Old Faithful gem designOld Faithful gem design

Old Faithful: Faceting Design Diagram

Tips, details, and a guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Old Faithful".


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

Old Faithful gem design

Old Faithful (TLINE59.JRG)
By Jeff R. Graham
Copyright 1998
84% Light Return
Angles for R.I. = 1.62
57 facets + 16 facets on girdle = 73
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.454 T/L = 0.454
P/W = 0.431 C/W = 0.185
H/W = (P+C)/W+0.02 = 0.636
P/H = 0.678 C/H = 0.291
Vol./W^3 = 0.207

Addition # 2 - This is still about one of the best cuts there is as far as I am concerned. Cut in refractive indexes 1.62 to 2.14 (92.2%) with no changes.

Random - Cosine - ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

Jeff R. Graham

The late Jeff Graham was a prolific faceter, creator of many original faceting designs, and the author of several highly-regarded instructional faceting books such as Gram Faceting Designs.

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