Faceting 101 - Lesson 5

Tricky Triangle
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Gemology Projectopen
L/W
115%
Design RI
1.73
H/W
65%
Gear
96
V/W³
0.224
Symmetry
3
Facets
30
Tiers
10
Crown
15
Pavilion
15

by Arya Akhavan (October 2012)

Lesson 5 is our first modern-style design, and it uses a triangle, NOT a trillion (there's no cushioning here). This lesson teaches how to use a CAM preform (non-retained CAM facets; X1, C2) to generate a girdle outline, how to cut radial symmetry instead of mirror symmetry, and how to cut an apex crown (C5). Lesson rules: cut in rhodolite garnet, with no size restrictions

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Faceting 101 - Lesson 5 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
963264
(from preform)
G290.00°
164880
(from preform)
P147.12°
164880
Cut to new centerpoint.
P245.11°
963264
Level girdle.
P342.64°
144678
Meet P1, P2

Crown

#AngleFacetsNotes
C152.50°
164880
Set girdle width.
C233.09°
963264
Level girdle.
C323.48°
 43668
Meet G1, G2, C1, C2
C419.33°
225486
Meet C1, C2, C3
C57.56°
134577
Meet C1, C3, C4