Terrapin Carapace

by Arya Akhavan (August 2013)
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Gemology Projectopen
L/W
110%
Design RI
1.62
H/W
66%
Gear
96
V/W³
0.205
Symmetry
2 (mirrored)
Facets
65
Tiers
12
Crown
29
Pavilion
24

Originally, I was just experimenting to add more checkerboards to my Tessellation suite, but this particular design turned out much more turtle-like than I expected. It's got surprisingly good performance as well! Works in materials from quartz to CZ (RI = 1.54 - 2.16), but I prefer earthy tourmaline. May need optimizing for garnets. Suggested length = 8-15 mm

Wireframe

Terrapin Carapace 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
17316579
Set stone length.
G290.00°
 313354551618393
Level girdle.
P243.34°
 313354551618393
Meet at culet.
P143.24°
17316579
Cut to centerpoint.
P342.69°
15336381
Meet P1, P2, G1, G2
P442.42°
 412364452608492
Meet P2, G2; culet

Crown

#AngleFacetsNotes
C135.07°
 313354551618393
Set girdle width.
C233.00°
17316579
Level girdle.
C327.89°
 412364452608492
Meet G2, C1
C425.26°
14346282
Meet C1, C2, C3
C518.35°
 8405688
Meet C3, C4
T0.00°
24
Meet C4, C5