Faceting 101 - Exam 1

SRB Deluxe
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Gemology Projectopen
L/W
100%
Design RI
1.58
H/W
62%
Gear
96
V/W³
0.204
Symmetry
2 (mirrored)
Facets
145
Tiers
11
Crown
65
Pavilion
56

by Arya Akhavan (October 2012)

Your first exam is a modification of the Standard Round Brilliant that uses most of the modifications used to scale the design up for larger stones. This exam tests cutting to a centerpoint, cutting an equal level girdle, cutting multiple facets to and from the same meet, and cutting more than 100 facets. Exam rules: cut in golden beryl, with W = 10 mm (+/- 0.5 mm) and G = 0.3 mm (+/- 0.1 mm)

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Faceting 101 - Exam 1 3D view
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Pavilion

#AngleFacetsNotes
G190.00°
 2 610141822263034384246505458626670747882869094
Set stone size.
P145.08°
 618304254667890
Cut to centerpoint. (Use all G1 indices.)
P244.01°
 2101422263438465058627074828694
Overwrite some P1 facets (level girdle)
P343.06°
 1111323253537474959617173838595
Meet G1, P2
P442.06°
 2101422263438465058627074828694
Meet P1, P2, P3

Crown

#AngleFacetsNotes
C234.44°
 618304254667890
Level girdle.
C132.79°
 2101422263438465058627074828694
Set girdle width.
C331.49°
 1111323253537474959617173838595
Meet G1, C1
C427.54°
 2101422263438465058627074828694
Meet C1, C2, C3
C523.39°
 618304254667890
Meet C1, C2, C3, C4
T0.00°
24
Meet C3, C4