Seikyou

by Arya Akhavan (August 2012)
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Gemology Projectopen
L/W
140%
Design RI
1.61
H/W
88%
Gear
96
V/W³
0.570
Symmetry
2 (mirrored)
Facets
89
Tiers
18
Crown
39
Pavilion
50

Apparently, I'm awful at designing crowns, but somehow this turned out to be a success. It's got some amazing light return and very little tilt windowing, even though the pavilion is five times deeper than the crown. Be careful with the smaller crown facets (they go quickly) and the corners (8 facet meetpoint). Suggested size = 15-25 mm.

Wireframe

Seikyou 3D view
Top viewSide viewFront viewBack view

Pavilion

#AngleFacetsNotes
G190.00°
9648
Set stone width.
G290.00°
2472
Meet P1, G1
P272.34°
9648
Level girdle.
P356.54°
2472
Level girdle.
P140.57°
96 4 81217182325303136404448525660656671737879848892
Cut to centrepoint.
P439.57°
 2101422263438465058627074828694
Meet P1, P2 (only four facets meet)

Crown

#AngleFacetsNotes
C164.23°
9648
Set girdle width.
C236.28°
2472
Meet G1, G2, C1 (level girdle)
C319.05°
 3455193
Meet G1, G2, C1, C2 ("cluster")
C817.92°
 1474995
Meet C1, C3
C415.06°
17316579
Meet at cluster.
C514.86°
 6425490
Meet at cluster.
C614.34°
 7415589
Meet at cluster.
C1112.53°
9648
Meet C3, C5, C8, C10
C1011.39°
 3455193
Meet C3, C5, C8
C710.77°
21276975
Meet C2, C4
C98.57°
14346282
Meet C4, C6, C7
T0.00°
24
Meet C10, C11; C7, C9