Home Rough 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 Synthetics Topaz Tourmaline Quartz Zircon

Bargains Beginner's Page Eclectic New Stuff Odds & Ends Parcels Specials
Cut Gemstones Cutting Information Pricing Guides Buying Gemstones

Garnet (Pyrope, Rhodolite, Almandine, Spessartite, Grossular, Demantoid, Tsavorite)

8-Swirl (GNETA1.JRG)
By Jeff R. Graham
Copyright 1993
90.9% Light Return
Angles for R.I. = 1.78
57 facets + 8 facets on girdle = 65
8-fold symmetry
96 index
L/W = 1.000 T/W = 0.403 T/L = 0.403
P/W = 0.375 C/W = 0.141
H/W = (P+C)/W+0.02 = 0.536
P/H = 0.699 C/H = 0.263
Vol./W^3 = 0.198

Gram Book 1 - A nice design for colored Garnet (notice the 1.78 R.I). It is a little different to cut. The facets cut fast, watch out. I prefer this design in a light Garnet like a Mali. Cut in refractive index 1.78 to 2.14 (92.6%) with no changes.

 

 



Random - Cosine - ISO

Return to OnLine Design Index

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


Copyright 1998-2009 Gram Faceting - All Rights Reserved.