Opposed Step 3.0: Faceting Design Diagram
Successful tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Opposed Step 3.0"
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Opposed Step 3.0 (MC9.JRG)
By Jeff R. Graham
Copyright 1999
91.2% Light Return
Angles for R.I. = 1.62
17 facets + 4 facets on girdle = 21
2-fold, mirror-image symmetry
96 index
L/W = 3.000 T/W = 0.873 T/L = 0.291
P/W = 0.501 C/W = 0.360
H/W = (P+C)/W+0.02 = 0.880
P/H = 0.569 C/H = 0.409
Vol./W^3 = 1.579
Addition # 4 - This L/W is not critical and may be changed without causing any problems. The crown can be raised if you have the rough or if you do not want to cut at 6 degrees. I use 6 degrees and it is not hard to cut, but CARE must be taken. This has great flash along the length. Cut this in R.I. 1.62 to 2.14 (87.9%) without changes.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
