...
| Girdle heights calculation method |
|---|
GIA method | Octonus method |
|---|
 Image Modified
|  Image Modified
|
Notes - facet adjacent to the girdle (from any side) with height more than 10° from Total Height is not a girdle facet and never affects girdle height calculation
- steep girdle extra facet has less than 15° deviation from the girdle plane
- shallow girdle extra facet - more than 15°
- a virtual model is built by removing the extra facets and the neighboring facets are continued until they intersect
|
- Steep extra girdle facets are calculated as a part of a girdle.
- Uses real model and excludes Shallow extra girdle facets
during girdle heights calculation.
| - Steep extra girdle facets are calculated as a part of a girdle.
- Uses virtual model built on the real brilliant model
but without Shallow extra girdle facets.
|
 Image Modified
|
|
The following parameters are calculated differently:
...
| Project File with models for this sample | |
|---|
Image Modified
See details on how points are found in the "Finding Points" section of the Stone Heights Calculation page.
...
| Project File with models for this sample | |
|---|
Image Modified
See details on how points are found in the "Finding Points" section of the Stone Heights Calculation page.
...
| Project File with models for this sample | |
|---|
Image Modified
See details on how points are found in the "Finding Points" section of the Stone Heights Calculation page.
...
