Faceting Design Diagram: Mars Dome – Danburite – Clear, Yellow, Pink


Danburite (Clear, Yellow, Pink)

Mars Dome (CHECK8.JRG)
By Jeff R. Graham
Copyright 2001
85.7% Light Return
Angles for R.I. = 1.63
53 facets + 8 facets on girdle = 61
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.161 T/L = 0.161
P/W = 0.405 C/W = 0.279
H/W = (P+C)/W+0.02 = 0.704
P/H = 0.576 C/H = 0.396
Vol./W^3 = 0.244

Addition # 6 – Cut in refractive indexes 1.62 to 1.93 (86.4%) with no changes. I designed this for Danburite, which is usually very pale. This design will help with dispersion and improve color…

 


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.