Faceting Design Diagram: P-Eight – Peridot – Olivine, Green, apple green to yellow green


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

P-Eight (PDOT5.JRG)
By Jeff R. Graham
Copyright 1994
87.1% Light Return
Angles for R.I. = 1.67
57 facets + 8 facets on girdle = 65
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.487 T/L = 0.487
P/W = 0.397 C/W = 0.161
H/W = (P+C)/W+0.02 = 0.578
P/H = 0.687 C/H = 0.279
Vol./W^3 = 0.186

Addition # 2 – For when you feel like cutting a round but do not want to cut a standard round brilliant . This design makes a nice change of pace and has a nice light return. Light to medium material, 1-6cts. Cut in refractive indexes 1.67 to 2.14 (87.9%) with no changes.

 


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler