Immunoglobulin M

by Arya Akhavan (January 2013)
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Gemology Projectopen
L/W
105%
Design RI
1.73
H/W
66%
Gear
120
V/W³
0.203
Symmetry
5 (mirrored)
Facets
76
Tiers
12
Crown
36
Pavilion
20

Immunology: where every structure can be likened to be something either sexual or hilarious. This particular pattern was modelled after the pentagonal-Y structure of immunoglobulin M (IgM), which I forgot about on my exam. Works in m-aterials from quartz to rutile (RI = 1.54 - 2.62) with no changes, but I prefer it in rhodolite. Suggested size = 8-12 mm

Wireframe

Immunoglobulin M 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
 12 36 60 84108
Set stone size.
G290.00°
 11 13 35 37 59 61 83 85107109
Level girdle.
G390.00°
120 24 48 72 96
Level girdle.
P144.78°
 12 36 60 84108
Cut to centerpoint.
P344.29°
 11 13 35 37 59 61 83 85107109
Meet at culet.
P242.50°
120 24 48 72 96
Meet at culet.

Crown

#AngleFacetsNotes
C329.04°
120 24 48 72 96
Level girdle.
C125.00°
 12 36 60 84108
Set girdle width.
C224.97°
 11 13 35 37 59 61 83 85107109
Level girdle.
C512.91°
  1 23 25 47 49 71 73 95 97119
Meet C1, C2, C4
C412.90°
120 24 48 72 96
Meet C2, C3
T0.00°
 30
Meet C4, C5