Rhomboceros

by Arya Akhavan (November 2012)
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Gemology Projectopen
L/W
136%
Design RI
1.69
H/W
65%
Gear
96
V/W³
0.316
Symmetry
2 (mirrored)
Facets
75
Tiers
22
Crown
27
Pavilion
48

I've always wondered how to cut a rhomboid checkerboard, so I decided I would mess around. I still haven't figured out how to "properly" do it, so I just took a 3x3 square checker and stretched it. Ah well... I prefer this in tanzanite, but can be cut in materials from beryl to rutile (RI = 1.58 - 2.62) with no changes. Suggested length = 10-15 mm

Wireframe

Rhomboceros 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
 3455193
Set stone width.
G290.00°
 6425490
Meet P1, G1, P4
G390.00°
 9395787
Meet P4, G2, P6
G490.00°
12366084
Meet P6, G3, P7
G590.00°
2472
Meet P7, G4, P8
P747.39°
12366084
Meet P4, P5, P6
P847.27°
2472
Meet P4, P5, P6, P7
P647.00°
 9395787
Meet P4, P5
P443.70°
 6425490
Meet P1, G1, P3
P541.83°
 5435391
Meet P1, G1, P3, P4, G2
P340.89°
 4445292
Meet P1, P2
P140.75°
 3455193
Cut to centerpoint.
P240.09°
 2465094
Meet P1, G1

Crown

#AngleFacetsNotes
C550.18°
2472
Level girdle.
C147.09°
 3455193
Set girdle width.
C241.78°
 6425490
Level girdle.
C339.45°
 9395787
Level girdle.
C438.13°
12366084
Level girdle.
C616.43°
9648
Meet C1, C2
C810.85°
2472
Meet C3, C4, C7; C4, C5
C79.88°
 9395787
Meet C2, C3, C6
T0.00°
24
Meet C6, C7; C7, C8