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Long Opposed Bar II

Faceting design

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Jakes Schmidt
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154 views1 page

Long Opposed Bar II

Faceting design

Uploaded by

Jakes Schmidt
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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48

54 42

60 36

66 30

B 3
72 F E D C 24 T W 2 4
6

A 5
78 18
1

84 12

90 6
<96>
Long Opposed Bar II
Bruce White 9-6-2010
Copyright 2010
C U Angles for R.I. = 1.620
A 19 + 4 girdles = 23 facets
2-fold, mirror-image symmetry
5
P 96 index
6 L/W = 2.634 T/W = 0.800 U/W = 0.343
L P/W = 0.496 C/W = 0.274
Vol./W³ = 1.238

PAVILION
1 90.00° 96-48 Establish width
2 90.00° 24-72 Establish length
3 73.17° 24-72 Establish girdle line
4 57.05° 24-72 Cut approximatly equil to #3 width
5 48.15° 96-48 Cut to meet #3 at girdle
6 41.50° 96-48 Cut to culet and 3-4-5
CROWN
A 70.00° 96-48 Establish girdle width
B 22.00° 24-72 Establish girdle width
C 15.00° 24-72 Cut to leave B facet just over 10% of length
D 10.00° 24-72 Cut to leave C facet just over 10% of length
E 5.00° 24-72 Cut to leave D facet just over 10% of length
F 0.00° Table Cut to leave table same size as steps.

Simple design for long tourmaline crystals. Steep end facets for closed "C" axis tourmaline. Works well
with long pieces of mixed color sunstone to avoid mixing of colors. Crown facets B through F are cut by eye
and may require some fiddling to get proportions correct.
C:\Users\D\Desktop\GEMCAD~1\November\LONGOP~1.GEM

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