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