To provide a small and light stud earring with simple outer appearance, by which light is emitted in the favorite color of a user without burden on an ear, the color is changed to suit a user's mood each day, etc., a friction post to be put through the pieced hole of the ear is easily cut in response to the thickness of the ear of the user, and merchandizing is actually performed to meet the needs at a low cost.

Not a light emitting diode but a fairy lamp is used as a light source since heavy material and component are not used. Thus, a small button type battery is changed from 3V to 1.5V for small and light conversion or driving is performed by not two but one buttery, and also resistance is not required to use. The friction post at a part to be put through the pieced hole of the ear is made of an optical fiber and adjusted in cutting in response to the thickness of an ear lobe. A rotary plastic disk to be colored, discolored, or colored again is arranged between the fairy lamp and the optical fiber in order to change the light emission color, so that a rendition is provided with color change.