Teardrop 2 1/2" , 3" you can creat various design on this shape. It can also be use for earings.
Black limpet (Cellana exarata Nuttall )The oval,moderately arched shell is marked with distinct black radiating ribs with lighter color between the ribs.It reaches a length of 1 ½ in. (38 mm) is found among rocks near shore in Hawaii-where it is sold in fish markets as opihi. Common.