The depth of a diamond is the distance between the table facet and the culet measured in millimeters. The depth of a diamond is expressed in percentages.
Mathematician and gem enthusiast Marcel Tolkowsky (who developed the round brilliant cut) defined the ideal dimensions as:
- Table percentage (table diameter divided by overall diameter) = 53%
- Depth percentage (overall depth divided by the overall diameter) = 59.3%
- Pavilion Angle (angle between the girdle and the pavilion) = 40.75°
- Crown Angle (angle between the girdle and the crown) = 34.5°
- Pavilion Depth (depth of pavilion divided by overall diameter) = 43.1%
- Crown Depth (depth of crown divided by crown diameter) = 16.2%
Blue Nile‘s Round Cut Grading Proportions
