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 (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.
ReportingThe 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.
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