Faceting Design Diagram: Double Cross Square – Zircon – Hyacinth, Starlite


Zircon (Hyacinth, Starlite)

Double Cross Square (ZIRCON6.JRG)
By Jeff R. Graham
Copyright 1993
88.8% Light Return
Angles for R.I. = 1.93
101 facets + 8 facets on girdle = 109
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.505 T/L = 0.505
P/W = 0.448 C/W = 0.201
H/W = (P+C)/W+0.02 = 0.669
P/H = 0.670 C/H = 0.300
Vol./W^3 = 0.286

Addition # 2 – This design is not as hard to cut as it might look, it is all cut to center point except for the 2 step cuts. However, this design is not for a new cutter, unless you just want to try it, 1-18cts. Cut in refractive indexes 1.76 to 2.14 with no changes.


Random – Cosine – ISO

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.