Fish Eye diamond is a diamond with less Cuting good that diamonds do not even shine less bright at all, seem not loosened as eye blinking or eye fish snake.

This is because:

1. Girdle is too wide so that the incoming light reflected from the crown should pass gidle reflected back through the crown. (See figure below.)


2. Pavilion is too short, the incoming light is reflected out through the crown through the Pavilion, this led to the diamond does not shine.


3. Pavilion is too long, light coming through the crown and reflected Pavilion to the crown but not straight out.