Faceting Design Diagram: Brilliant Pear Checker – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Brilliant Pear Checker (CHECK28.JRG)
By Jeff R. Graham
Copyright 2001
80.6% Light Return
Angles for R.I. = 1.62
58 facets + 13 facets on girdle = 71
1-fold, mirror-image symmetry
96 index
L/W = 1.207 T/W = 0.281 T/L = 0.233
P/W = 0.451 C/W = 0.217
H/W = (P+C)/W+0.02 = 0.688
P/H = 0.655 C/H = 0.316
Vol./W^3 = 0.245

Addition # 6 – This is not hard, especially if you have cut my “Brilliant Pear” design(s) first. However, it can be a little tricky to cut the crown in. This works in refractive indexes 1.62 to 1.93 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.