This parameter is applicable only to Round brilliant cut. |
Vertex Azimuth is the angular deviation of the vertices' azimuth angles from ideal values.
For all groups of symmetrically equivalent vertices (see the picture), all pairwise azimuth differences are calculated and compared to the ideal values. The deviation from the ideal value is the Vertex Azimuth. See the details below.
To locate the vertices of each type, the following procedure is performed with each of the corresponding facets:
Type | 1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|---|
Facet | Star | Bezel | Upper girdle | Lower girdle | Pavilion |
Pivot point | Bottommost | Bottommost | Topmost | Bottommost | Bottommost |
Two point furthest from the line on each side are located.
Whether or not the vertices of one facet coincide with the vertices of the same type belonging to the neighboring facets (as they should in an ideal stone), is irrelevant at the moment |
Reporting
Individual values of azimuth differences between particular vertices are not reported. |