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.
Twist 16
By: Dan Starr
Cutting Instructions
Pavilion
P1
43.00°
03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93
Cut to center point.                                                                                    
P2(G)
90.00°
03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93
Cut to meet P1.                                                                                          
P3
41.50°
96-06-12-18-24-30-36-42-48-54-60-66-72-78-84-90
Cut to meet P2(G).                                                                                    
P4
39.80°
03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93
Cut to new center point and about half way to the girdle.                         
Crown
C1
38.00°
03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93
Cut to establish the girdle.                                                                          
C2
33.00°
02-14-26-38-50-62-74-86                                           
Cut to meet the girdle.                                                                                
C3
32.00°
09-21-33-45-57-69-81-93                                           
Cut to meet C1.                                                                                          
C4
29.20°
01-13-25-37-49-61-73-85                                           
Cut to meet C1.                                                                                          
C5
26.00°
09-21-33-45-57-69-81-93                                           
Cut to meet C2.                                                                                          
C6
24.00°
01-13-25-37-49-61-73-85                                           
Cut to meet C3.                                                                                          
T

Table                                                                           
Cut to meet C5.                                                                                          
Twist 16 - Designed by Dan Starr © 2007
Angles are for R.I = 1.62
105 Facets  +  16 Girdle Facets  =  121  Total Facets
8-fold radial symmetry
96  Index
L/W = 1.000  T/W = 0.519  U/W = 0.519  P/W = 0.428  C/W = 0.134
Volume/W e3  =  0.197
Cutting Remarks  -  The pavilion is easy to cut...it just takes time. The table meet points are easily adjusted using C5. This
makes a bright stone with lots of glitter.
Brightness Table
R.I.
Iso %
Cos %
1.54
X
X
1.62
92.8
87.2
1.76
93.5
87.1
1.96
93.0
84.4
2.17
92.4
81.0
Twist 16 cut in Nigerian Tourmaline
6.36 ct  - 12.2 x 7.3 mm
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Cutting Instructions
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