Applicable to:
- Brilliant
- Rounded Fancies / Marquise, Oval, Pear
Brilliant
Before estimation of the cut parameters the position of the model is normalized. The model is rotated in such a way that the normal to the
table facet becomes vertical, thus the table facet is placed strictly
horizontally.
Then the azimuth of the main pavilion facets is normalized. The model
is rotated around the vertical axis to make the azimuth of one of the
main pavilion facets equal to zero. The software chooses one of the
eight main pavilion facets. It analyzes the parts of the model that
correspond to each main pavilion facet and chooses the one that has
the most deviation from the others. Thus the software tries to find
the defects in the model symmetry and put the model in some definite
position. If the same stone is scanned again, it will be positioned in
the same way with high probability. Please note, that the more
symmetrical is the stone, the more probable it will be positioned
differently in different scans.
As the table facet is placed horizontally, all facet's slope angles
are measured relative to the table facet. As one of the main pavilion
facets is set to the zero azimuth, all facets' azimuth angles are
measured relative to that reference pavilion facet.
Rounded Fancies (Marquise, Oval, Pear)
Before estimation of the cut parameters the position of the model
is normalized. The model is rotated in such a way that the normal
to the table facet becomes vertical, thus the table facet is placed strictly horizontally.
The software measures diameters of the model with the step of 0.5
degrees and finds the direction of the maximum diameter. The model is
rotated around the vertical axis to make this direction the 90 degrees
azimuth. There are two possible positions of the model that puts the
direction of the maximum diameter as the 90 degrees azimuth. The
software analyzes two parts of the model that correspond to opposite
directions and chooses the one that has the most deviation from the
model's center. Thus the software puts the model in some definite
position. If the same stone is scanned again, it will be positioned in
the same way with high probability. Please note, that the more
symmetrical is the stone, the more probable it will be positioned
differently in different scans.
As the table facet is placed horizontally, all facet's slope angles
are measured relative to the table facet.
**Comprehensive list of the Helium report parameters:**
**Measurements are used in different systems and tools:**
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