It is a pierced earring of the night light shell.
The largest cherry tree in the world is the largest pearl layer in the shell, and the rainbow colored pearl layer is called Rainbow shower, and it is also valued overseas. It has been used in Okinawa since the past. Night light shell is a handmade craft made by Okinawan craftsmen.
* Note for purchase
The shellfish product is different from the color of the image. Please understand.
||About 20 mm in diameter
||Night light shell