Speed Spike: Faceting Design Diagram

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

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

PAVILION

CROWN

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.

Detailed faceting instructions by Jeff Graham available at The Rock Peddler