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