PC 21.220

Barion Octagon Cut

Green, John B; Lapidary Journal, Oct 1998, p181;
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DataVue
L/W
100%
Design RI
2.15
H/W
55%
Gear
96
V/W³
0.177
Symmetry
8 (mirrored)
Facets
89
Tiers
9
Crown
8
Pavilion
81

Green, John B; Lapidary Journal, Oct 1998, p181;

The Pavilion facet numbers indicate the original published cutting sequence. As the designer notes, the size cannot be predetermined with that sequence. Either sequence requires guessing the facet 2 depth.

Wireframe

Barion Octagon Cut 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
 618304254667890
Set size
P148.00°
 618304254667890
Meet 3-3-5
P242.00°
 2101422263438465058627074828694
Cut to TCP
P342.00°
 4 81620283240445256646876808892
Guess at depth
P441.00°
 618304254667890
Meet 2-2-4. Recut facet 2 if reqired.

Crown

#AngleFacetsNotes
C146.00°
 618304254667890
Set girdle thickness.
C235.00°
 618304254667890
Width of step facet as desired.
C327.81°
 4 81620283240445256646876808892
Meet 7-6-6-7
T0.00°
48
Meet 8-7-8