|  | 
  
    | Tables, Charts and Graphs | 
  
    | Below you will find a listing
      of gemological reference material in the form of tables, charts
      and graphs. | 
  
    | Diamond
      Weight Estimation Tables
      Colored
      Gemstone Weight Estimation Tables
      Mohs Scale
      of Hardness | 
  
    |  | To start your career in gemology, please
      visit the International
      School of Gemology website. | 
  
    |  | Return
      to Home Page | 
  
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