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


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

 Jeff Graham Facet Design

 Jeff Graham Facet Design

Speed Spike (MIR56.JRG)
By Jeff R. Graham
Copyright 2005
85.3% Light Return
Angles for R.I. = 1.54
37 facets + 9 facets on girdle = 46
3-fold, mirror-image symmetry
96 index
L/W = 1.004 T/W = 0.290 T/L = 0.289 P/W = 0.398
C/W = 0.191 H/W = (P+C)/W+0.02 = 0.609 P/H = 0.654 C/H = 0.313 Vol./W^3 = 0.184

Addition # 10 – This cuts pretty easy and makes a nice stone. Cut in refractive indexes 1.54 to 2.14 with no changes. This design is ideal for 1 to 2 carat earrings in about any light to medium saturation.

Jeff Graham Facet Design

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.