Applicable to:

• Brilliant
• Rounded Fancies / Marquise, Oval, Pear
• Rectangular Fancies / Princess, Radiant
• StepCuts / Emerald, Triangle
• Unknown cuts

The diameter of the table facet 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 vertices of the table facet lay between these planes (similarly to usual diameter).

Brilliant

There are 4 diameters of the table. These diameters are measured using main pavilion facets for determining the directions of measurement. Azimuths of each pair of opposite main pavilion facets define the direction, in which the table diameter is measured. All relative table diameters are calculated using average model diameter. The software calculates average, minimum, maximum table values using these 4 parameters.

Rounded Fancies (Marquise, Oval, Pear)

Only two diameters of the table are measured for the rounded fancies cuts: along minimum and maximum diameters. The table is measured using main crown facets for determining the directions of measurement. Azimuths of two pairs of opposite main crown facets define the direction, in which the table diameter is measured. The relative table diameters are calculated using main diameters measured in the same direction. The software calculates average, minimum, maximum table values using these 2 parameters.

Comprehensive list of the Helium report parameters:

• Position normalization
• Diameters, Width & Length
• Main diameters
• Ratio (L/W) & Girdle Ratio
• 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
• Girdle types for cushion as red, yellow, green and blue
• Corner angle width and Corner angle length
• 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