on the front, while the female is paler with a broader black outline. The underside of the wing is brown with a dark brown hue and a pale brown border in both sexes. This species has a pointed forewing crest, a white-tipped tail at the tip of 2 veins on the hind wings. In addition to distinguishing this species from the others is the presence of a silvery green line that divides the spots on the forewing cells.
Larva: Arhopala centaurus larvae are yellowish green in color with a reddish band on the dorsal, flat shape with long setae on the lateral and dorso-lateral. At the next instar, the dorsal reddish band gets wider and the color becomes brownish red.
Pupa: Arhopala centaurus pupae are lycaenid, brown, 19-20 mm long.