Faceting Design Diagram: Frosted Star – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


Quartz (Amethyst, Citrine, Ametrine, Smokey, Rose)

Frosted Star (QTZ12.JRG)
By Jeff R. Graham
Copyright 1993
60% Light Return
Angles for R.I. = 1.54
79 facets + 12 facets on girdle = 91
6-fold, mirror-image symmetry
96 index
L/W = 1.036 T/W = 0.533 T/L = 0.514
P/W = 0.459 C/W = 0.182
H/W = (P+C)/W+0.02 = 0.661
P/H = 0.694 C/H = 0.275
Vol./W^3 = 0.251

Gram Book 1 – This is a neat design for light to medium material and cuts well in about any size. I suggest that you leave P3 and C2 frosted (in light colored Quartz). I use a worn 320 grit, the ray trace is misleading, it has more reflection. When the facets are frosted, this has a flower-like effect. Cut in refractive index 1.54 to 1.93 (80.0%) with no changes. Note in 1.76 and higher the P1, P3 tiers are reflecting light, no need to frost them, if you do not want to. This is actually a pretty design and will help with light materials.

 


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.