Helium help : Comprehensive list of report parameters
Pavilion depth

Applicable to any cuts

The definition has been updated. Follow the link for more details.

The pavilion depth is measured using main pavilion facets. It is measure for each main facet and then the average, minimum, maximum and deviation values are calculated. The software finds the lowest vertex of the whole model (it is one of the vertices of the culet or pavilion) and the highest vertex of each main facet.

Crown heights

Pavilion depth 1. If the main facet reaches the girdle in its highest vertex, the height between the found vertices is considered to be the height of the pavilion for the given main facet, as shown on the figure below.

Crown height 1

Pavilion depth 2. If the main facet does not meet the girdle, the corresponding vertex is substituted by the edge of the girdle measured at the azimuth of the highest vertex of the main facet, as shown on the figure below.

Crown height 2

If there are extra facets on the girdle, a virtual model without these facets is created and used for the measurement. To build the virtual model, the extra facets are removed and the neighboring facets are continued until they intersect.

Pavilion depth: ideal model

DiamCalc Brilliant Cut Parameters