Board Exam

by Arya Akhavan (July 2014)
Save to collection
No ratings yet
Gemology Projectopen
L/W
105%
Design RI
1.54
H/W
73%
Gear
120
V/W³
0.256
Symmetry
20 (mirrored)
Facets
241
Tiers
19
Crown
141
Pavilion
100

To write this design, I took my score on the USMLE Step 1 and used that as the goal for number of facets. P6 should be frosted in RIs lower than 1.61, because it'll window otherwise. In higher RIs, the star in the bottom becomes "framed" by a ring of extra brightness and a backdrop of extinction, and that looks cool! Works in materials from quartz to CZ (RI = 1.54 - 2.16) with no changes, but it's intended for large blue topaz.

Wireframe

Board Exam 3D view
Top viewSide viewFront viewBack view

Pavilion

#AngleFacetsNotes
G190.00°
 12 36 60 84108
Set stone size.
G290.00°
120 24 48 72 96
Level girdle.
P267.53°
 12 36 60 84108
Level girdle.
P146.32°
120  6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96102108114
Cut to centerpoint.
P344.32°
  3  9 15 21 27 33 39 45 51 57 63 69 75 81 87 93 99105111117
Cut P3(003) to meet P1, P2.
P442.32°
120  6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96102108114
Meet P1, P3
P540.83°
  3  9 15 21 27 33 39 45 51 57 63 69 75 81 87 93 99105111117
Meet P3, P4
P638.99°
120 24 48 72 96
Meet P4, P5 (leave frosted)

Crown

#AngleFacetsNotes
C160.10°
 12 36 60 84108
Set girdle width.
C237.39°
120 24 48 72 96
Level girdle.
C335.09°
  6 12 18 30 36 42 54 60 66 78 84 90102108114
Cut C1(006) to meet G1, G2, C1, C2
C434.30°
  5 19 29 43 53 67 77 91101115
Meet G1, G2, C1, C2, C3
C632.51°
120 24 48 72 96
Meet C2, C4, C5
C530.52°
  3  9 15 21 27 33 39 45 51 57 63 69 75 81 87 93 99105111117
Meet C1, C3
C727.04°
120  6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96102108114
Meet C3, C5; C3, C4, C5; C5, C6
C824.53°
  3  9 15 21 27 33 39 45 51 57 63 69 75 81 87 93 99105111117
Meet C5, C7
C922.89°
120  6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96102108114
Meet C7, C8
C1021.28°
  3  9 15 21 27 33 39 45 51 57 63 69 75 81 87 93 99105111117
Meet C8, C9
T0.00°
 30
Meet C9, C10