Underneath the Sycamore

by Arya Akhavan (December 2012)
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Gemology Projectopen
L/W
104%
Design RI
1.65
H/W
76%
Gear
96
V/W³
0.274
Symmetry
3 (mirrored)
Facets
139
Tiers
21
Crown
61
Pavilion
78

I have a piece of peridot that's been sitting under my bed for the past year, and I've just been too lazy to write a design for it. Well, I finally wrote it out, but I'm not sure if my machine is accurate enough to cut this! Ah well... This works in materials from feldspar to rutile (RI = 1.52 - 2.62) with no changes. Suggested size = 8-12 mm

Wireframe

Underneath the Sycamore 3D view
Top viewSide viewFront viewBack view

Pavilion

#AngleFacetsNotes
G190.00°
141846507882
Set stone size.
G290.00°
122044527684
Meet P1, G1
G390.00°
102242547486
Meet P1, G2
G490.00°
 82440567288
Meet P1, G3
P566.69°
141846507882
Level girdle.
P466.51°
122044527684
Level girdle.
P365.96°
102242547486
Level girdle.
P265.00°
 82440567288
Meet P1, G4 (level girdle)
P143.50°
 2 610141822263034384246505458626670747882869094
Cut to centerpoint.
P642.00°
 42836606892
Meet P1, P2, P3

Crown

#AngleFacetsNotes
C145.00°
141846507882
Set girdle width.
C245.00°
122044527684
Level girdle.
C345.00°
102242547486
Level girdle.
C445.00°
 82440567288
Level girdle.
C542.72°
112143537585
Meet G2, G3, C2, CC3
C733.00°
131945517783
Meet C1, C2, C5
C632.65°
 13133636595
Meet C4, G4
C829.09°
151747497981
Meet C1, C7
C923.71°
 13133636595
Meet C5, C6, C7
C1022.00°
 82440567288
Meet C5, C6, C7, C9
T0.00°
24
Meet C9, C10