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


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

screamer Jeff Graham gemstone facet design

screamer Jeff Graham gemstone facet design

Screamer (MIR43.JRG)
By Jeff R. Graham
Copyright 2005

91.3% Light Return
Angles for R.I. = 1.54
32 facets + 8 facets on girdle = 40
8-fold, mirror-image symmetry
96 index
L/W = 1.000 P/W = 0.435 C/W = 0.278
H/W = (P+C)/W+0.02 = 0.732 P/H = 0.594 C/H = 0.379
Vol./W^3 = 0.235

 


screamer_facet_design_3

Random – Cosine – ISO

 

Addition # 10 – This works well in about any material, but it’s designed for lightly saturated materials. Cut in refractive indexes 1.54 to 1.73 with no changes. This is particularly nice in earrings and I like it in Tourmaline. A table can be cut on a large stone, leaving a C5 is a nice effect on smaller stones.

 

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.