Faceting Design Diagram: Purdy Girdle – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


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

Purdy Girdle Jeff Graham Facet Design1 Purdy Girdle Jeff Graham Facet Design2

Purdy Girdle (BEAD36.JRG)
By Jeff R. Graham
Copyright 200
Angles for R.I. = 1.54
160 facets + 16 facets on girdle = 176
16-fold, mirror-image symmetry
96 index
L/W = 1.000
P/W = 0.688 C/W = 0.688
H/W = (P+C)/W+0.02 = 1.396
P/H = 0.493 C/H = 0.493
Vol./W^3 = 0.523

 

Addition # 14 Note that this design has a girdle for setting the stone. It can be left off and the bead drilled. This works well in light to medium saturated materials.

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.