Percentages need a reference
Table and depth percentages describe proportions relative to the report's stated measurement convention. A percentage by itself is not a visible size or a complete cut-quality judgement.
Check the actual dimensions
Length, width and depth reveal how the weight is distributed. Compare stones of the same shape, and use visual evidence to assess the result. Avoid treating one supposedly ideal percentage as a rule for every shape and facet arrangement.
Sources and further reading
This English edition draws on the source material referenced below.