Faceting Design Diagram: Square Star – Spinel – Red, Pink, Lavender, Green, Blue, Orange, Violet


Spinel (Red, Pink, Lavender, Green, Blue, Orange, Violet)

Square Star (SPINEL4.JRG)
By Jeff R. Graham
Copyright 1997
81.1% Light Return
Angles for R.I. = 1.71
89 facets + 16 facets on girdle = 105
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.557 T/L = 0.557
P/W = 0.413 C/W = 0.161
H/W = (P+C)/W+0.02 = 0.594
P/H = 0.695 C/H = 0.271
Vol./W^3 = 0.209

Addition # 3 – The C2,C3 steps are really the same and can be cut at one time, but I think it’s easier to meet in two tiers. Easy to cut and works well in any nice color material 1-6cts. Cut in refractive indexes 1.71 to 2.14 (85.4%)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.