Ratio (L/W) and Girdle Ratio

Applicable to All

Ratio (L/W) and Girdle Ratio are different parameters, but generally have equal values.

Ratio (L/W) = Length / Width
Girdle Ratio = (Diameter perpendicular to Minimum Diameter) / Minimum Diameter

Read detailed description about Width, Length and Diameters for different cuts.

Corner Ratio

Applicable to:

• Step Cut
• Princess
• Cushion
• Radiant
• Square radiant

Corner Ratio = Diameter: Corner (Max) / Diameter: Corner (Min)

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