Capiz
Capiz are shells found in a province in the Philippines called Capiz. These flat, semi-transparent shells with a pearlescent appearance are edible but valued more for the shells. Capiz shells have been used for thousands of years as a glass substitute because of their durability and translucence. More recently Capiz shells are being used for decorative items like chandeliers and lampshades and other shell inlays.
Highly asymmetrical bivalve with a characteristically thin, semi-translucent shell.
The Capiz or window pane oyster, with its scientific name, Placuna placenta, can grow up to 70-150mm. The shells have been used for thousands of years as a glass substitute because of their durability and translucence.
See material catalog here.