Standard Round Brilliant with Step Framed Table
GemCad Derived Rendering by Bob Keller Bob Keller

SRB Variation - Mixed Cut with Step Framed Table
SRB Variation - Mixed Cut with Step Framed Table
Angles for R.I. = 1.54 65 facets + 16 facets on girdle = 81
8-fold, mirror-image symmetry 96 index
L/W = 1.000 T/W = 0.517 T/L = 0.517 P/W = 0.450 C/W = 0.113 H/W = (P+C)/W+0.02 = 0.584 P/H = 0.772 C/H = 0.194
Vol./W^3 = 0.189 Brightness at 0 degrees tilt for R.I. = 1.54
COS = 72.2% ISO = 75.9%
Pavilion
pb1 44.00 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 Cut to temporary center point
g 90.00 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 Cut to meet pb2
pm1 42.00 96-12-24-36-48-60-72-84 Cut to meet pb1,pb2
Crown
cb 34.00 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 Cut to meet g - level girdle
cm 28.00 96-12-24-36-48-60-72-84 Cut to meet cb,g
s 15.00 06-18-30-42-54-66-78-90 Cut to meet cb,cm
f 10.00 06-18-30-42-54-66-78-90 Cut to meet cb,cm
t 0.00 Table No meets!
This variation of the SRB adds a course of thin trapezoidal, step cut 'frame' facets between the table and the triangular shaped star facets. It is considered to be a mixed cut, combining both step and brilliant cut facets. Note that the table is not required to meet with the crown stars or mains when it is framed in this manner.


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