Faceting 101 - Lesson 4

Teaching Trillion
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Gemology Projectopen
L/W
102%
Design RI
1.72
H/W
55%
Gear
96
V/W³
0.160
Symmetry
3 (mirrored)
Facets
46
Tiers
9
Crown
16
Pavilion
30

by Arya Akhavan (October 2012)

Our fourth lesson gets a bit more interesting - now we're cutting a trillion, or a brilliant triangular cushion. This lesson teaches how to cut multiple pavilion facets to the same centerpoint (P1, P2), and how to cut a girdle outline using multiple pavilion facets cut to the same centerpoint (a CAM outline; P1, P2). Lesson rules: cut in pyrope garnet, with no size restrictions

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Faceting 101 - Lesson 4 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
141846507882
Set stone size.
G290.00°
112143537585
Level girdle.
P144.04°
141846507882
Cut to centerpoint.
P342.50°
131945517783
Meet P1, P2, G1, G2
P242.00°
112143537585
Meet at culet.

Crown

#AngleFacetsNotes
C140.00°
141846507882
Set girdle width.
C234.19°
112143537585
Level girdle.
C323.28°
963264
Meet G2, C2
T0.00°
24
Meet C1, C2