Faceting Design Diagram: Boom – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose

Quartz (Amethyst, Citrine, Ametrine, Smokey, Rose)

Boom (MIR4.JRG)
By Jeff R. Graham
Copyright 2004
86.9% Light Return
Angles for R.I. = 1.54
57 facets + 8 facets on girdle = 65
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.314 T/L = 0.314
P/W = 0.453 C/W = 0.275
H/W = (P+C)/W+0.02 = 0.748
P/H = 0.606 C/H = 0.367
Vol./W^3 = 0.310

Addition # 9 – This is a little tricky to cut the first time. Note: The P3(G) just cuts in until it looks right, no meet. Cut the C3 as evenly as you can and it only meets at the C2 corners. Once you have cut this right, it will be easy to cut the next time. The corners can and will vary a little. This is designed for lightly saturated rough and works well in refractive indexes 1.54 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.