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The definition has been updated. Follow the link for more details.
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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. HPOxygen 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 may be treated in two different ways
- in case if the extra facet has less than 15° deviation from the girdle (steep girdle extra facet), the extra facet is included into the girdle for the purposes of this measurement
- more than 15° (shallow girdle extra facet), the extra facet is not included.
Unlike Crown height or Pavilion depth measurements, no virtual model is used.
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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.
Girdle Valley
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This parameter is applicable to the following cuts: Round brilliant, Marquise, Oval, Pear, Heart. |
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. HPOxygen searches for the minimum of the girdle thickness within each segment and retains the azimuth of the found minimum.
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Girdle Valley (symmetry)
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Calculation Search for "valley" in Stone Heights Calculation. Reporting
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Note the non-standard naming of the percentage values (no " Visualization in Appraisers
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Girdle Bezel
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This parameter is applicable to all cuts, though the number of individual values may vary. |
The minimal values of girdle thickness (the locations of girdle valley measurements) break the girdle into areas which contain thickness maximums (bezel and bone). HPOxygen searches for the maximum of the girdle thickness within each area and retains the azimuth of the found maximum.
For each type of girdle thickness, the average, minimum, maximum and deviation of corresponding values are calculated
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Girdle Bezel (symmetry)
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Calculation Search for "bezel" in Stone Heights Calculation. Reporting
Visualization in Appraisers
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Girdle Bone
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This parameter is applicable to the following cuts: Round brilliant, Marquise, Oval, Pear, Heart, Princess. |
The minimal values of girdle thickness (the locations of girdle valley measurements) break the girdle into areas which contain thickness maximums (bezel and bone). HPOxygen searches for the maximum of the girdle thickness within each area and retains the azimuth of the found maximum.
For each type of girdle thickness, the average, minimum, maximum and deviation of corresponding values are calculated
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Girdle Bone (symmetry)
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Calculation Search for "bone" in Stone Heights Calculation. Reporting
Visualization in Appraisers
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Girdle Height Correlation
Alias: GirdleHeightCorrelation
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This parameter is applicable to the Oval cut. |
The maximum difference between the bezel and bone heights. The parameter shows how well a Girdle is leveled in the areas of bezel and bone: the less the value is, the greater the leveling.
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Calculation So we measure the height of every Girdle bezel and take the maximum from obtained values, we measure the height of every Girdle bone and take the minimum from obtained values, then calculate the difference between this maximum and minimum. This is the first number. Then from Girdle bones, we take maximum, from Girdle bezels - minimum, then calculate the difference between this maximum and minimum. This is the second number. Then we take maximum from these two numbers. This is our parameter. For detailed information about Girdle bezel and Girdle bone, see corresponding sections in the Girdle Thickness article. The detailed description of how Girdle bezel and Girdle bone are defined and used in the system is presented in the New measurements of Heights for Pavilion and Girdle section of the OctoNus site page.
Recut > Appraiser = "MyOvalOpt | MyOval" or "MyOvalPlus | MyOvalPerformanceWare > Show Editor > the Symmetry tab. Reporting
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