Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Old Style 2 (TLINE63.JRG)
By Jeff R. Graham
Copyright 1998
86% Light Return
Angles for R.I. = 1.62
73 facets + 8 facets on girdle = 81
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.458 T/L = 0.458
P/W = 0.417 C/W = 0.166
H/W = (P+C)/W+0.02 = 0.603
P/H = 0.692 C/H = 0.275
Vol./W^3 = 0.202

Addition # 2 - The crown on this design can be hard to cut. The C5,C6 tiers are close and can be tough to get right. The P5 tier is not center point, cut it until the P4 are just tapered, any material, 1-18cts. Cut in refractive indexes 1.62 to 1.76 with no changes.

 

 

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