Internal characteristics are somewhat easy to see and locate with the naked eye, face up.
Surface characteristics and naturals will protrude beyond girdle.
Characteristics are easily visible through the pavillion. The internal characteristics interfere with light as it passes through the stone, making it dull, with very little "Fire".
Note the large cleavage under the table at eight, (8) o'clock.
This grade diamond is a very common, imperfect grade stone used in "catalog" type jewelry.