Northern Lights

by Arya Akhavan (July 2013)
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Gemology Projectopen
L/W
100%
Design RI
1.62
H/W
63%
Gear
80
V/W³
0.219
Symmetry
4 (mirrored)
Facets
65
Tiers
12
Crown
33
Pavilion
20

For some reason, I really like crown designs with thin bars tracing an outline. For this particular design, I was looking at a bunch of compass roses on old maps, and tried to incorporate a bit of that feel into the crown. Works in materials from quartz to rutile (RI = 1.54 - 2.62) with no changes, best in heavily dichroic tourmaline. Suggested size = 8-15 mm

Wireframe

Northern Lights 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
 218223842586278
Set stone size.
G290.00°
10305070
Level girdle.
P244.69°
 218223842586278
Level girdle.
P142.69°
 119213941596179
Cut to centerpoint.
P341.50°
10305070
Meet P1, P2

Crown

#AngleFacetsNotes
C127.24°
 218223842586278
Set girdle width.
C426.17°
80204060
Meet G1, C1
C223.96°
10305070
Level girdle.
C323.17°
 416243644566476
Meet G1, G2, C1, C2
C522.15°
80204060
Meet C1, C3, C4
C617.65°
10305070
Meet C2, C3
T0.00°
20
Meet C3, C5, C6