Trillion Asscher

by Arya Akhavan (March 2014)
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Gemology Projectopen
L/W
109%
Design RI
1.58
H/W
55%
Gear
96
V/W³
0.175
Symmetry
3 (mirrored)
Facets
67
Tiers
17
Crown
25
Pavilion
42

This design was written for Jordan Wilkins, for a specific piece of tourmaline rough that a client wanted cut in a trillion. As much as I dislike step cuts, I have to say, this one actually looks pretty damn good. I'm surprised. Works in materials from beryl to rutile (RI = 1.58 - 2.62) with no changes, but gets crazy in higher RIs. Suggested size = 6-12 mm

Wireframe

Trillion Asscher 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
164880
Set stone size.
G290.00°
131945517783
Level girdle.
G390.00°
963264
Level girdle.
P546.80°
164880
Establish step to 2/3 culet-to-girdle distance.
P645.01°
131945517783
Meet P3, P4, P5
P344.80°
164880
Establish step to 1/3 culet-to-girdle distance.
P743.85°
963264
Meet P4, P6
P443.01°
131945517783
Meet P1, P2, P3
P142.78°
164880
Cut to centerpoint.
P241.00°
131945517783
Meet at culet.

Crown

#AngleFacetsNotes
C130.00°
164880
Set girdle width.
C228.47°
131945517783
Level girdle.
C425.72°
164880
Establish step to 1/4 culet-to-girdle distance.
C325.03°
963264
Level girdle.
C524.35°
131945517783
Meet C1, C2, C4
C622.91°
963264
Meet C2, C3, C5
T0.00°
24
Meet C5, C6