Faceting Design Diagram: Quark – Tourmaline, Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Jeff Graham Faceting Design Jeff Graham Faceting Design

Quark (MIR74.JRG)
By Jeff R. Graham
Copyright 2005
87% Light Return
Angles for R.I. = 1.62
37 facets + 16 facets on girdle = 53
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.245 T/L = 0.245 P/W = 0.434
C/W = 0.249 H/W = (P+C)/W+0.02 = 0.703 P/H = 0.618 C/H = 0.354 Vol./W^3 = 0.250

Addition # 10 – Cut in refractive indexes 1.62 to 1.76 with no changes. This is designed for lightly saturated materials. I designed it for some pastel Afghan Tourmaline. It cuts fairly easy and works in about any size. I prefer sizes over 6mm. Note: P5 is cut short and just floats, the tier is not critical. It is done that way to add some interest to the flash, it makes “V” reflections. You can cut it to center point if you wish.

Jeff Graham Faceting Design

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

About the author
Jeff R. Graham
The late Jeff Graham was a prolific faceter, creator of many original faceting designs, and the author of several highly-regarded instructional faceting books such as Gram Faceting Designs.
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