“Streeeech”: Faceting Design Diagram
Successful tips, details and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Streech"
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
"Streeeech" (TLINE62.JRG)
By Jeff R. Graham
Copyright 1998
72% Light Return
Angles for R.I. = 1.62
31 facets + 4 facets on girdle = 35
2-fold, mirror-image symmetry
96 index
L/W = 4.000 T/W = 3.491 T/L = 0.873
P/W = 0.602 C/W = 0.229
H/W = (P+C)/W+0.02 = 0.851
P/H = 0.707 C/H = 0.269
Vol./W^3 = 1.972
Addition # 2 - This works best on open "c" axis Tourmaline. A preform is needed 4.0 L/W. The crown can be cut as low as 32 degrees (10 degrees off of all the crown tiers), 2-18cts.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
