Robert J. Williams, Ph.D.,G.G

The Basic Formulas are courtesy of Robert J. Williams, Ph.D.,G.G. ... Rockhound, Jewelry, Appraising, Retired appraiser of Antiques, Gemstones, and personal property, Author of program Gemstone, which covered over 650 minerals, and all gemstones... a compilation of formulas, data, and instructions for gemologist, mineralogist, and jewelers. Much of the basic data used in the Dendritics Automated Calculations page is courtesy of Bob Williams.