Gemology Tools Professional Version 9.3 – Download only available.  Windows Only 

Gemstone Quick Reference, Diamond and Colored Stone Weight Estimations, Round Diamond Grading (NAJA grading system), Akoya Pearl Strand Grading, Round Diamond Proportion Analyzer, Crown Angle Calculator, Weight Charts and more. New features include more that 100 photomicrographs of inclusions in diamonds and colored stones and the Gemstone Separator. As you add information about the gem, the separator narrows the list of possibilities.