Necklace Weed Shell. Shell, elongate, conical, imperforate, thick, polished, apex acute; pinkish to brown with distinctive colouration of paired oppositely convex while lines sometimes placed one pair above the other forming a figure 8; red spaced spiral lines cross the centre of the figure 8 axial lines; whorls eight flatly convex, the last rounded at the periphery; two apical whorls smooth and iridescent purple colour; aperture vertically ovale, small, contracted, coarsely ridged and lightly iridescent within, outer lip margined by a subdentate thickening just inside; columella vertical with a strong anterior tooth. Diameter 7 mm., height 15 mm.

There are four colour varieties of this attractive little species.
a.The short white paired lines may be filled in with white so as to almost form white spots.
b.They may have a dark buff filling; contrasting with the white of the lines and the pink or brown of the shell.
c.The filling may form wide broken, cream bars.
d.The paired lines immediately below the suture may he twice as numerous as elsewhere.
This typical Phasianotrochus can be readily distinguished by the colour pattern in spite of its variability within limits. Etym., bellus meaning pretty, the specific name is a diminutive form.