Faceting Design Diagram: Step Flower – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Step Flower (TLINE17.JRG)
By Jeff R. Graham
Copyright 1995
81.7% Light Return
Angles for R.I. = 1.62
85 facets + 6 facets on girdle = 91
6-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.526 T/L = 0.456
P/W = 0.452 C/W = 0.243
H/W = (P+C)/W+0.02 = 0.715
P/H = 0.633 C/H = 0.339
Vol./W^3 = 0.290

Addition # 1 – This design cuts fairly normal except for the step on the crown, which needs to be watched for size. It makes a nice stone in any material, I like it in light colors, 1-8cts. Cut in refractive indexes 1.62 to 1.93 (83.6%) with no changes.


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

Gram Faceting Archive of Information
This edited version of an article by the late Jeff Graham is part of a special archived informational series from Gram Faceting. Used with permission.