Stomatella duplicata is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

The rather solid shell has a depressed-globose shape with a conical spire.

It is longitudinally striped with purplish or red and white.

Its surface contains numerous fine, unequal spiral threads above and two strong nodose keels at the periphery, and about 7 subequal lirae on the base.

The prominent spire contains three bicarinate whorls, the last notably so.