Faceting Design Diagram: Trip’in – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Trip’in (CHECK70.JRG)
By Jeff R. Graham
Copyright 2003 84.3%
Light return Angles for R.I. = 1.62
39 facets + 4 facets on girdle = 43
2-fold, mirror-image symmetry
96 index
L/W = 1.303 T/W = 0.273 T/L = 0.209
P/W = 0.370 C/W = 0.222
H/W = (P+C)/W+0.02 = 0.612
P/H = 0.604 C/H = 0.363
Vol./W^3 = 0.194

Addition # 8 – This needs to be cut in a large stone and can be cut in another order. Notice that I cut the center first and go towards the edges. This is because there are no critical meets at 96-48 and these facets can absorb any slack that you might have. Also this can be cut in variable L/W, just let the outside facets absorb the difference by being larger or smaller. This can be cut in Quartz with no changes 81.2% to 2.14 (85.3%).


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.