This parameter is applicable only to Round brilliant cut.
Opposite Azimuth is the deviation of azimuth difference between the opposite facets from the ideal value (180°).
Azimuth vectors of all bezel facets and pavilion facets are calculated. Azimuths of the opposite facets are considered, and the difference between them is compared to 180°. This produces the following values:
- Opposite Azimuth (crown to crown): 4 values.
- Opposite Azimuth (pavilion to pavilion): 4 values.
- Opposite Azimuth (crown to pavilion): 8 values.
Opposite Azimuth (symmetry) appearing on the MyAppraiser panel is defined as the maximum of these measurements. As all symmetry parameters, it is an estimate of a deviation from perfect symmetry, and should be zero for an ideal stone.
Reporting
The reported values of Opposite Azimuth include: 4 independent measurements for crown facets, 4 for pavilion facets, 8 of those measured between the crown and pavilion facets, summary parameters (Avg, Min, Max, Dev) for each of these subsets, and the overall maximum.
| Reported in | Section | Values | Units | Bookmarks |
|---|---|---|---|---|
Full Report for Brilliant | Main Parameters | Avg, Min, Max, Dev (crown to crown) | ° |
|
Avg, Min, Max, Dev (pavilion to pavilion) | ° | PAV_OPPOSITE_AZIMUTH_AVG, | ||
Avg, Min, Max, Dev (crown to pavilion) | ° | PAV_CRN_OPPOSITE_AZIMUTH_AVG, PAV_CRN_OPPOSITE_AZIMUTH_MIN, PAV_CRN_OPPOSITE_AZIMUTH_MAX, PAV_CRN_OPPOSITE_AZIMUTH_DEV | ||
| Overall maximum | ° | OPPOSITE_AZIMUTH_SYM_DEG | ||
| Detailed Parameters | All 4 values (crown to crown) | ° |
| |
| All 4 values (pavilion to pavilion) | ° | PAV_OPPOSITE_AZIMUTH_1, ..., PAV_OPPOSITE_AZIMUTH_4 | ||
| All 8 values (crown to pavilion) | ° | PAV_CRN_OPPOSITE_AZIMUTH_1, ..., PAV_CRN_OPPOSITE_AZIMUTH_8 |
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