Tessellation 31 (R)

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Gemology Projectopen
L/W
123%
Design RI
1.54
H/W
70%
Gear
80
V/W³
0.285
Symmetry
2 (mirrored)
Facets
61
Tiers
18
Crown
25
Pavilion
22

by Arya Akhavan (November 2013)

Here's another experiment with pentagons! This one has a very interesting reflection pattern wtih all kinds of scattering. Notice how all of these pentagonal tilings have pentagons and rhombi that fit neatly between them? Works in materials from quartz to CZ (RI = 1.54 - 2.16) with no changes, but I prefer rich pink-flash amethyst. Suggested length = 6-12 mm

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Tessellation 31 (R) 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
 1394179
Set stone width.
G290.00°
 8324872
Meet P1, P2, G1
G390.00°
12285268
Level girdle.
G490.00°
2020
Level girdle.
P544.90°
12285268
Meet G2, P3, P4
P344.90°
 8324872
Level girdle.
P644.74°
2060
Meet P4, P5
P144.27°
 1394179
Cut to centerpoint.
P444.01°
10305070
Meet P2, P3
P243.50°
 2384278
Meet at culet.

Crown

#AngleFacetsNotes
C246.42°
 8324872
Level girdle.
C340.39°
12285268
Level girdle.
C139.34°
 1394179
Set girdle width.
C539.29°
 9314971
Meet G2, G3, C2, C3
C731.76°
8040
Meet C1, C2, C5, C6
C427.73°
2060
Level girdle.
C618.00°
 4364476
Meet C1, C2, C5; C3, C4, C5
T0.00°
20
Meet C4, C6