Effect of diamond

Fish eye effect

 If your diamond is too shallow, like depth percentage 45% then diamond will not leak light but create a weird dark ring around the pavilion that looks like fish eye.

Nail head diamond

If your diamond is too deep on the other hand, like depth percentage 73% then your diamond will look dull, dark and lifeless.

Ideal Percentage

Diamond is cut in a such a way that it maximize light and give much of fire, sparkle and brilliance possible from the stone.