Calliostoma ornatum, common name the ornate topshell, is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.

The surface of whorls is encircled by spiral lirae uneven in size, and cut into very close compressed granules.

There are about 10 such lirae on the penultimate whorl, but the number is variable owing to the greater or less development of interstitial riblets.

There are generally two or three stronger lirae near the middle or periphery, and this gives at times a slightly bicarinate outline to the body whorl.

[3] This snail is found only from the Cape Peninsula to Port Alfred along the South African coast from the low intertidal to at least 35m under water.