These charts are arranged with diamond at the star, followed by a listing by mineral type in alphabetical order. Four gemstone types with their weights represented in grams are listed last. Symbols following: N-Untreated; H-Heat Treated; I-Impregnation Treated or Fracture-Filled. These charts are meant to serve as a reference for determining relative value, and are not meant to be a price list. Confirm the three quality zones for each gemstone type when using these charts.
