PC 45.115

THE CHICAGO CUT

Designed by Jim Perkins Copyright February 26, 2003
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DataVueopen
L/W
100%
Design RI
2.15
H/W
62%
Gear
96
V/W³
0.202
Symmetry
12 (mirrored)
Facets
85
Tiers
8
Crown
12
Pavilion
73

Average face up brilliance RI-2.15 ISO=92.9% COS=76.7%

The crown on this design is a chanllange. However, it does work if you are careful. In order to obtain good meets you will need to polish them into position and will want to use either a ceramic or corian lap. Otherwise,

Wireframe

THE CHICAGO CUT 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
 41220283644526068768492
Cut to size.
P143.50°
 41220283644526068768492
TCP.
P242.00°
 21018263442505866748290
PCP, GMP.

Crown

#AngleFacetsNotes
C138.33°
 41220283644526068768492
Cut girdle width,level girdle.
C233.50°
 81624324048566472808896
GMP.
C329.80°
 41220283644526068768492
MP;C1,C2.
C423.40°
 81624324048566472808896
MP;C2.
T0.00°
96
MP; C3.