Home Rough Bargains Equipment Books Online Designs Just Ask Jeff Order News List Contact Me Links
Amethyst Aquamarine Beryl Citrine Emerald Garnet Opal Peridot Sapphire Scapolite Spinel Sunstone Topaz Tourmaline Quartz Zircon
Beginner's Page New Stuff Odds & Ends Specials Parcels Synthetics
Cut Gemstones Gemological Information Gemstone Pricing Guides How to buy Gemstones

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

Hexed "T" (TLINE23.JRG)
By Jeff R. Graham
Copyright 1995
81.7% Light Return
Angles for R.I. = 1.62
61 facets + 10 facets on girdle = 71
2-fold, mirror-image symmetry
96 index
L/W = 1.203 T/W = 0.606 T/L = 0.503
P/W = 0.451 C/W = 0.218
H/W = (P+C)/W+0.02 = 0.689
P/H = 0.655 C/H = 0.316
Vol./W^3 = 0.348

Gram Book 1 - The P9(G) can be cut in after P4(G) if you want to. The P8,P10 facets only meet at the girdle, so it's important that you make sure that the girdle is level. Cut in any material, 1-12cts. This works well in Topaz, and Peridot.


 

 


Random - Cosine - ISO

Return to OnLine Design Index

Home Rough Bargains Equipment Books Online Designs Just Ask Jeff Order News List Contact Me Links


Copyright 1998-2007 Gram Faceting - All Rights Reserved.