Faceting Design Diagram: Green Cross-Point – Peridot – Olivine, Green, apple green to yellow green


Peridot (Olivine, Green, apple green to yellow green)

Green Cross-Point (PDOT3.JRG) 1.94 carat yel/grn Tourmaline
By Jeff R. Graham
Copyright 1994
77.5% Light Return
Angles for R.I. = 1.67
37 facets + 4 facets on girdle = 41
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.541 T/L = 0.541
P/W = 0.438 C/W = 0.207
H/W = (P+C)/W+0.02 = 0.665
P/H = 0.659 C/H = 0.311
Vol./W^3 = 0.297

Addition # 3 – A simple square cut with a lot of flash, this design cuts fast and is easy. A nice stone for about anything you want to do with it. Light to medium material, 1/2-4cts. Cut in refractive indexes 1.67 to 1.76 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.