Crystal Trig Glitter: Faceting Design Diagram

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

Crystal Trig Glitter (MC111.JRG)
By Jeff R. Graham
Copyright 2006
84% Light Return
Angles for R.I. = 1.62
76 facets + 6 facets on girdle = 82
3-fold, mirror-image symmetry
96 index
L/W = 1.073 T/W = 0.364 T/L = 0.339 P/W = 0.478
C/W = 0.246 H/W = (P+C)/W+0.02 = 0.744 P/H = 0.643 C/H = 0.330 Vol./W^3 = 0.277

PAVILION

CROWN

Addition # 12 - Cut in refractive indexes 1.62 to 2.14 with no changes. I designed this Trig variation for Aquamarine or any light to medium saturated material. This works in Quartz (41 degrees) although the performance is a little lower (74.8%). Note: C2 tier only meets the girdle at the corners, cutting the tier center point is the easiest way to have even facets.

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

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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