I love these certain shells that I love. I call them shiny shells. They are Jingle Shells aka Mermaid Toenails. They come in a variety of colors and are a type of clam shell. I've found them in orange, yellow and white. They are small colorful and shiny. Who doesn't like shiny things?
I took a small drill bit in a pin vice and drilled holes in them. I opened the the loop at the end of a set of hook earrings and put them though the hole in the shell...closed the loop back up and you got a pair of shell earrings.