Faceting Design Diagram: Cross-Point – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


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

Cross-Point (QTZ38.JRG) Amethyst cut by Tony Carson
By Jeff R. Graham
Copyright 1994
70.7% Light Return
Angles for R.I. = 1.54
49 facets + 8 facets on girdle = 57
4-fold, mirror-image symmetry 96 index
L/W = 1.000 T/W = 0.468 T/L = 0.468
P/W = 0.445 C/W = 0.212
H/W = (P+C)/W+0.02 = 0.677
P/H = 0.657 C/H = 0.313
Vol./W^3 = 0.246

Gram Book 1 – This design cuts fast and easy, watch the symmetry change on the crown, especially. I like this stone in saturated orange (Citrine) or purple (Amethyst) quartz, 1-24cts. This works very well in 3-5cts and I often match cut sets for earrings. Cut in refractive index 1.54 to 2.14 (87.7%) 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.