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For an explanation about how to distinguish girdle extra facets from the adjacent crown and pavilion extra facets and how to distinguish steep and shallow girdle extra facets, see GIA vs Octonus Girdle Heights Calculation Methods. |
Below you can find several examples of how the virtual model is built.
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On the picture below you can see how during building the virtual model, the pavilion extra facet and two shallow girdle extra facets are excluded and steep extra girdle facet is left in its place (it will be calculated as the part of the girdle).
Note how in areas where the excluded facets were situated, the neighboring facets were continued until intersection which changed the shape of the girdle curve.
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On the picture below you can see how during building the virtual model, the crown and pavilion extra facet are excluded and in areas where they were situated, the neighboring facets were continued until intersection which changed the shape of the girdle curve.
Note that the crown and pavilion extra facet are excluded only in case of RBC - in other cuttings in the virtual model they remain in their places.
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On the picture below you can see how during building the virtual model, the pavilion and crown extra facets and shallow girdle extra facets are excluded and steep extra girdle facet is left in its place (it will be calculated as the part of the girdle).
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