Sp Dirk: Faceting Design Diagram
Successful tips, details and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Sp Dirk"
Zircon (Hyacinth, Starlite)
Sp Dirk (MC58.JRG)
By Jeff R. Graham
79.6% Light Return
Angles for R.I. = 1.93
31 facets + 6 facets on girdle = 37
3-fold, mirror-image symmetry
L/W = 1.155 T/W = 0.481 T/L = 0.417
P/W = 0.518 C/W = 0.169
H/W = (P+C)/W+0.02 = 0.706
P/H = 0.733 C/H = 0.239
Vol./W^3 = 0.221
Addition # 7 - Cut in refractive indexes 1.76 to 2.20 with no changes. This is designed for light material with a high refractive index like Zircon. There are not a lot of facets on this design, but the sparkle is quite good. This design is good for accent stones that are on the small side, although it also works well in a large stone.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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