Cutting Instructions
I attempt to accurately represent and describe cut stones and rough
as to appearance, size, origin and fully disclose any known
treatments in its description. Because you view the images on a
different monitor with different settings, color is particularly fickle
to represent, but I do my best.
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Twisted Step
By: Dan Starr
Cutting Instructions
Twisted Step - Designed by Dan Starr © 2007
Angles are for R.I = 1.54
61 Facets  +  10 Girdle Facets  =  71  Total Facets
10-fold radial symmetry
120  Index
L/W = 1.051  T/W = 0.531  U/W = 0.505  P/W = 0.450  C/W = 0.127
Volume/W e3  =  0.210
Cutting Remarks  -  Another 120 index design  These angles work without changes from R.I. of 1.54 to 2.17.  It looks best
at higher R.I.s.  This also has high tilt brightness.
Brightness Table
R.I.
Iso %
Cos %
1.54
88.0
82.5
1.62
88.4
81.5
1.76
89.3
79.8
1.96
89.1
78.4
2.17
92.4
79.4
Twisted Step cut in Umbalite Garnet
1.44 ct  - 6.65 mm x 4.2 mm
Pavilion
P1
46.00°
120-012-024-036-048-060-072-084-096-108
Cut to center point.                                                                                            
P2(G)
90.00°
120-012-024-036-048-060-072-084-096-108
Cut to meet P1.                                                                                                  
P3
42.00°
119-011-023-035-047-059-071-083-095-107
Cut to meet P2(G).                                                                                            
P4
41.00°
118-010-022-034-046-058-070-082-094-106  
Cut to meet P1.                                                                                                  
Crown
C1
33.00°
120-012-024-036-048-060-072-084-096-108
Cut to form girdle.                                                                                              
C2
27.00°
120-012-024-036-048-060-072-084-096-108
Cut a step about 20% of line length to center.                                                   
C3
21.00°
120-012-024-036-048-060-072-084-096-108
Cut a step about 30% of line length to center.                                                   
T
0°
Table                                                                   
Cut to make Table about 50% of width.