Black pearls are produced which very few are suitable for jewellery, as the majority of them crack when are taken out of the sea. As is typical with the Pinnidae, the shell is elongated and wedge-shared, coming to a point at the anterior end. There are ridges running lengthways, and spines arise from these towards the posterior edge. The exterior of the shell is an olive brown. The interior is nacreous to about half its length, and there is a conspicuous scar in the centre of the shell at the border of this area, where the posterior adductor is attached. This species is preyed upon by starfish, and other carnivorous gastropods, including the horse conch.