Applicable to any cuts

Culet diameters are measured in 360 directions with the step of 0.5 degrees (because opposite directions apply to the same diameter). The diameter of the culet in some given direction is measured as a distance between two parallel vertical planes placed perpendicularly to the given direction as close to each other as possible, so that all vertexes of the culet lay between these planes (similarly to usual diameter). The minimum, maximum and average culet diameters are calculated using this array of values.

Comprehensive list of the Helium report parameters:

• Position normalization
• Diameters, Width & Length
• Ratio (L/W) & Girdle Ratio New!
• Main diameters (obsolete)
• Table
• Culet
• Total height
• Crown height
• Pavilion depth
• Upper and lower girdle facets’ heights
• Crown height at girdle minima
• Pavilion depth at girdle minima
• Depth and length girdle facets
• Girdle thickness
• Facets' slope and azimuth angle
• Facets' slope and azimuth angle for rounded fancies (obsolete)
• Azimuths deviation from ideal
• MIC & Girdle to MIC
• Girdle-Table offset (by table axis),
  Girdle-Culet offset (by table axis),
  Table-Culet offset (by table axis)
• Crown painting and Pavilion painting
• Girdle type (obsolete)
• Trapezium parameters
• Extra Facet / Natural
• Twist
• Statistical values

Measurements are used in different systems and tools:

• Lower girdle facets or halves
• OctoNus spread & AGS spread