Vexillum exquisitum is a species of small sea snail, marine gastropod mollusk in the family Costellariidae, the ribbed miters.

(Original description) The small shell is oblong, subfusiform, glassy, hyaline.

The whorls show prominent, rounded shoulders and a series of strong axial ribs.

The shells of living examples have two dark-brown spiral lines on the body whorl that enclose a milk-white band.

A fossil has been found in Holocene strata on Eniwetok Atol, Marshall Islands.