Elser's Challenge

by Arya Akhavan (August 2012)
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Gemology Projectopen
L/W
204%
Design RI
1.62
H/W
64%
Gear
96
V/W³
0.493
Symmetry
2 (mirrored)
Facets
105
Tiers
31
Crown
53
Pavilion
52

Lisa was joking around with me about inability to use GemCAD, and issued a challenge of yield on this particular pink tourmaline. Hence, this pattern. Can be cut without changes from beryl to CZ (RI = 1.56 - 2.16). There's also a lot of flexibility in the pavilion and crown ratios, and good face-up/tilt brightness. Suggested width = 6-9 mm

Wireframe

Elser's Challenge 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
9648
Set stone width.
G290.00°
 3455193
Meet P1, P2, G1, P3
G390.00°
 5435391
Cut level girdle.
G490.00°
10385886
Meet P4, G3, P5
G590.00°
18306678
Cut level girdle.
G690.00°
2472
Cut level girdle.
P943.60°
9648
Level girdle.
P843.25°
2472
Meet P5, P6, P7
P742.88°
18306678
Meet P5, P6
P641.86°
10385886
Cut level girdle.
P441.35°
 5435391
Meet P1, P3
P240.95°
 1474995
Meet at centrepoint.
P340.91°
 3455193
Meet P1, P2, G1
P140.15°
 2465094
Cut to centrepoint.
P539.38°
 8405688
Meet P1, P3, P4

Crown

#AngleFacetsNotes
C129.39°
9648
Set girdle width.
C625.81°
2472
Level girdle.
C525.30°
18306678
Level girdle.
C323.75°
 5435391
Level girdle.
C423.75°
10385886
Level girdle.
C723.59°
 1474995
Meet G1, G2, C1, C2
C223.49°
 3455193
Level girdle.
C1123.12°
9648
Meet C1, C7
C823.01°
 2465094
Meet G1, G2, C1, C2, C7
C922.83°
 4445292
Meet G2, G3, C2, C3
C1021.65°
 8405688
Meet G3, G4, C3, C4; C4, C5, C6 ("cluster")
C1221.39°
 3455193
Meet C2, C8, C9; C7, C11
C1316.83°
 7415589
Meet C3, C9, C10; cluster
C1415.13°
 5435391
Meet C12, C13, C14; C7, C8, C11, C12
C155.90°
2472
Meet cluster
T0.00°
24
Meet C7, C8, C11, C12, C14; C13, C14, C15