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Crown

g1 90.00° 24-72 Establish width
g2 90.00° 96-48 Establish length
g3 90.00° 12-36-60-84 Cut by eye big enough for prong

Pavilion

1 37.50° 12-36-60-84 Establish girdle position. Cut to centerpoint.
2 37.50° 15-33-63-81 Meet 1, g1, g3
3 38.28° 09-39-57-87 Meet 1, g2, g3
4 43.41° 05-43-53-91 Meet 3, 1, g2 g3
5 42.06° 19-29-67-77 Meet 2, 1, g1, g3
6 45.81° 24-72 Meet 2, 5
7 48.94° 96-48 Meet 3, 4

Crown

a 31.11° 12-36-60-84 Establish girdle
b 24.60° 19-29-67-77 Cut to 1/4 width by eye
c 24.25° 05-43-53-91 Cut to 1/4 length by eye
d 12.12° 12-36-60-84 Meet c, a, b