Cebu's are bivalves. They have a top shell and a matching bottom shell hinged together by ligaments. Cebu's are found in the Indo-Pacific region.
You will notice in the listing picture, this clam is highly polished. The silver nacre pearlized inner shell is seen. This shell is highly prized by collectors for its striking shiny nacre. It is hard to capture the true silvery shine of this shell in the picture.