Faceting Design Diagram: Turning Wheel – Spinel – Red, Pink, Lavender, Green, Blue, Orange, Violet


Spinel (Red, Pink, Lavender, Green, Blue, Orange, Violet)

Turning Wheel (SPINEL2.JRG)
By Jeff R. Graham
Copyright 1995
83.6% Light Return
Angles for R.I. = 1.71
7 3 facets + 8 facets on girdle = 81
8-fold symmetry
96 index
L/W = 1.000 T/W = 0.513 T/L = 0.513
P/W = 0.415 C/W = 0.249
H/W = (P+C)/W+0.02 = 0.683
P/H = 0.607 C/H = 0.364
Vol./W^3 = 0.274

Addition # 2 – This design is easier than it looks. The facets on the pavilion line up in a spiral and are easy to see once you get started. Any material in a light to medium color works well, 1-12cts. Cut in refractive indexes 1.71 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.