Four Arrows: Faceting Design Diagram
Detailed information and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Four Arrows"0
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Four Arrows (MC81.JRG)
By Jeff R. Graham
91.8% Light Return
Angles for R.I. = 1.62
49 facets + 8 facets on girdle = 57
4-fold, mirror-image symmetry
L/W = 1.000 T/W = 0.244 T/L = 0.244
P/W = 0.445 C/W = 0.203
H/W = (P+C)/W+0.02 = 0.668
P/H = 0.666 C/H = 0.304
Vol./W^3 = 0.260
Addition # 7 - This is nice in about any material, I often use it for cutting dark stones. Cut in refractive indexes 1.62 to 2.14 with no changes. This makes good earrings, easy to set and are low profile so they wear well.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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