Faceting 121 - Lesson 1C

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Gemology Projectopen
L/W
100%
Design RI
1.83
H/W
65%
Gear
96
V/W³
0.226
Symmetry
8 (mirrored)
Facets
77
Tiers
10
Crown
29
Pavilion
48

by Arya Akhavan (November 2012)

The third pattern in this lesson adds a "zircon star" to the pavilion, and quite a bit more complexity to the crown. In the finished stone, look at how the extinction pattern has been scattered and the total extinction decreased. Now, try rendering all three designs in amethyst, tanzanite, and YAG, and compare them all! Lesson rules: cut in purple YAG, trying to match colors with lesson 1A and 1B

Wireframe

Faceting 121 - Lesson 1C 3D view
Top viewSide viewFront viewBack view

Pavilion

#AngleFacetsNotes
G190.00°
9612243648607284
Set stone size.
P145.30°
9612243648607284
Cut to centerpoint.
P242.30°
 2101422263438465058627074828694
Meet P1, G1
P341.30°
 1111323253537474959617173838595
Meet P1, P2

Crown

#AngleFacetsNotes
C240.00°
12366084
Level girdle.
C336.63°
1113353759618385
Meet G1, C1, C2
C131.52°
96244872
Set girdle width.
C429.26°
 123254749717395
Meet G1, C1, C2, C3
C527.00°
96244872
Meet C1, C4; C3, C4
T0.00°
24
Meet C3, C4, C5