Faceting Design Diagram: BP Star – Peridot – Olivine, Green, apple green to yellow green


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

BP Star (PDOT6.JRG)
By Jeff R. Graham
Copyright 1995
83.6% Light Return
Angles for R.I. = 1.67
56 facets + 10 facets on girdle = 66
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.570 T/L = 0.542
P/W = 0.449 C/W = 0.190
H/W = (P+C)/W+0.02 = 0.659
P/H = 0.681 C/H = 0.289
Vol./W^3 = 0.248

Addition # 3 – The C3 facets can be cut before the C2’s if you want to, otherwise this design cuts normally and you should not have any problems. It makes a very nice stone in any material, 1-8cts. Cut in refractive indexes 1.67 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.