Applicable to:
 Brilliants
 Rounded Fancies / Marquise, Oval, Pear
 Rectangular Fancies / Princess, Radiant
 StepCuts
 Unknown cuts
Parameters GirdleTable offset by table
axis, GirdleCulet offset by table axis, TableCulet
offset by table axis are values in mm and % from average
diameter or width with possible error:
GirdleCulet offset by table axis 
1.20 ± 0.30, % 
0.048 ± 0.012, mm 
GirdleTable offset by table axis 
0.63 ± 0.28, % 
0.025 ± 0.011, mm 
TableCulet offset by table axis 
1.21 ± 0.32, % 
0.048 ± 0.013, mm 
Program measures offsets as
distance between normals from centers of table (or girdle
or culet) by table axis.
For example, GirdleTable offset by
table axis is distance between normal lying from girdle
center by table and table
center.
Illustrations of crown view and pavilion view have images of table center, girdle center and table center for visualization of described above parameters.
*Diameter of circle on image Girdle center is equal 2% from average stone diameter to visual estimation of symmetry and distance between table, girdle and culet centers.
Estimation Girdle, Table and Culet centers for different cuts
Brilliant
 Girdle center – center of maximum inscribed center (MIC)
 Table center – table centre of mass
 Culet center:
 if culet has facets  culet center is its center of mass
 else culet center is maximum height point
Rounded Fancies
 Girdle center  first created perpendicular to the center of maximum diameter. The center of the parallel to the perpendicular diameter is girdle center.
 Table center – table centre of mass
 Culet center:
 if culet has facets  culet center is its center of mass
 else culet center is maximum height point
Rectangular Fancies
 Girdle center  at the intersection of diagonals
 Table center – table centre of mass
 Culet center:
 if culet has facets  culet center is its center of mass
 else culet center is maximum height point
StepCuts
 Girdle center  at the intersection of diagonals from opposite corners. First diagonal is maximum diameter. Second is the vertical mirror symmetry to first diagonal.
 Table center – table centre of mass
 Culet center  åñëè óäëèíåíèå áîëüøå, ÷åì 1.1, òî ýòî ñåðåäèíà âåðõíåãî îòðåçêà, èíà÷å, if culet has facets  culet center is its center of mass, else culet center is maximum height point
 Culet center:
 if there is a culet segment with lengthening 1.1, culet center is the segment center
 else if culet has facets  culet center is its center of mass
 else culet center is maximum height point
StepCuts / Triangle
 Girdle center  center of maximum inscribed center (MIC)
 Table center – table centre of mass
 Culet center:
 if culet has facets  culet center is its center of mass
 else culet center is maximum height point
Unknown cuts
 Girdle center  girdle centre of mass
 Table center – table centre of mass
 Culet center:
 if there is a big segment includes point near maximum height point and slope less then 5 degree, culet center is the segment center
 else if culet has facets  culet center is its center of mass
 else culet center is maximum height point
