Can you determine which of these has proper pavilion angles? The bottom illustration is the closest but still outside the acceptable parameters.
The large culet seen in this side view of a diamond, affects the depth dramatically even though the bottom angles are within acceptable parameters.

Shallow pavilion depths are a serious negative when determining proper proportions. These stones are usually fashioned in this way to preserve weight and/or to retain a particular weight category. The only positive for some people is the larger spread of the diamond and possibly, discounted prices for the inferior proportions.

Along with the very small, or absence of, the table reflection, a flat pavilion displays a “fish-eye” (which will be discussed in more detail shortly). This is always considered a very negative characteristic and the stone should be devalued accordingly. Sometimes a diamond with proper pavilion angles, has a large culet that shrinks the pavilion depth below acceptable parameters. This reduces light containment and again has a negative effect on value.