What is Helium Polish and who benefits from it
What is new in the Helium Polish?
Versions history
Documentation for Helium Polish releases
Advantages for analyzing girdle asymmetry and removing girdle asymmetry
Scanning major and minor symmetry features
Measuring diameter of girdles with a conical shape, "CZ" sample
Photoreal image of Helium Polish 3D model
What is new in the Helium Polish reports?
Reports history

Customizing printing and viewing reports
Customizing export data
Customizing MS Word report templates
Customizing internal text report template
Helium Polish Illustrated reports (one page reports)
Reports for semipolished diamonds and arbitrary cuts
Recut reports
Helium Polish download

Helium Polish Highlights (PDF)
Helium Polish system manual (PDF)
Helium reports documentation (PDF)
Cut parameters
Creating and customizing pricelists (PDF)
DiBox 2.0
GemAdviser Free Version
Helium IG
Helium Polish
Helium Rough
Helium Tender
M-Box 2.0
M-Box 1.5
Oxygen DZ
Oxygen HIG
Oxygen Immersion
Oxygen Inclusion
Oxygen Microscope Server
Oxygen Viewer Free Version
Oxygen XRay Server
Pacor Client
Stereo Viewer Free Version

PACOR - Advanced Computer technologies for Processing of Rough diamonds
Laser Mapping of Concavities
Scanning major and minor symmetry features
Technology patent "A method and apparatus for locating inclusions in a diamond stone"
Immersion Glass
Helium help : Comprehensive list of report parameters
Girdle thickness

Applicable to:

  • Brilliant
  • Rounded Fancies / Marquise, Oval, Pear

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

The girdle thickness is measured in 720 directions in steps of 0.5 degrees. The thickness of the girdle any given direction is measured by intersecting the vertical plane that defines the direction with the facets that constitute the girdle. The software finds the upper and lower points of the intersection between the girdle and the vertical plane. The difference between the Z coordinates of these points (along vertical axis) is the final thickness of the girdle in the given direction.

If there are extra facets on the girdle, they are included into the girdle for the purposes of this measurement. Unlike Crown height or Pavilion depth measurements, no virtual model is used.

Girdle thickness: extra facets

The obtained arrays of values are used to draw the involutes of the girdle surface and to determine the bezel, valley and bone girdle thicknesses. The valley, bezel and bone girdle thicknesses may be measured in at most 16, 8 and 8 points accordingly for most rounded cuts. These girdle thicknesses are measured using a virtual cut without Extra facets.

Firstly the valley girdle thicknesses are calculated. The whole girdle is separated into segments that correspond to crown upper facets and pavilion halves. These segments indicate areas on the girdle with the minimum thickness, i.e. valley girdle thickness. The software searches for the minimum of the girdle thickness within each segment and remembers the azimuth of the found minimum.

In their turn the found minima break the girdle into areas which contain thickness maximums (bezel and bone). The software searches for the maximum of the girdle thickness within each area and remembers the azimuth of the found maximum.

For each type of girdle thickness the software calculates the average, minimum, maximum and deviation of corresponding values.

Comprehensive list of the Helium report parameters:

Measurements are used in different systems and tools:

DiamCalc Brilliant Cut Parameters