Gemmula hastula is a species of sea snail, a marine gastropod mollusk in the family Turridae, the turrids.

(Original description by Reeve) The small and slender has an elongate-fusiform shape with a long, almost straight siphonal canal.

[2] (Description by Melvill) An elegant tornate species, with produced siphonal canal, and spiral ribbing somewhat similar to that of Tomopleura nivea (Philippi, 1851), but more regular.

Just below the sutures these carinae are spirally deeply punctulate, an item omitted in the original description.

[3] This marine species occurs in the Persian Gulf, the Arabian Sea and off the Philippines