Applicable to:
The model`s diameter is measured in 360 directions
with the step of 0.5 degrees, because opposite directions
apply to the same diameter. The diameter of the model 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 model lay between these planes. The **minimum**,
**maximum** and **average diameters**, **width** and **length, diameters perpendicular to minimum and maximum ** are calculated using this array
of values.
Brilliant
The parameters are calculated for brilliant:
- Minimum diameter
- Maximum diameter
- Average diameter
- Width - Minimum diameter
- Length - Maximum diameter
- Diameter deviation
The **diameter deviation** in millimeters is a mere
difference between the maximum and minimum values of the parameter.
In addition to this deviation, there is a relative diameter
deviation parameter that is calculated by the following formula:
(D_{max}/D_{min} - 1) * 100%.
Rounded Fancies / Marquise, Oval, Pear
The parameters are calculated for rounded fancies:
- Maximum diameter
- Length - Maximum diameter
- Width - minimum in the direction +/-10 degree perpendicular to Length
- Minimum diameter
Rectangular Fancies / Princess, Radiant
The parameters are calculated for rectangular fancies:
- Minimum diameter
- Width - Minimum diameter
- Length - minimum in the direction +/-10 degree perpendicular to Width
- Maximum diameter
StepCuts / Emerald
The parameters are calculated for emerald:
- Minimum diameter
- Width - Minimum diameter
- Length - minimum in the direction +/-10 degree perpendicular to Width
- Maximum diameter
StepCuts / Trapezium
The parameters are calculated for trapezium:
StepCuts / Triangle
The parameters are calculated for triangle:
- Minimum diameter
- Diameter 1 - Minimum diameter
- Diameter 2 - extreme in the range +-30 degree in the direction 120 degree from Diameter 1
- Diameter 3 - extreme in the range +-30 degree in the direction 120 degree from Diameter 1
- Width - Minimum diameter
- Length - maximum in the direction +/-10 degree perpendicular to Width
Unknown cuts
The parameters are calculated for unknown cuts:
- Minimum diameter
- Width - Minimum diameter
- Length - extremum (minimum or maximum) in the direction +/-10 degree perpendicular to Width
- Maximum diameter
All parameters that are measured in millimeters have corresponding percentage values. These percents are calculated relative to **average diameter** for brilliant or **width** for other cuts.
**Comprehensive list of the Helium report parameters:**
**Measurements are used in different systems and tools:**
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