Faceting Design Diagram: Trig Glitter – Peridot


Peridot

Trig Glitter Jeff Graham Facet Design Trig Glitter Jeff Graham Facet Design

Trig Glitter (MC110.JRG)

By Jeff R. Graham
Copyright 2006
79.3% Light Return
Angles for R.I. = 1.67
88 facets + 6 facets on girdle = 94
3-fold, mirror-image symmetry
96 index
L/W = 1.073 T/W = 0.383 T/L = 0.357 P/W = 0.515
C/W = 0.246 H/W = (P+C)/W+0.02 = 0.781 P/H = 0.660 C/H = 0.315 Vol./W^3 = 0.292

Addition # 12 – Cut this in refractive index 1.67 to 2.14 with no changes. I designed this for Peridot or light colored Garnets. It is killer in any lightly saturated material and also works well in Zircons. Note: C2 only meets at the corners, cutting the tier to center point is the easiest way to make all the facets even.

Trig Glitter 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.