Pearls from Cassidae can be found in different size and shape from round to drop , oval or baroque. Colours can be white to orange or brown. The best show a similar flame structure of the conch pearls.
Most members of this family are small sand-dwellers but a few members grow to impressive sizes and weights. The shells are heavily calcified and have teeth either just inside the lip or along the very outer edge.
Cassis Cornuta and Cassis Rufa live mostly on open sand bottoms where they often spend their time buried in the sand when not hunting. They prey consist primarily of sand-dwelling sea urchins which they locate chemically. After their prey is located, they begin by removing the spines from an area on the urchin then bore a hole trough which to extract the animal.