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http://www.ganoksin.com/orchid/archive/9910/msg00203.htm
AUSTRALIAN FACETORS' GUILD http://cwpp.slq.qld.gov.au/afg/
Queensland Faceting Guild http://www.ozbird.com/qfg.htm
Canadian
Rockhound
http://www.canadianrockhound.com/2000/01/cr0004115_centennial_cut.html
About
Fred Van Sant by Charlie Moon
http://www.usfacetersguild.org/articles/tribute/fred_vansant.shtml
Gemcad for Windows
http://www.gemcad.com/
Bob Keller's
great site http://rockhounds.com/rockshop/gem_designs/
http://www.rockhounds.com/rockshop/gem_designs/design_index.shtml
Tangent
Ratio Converter
http://www.rockhounds.com/rockshop/gem_designs/tangent_ratio_form.html
Diamond weight
estimate formula.html
http://www.dendritics.com
Gem Weight
Calc http://www.dendritics.com/scales/carat-weight.asp