Data Depository

This depository contains material that is supplementary to articles published in Gems & Gemology. Detailed descriptions of methods, extensive tabular material, and additional data or images may be submitted by authors and/or recommended by the editors for inclusion in the depository.

Important Note: Depository material has not undergone the full G&G review/revision process. Questions on depository items should be directed to the person who submitted the item.

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• Source: Thomas M. Moses et al., "A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds," Fall 2004, pp. 202–228.
  Acknowledgments (10/07/04)
  Table 1: Summary of Viewing Hemispheres Developed During Research of the Brightness Metric (10/07/04)
  Table 2: Summary of Brightness and Fire Metrics (10/07/04)
  Submitted by Barak Green

• Source: Brendan M. Laurs, William "Skip" Simmons, and Alexander Falster, "Gem News International: Gem Tourmaline from Congo," Fall 2004, pp. 263–265.
  Congo Tourmaline Analyses by Electron Microprobe
  Table 1: Slices
  Table 2: Crystals (Blue to Green)
  Submitted by Brendan M. Laurs

• Source: Thomas W. Overton, "Gem Treatment Disclosure and U.S. Law," Summer 2004, pp. 106–127.
  Appendix A: Excerpts from the FTC Guides
  Capsule Descriptions of Cited Cases
  U.S. State Laws Governing Deceptive Trade Practices and Gem Disclosure Obligations
  Submitted by Thomas W. Overton

• Source: Vladimir S. Balitsky et al., "The 3543 cm^-1 Infrared Absorption Band in Natural and Synthetic Amethyst and Its Value in Identification," Summer 2004, pp. 146–161.
  Table 1: Presence or Absence of the 3543 cm^-1 Absorption Band in Synthetic Quartz According to Growth Conditions
  Submitted by Vladimir S. Balitsky

• Source: "Gem News International: Update on Proprietary Diamond Cuts, Spring 2004, pp. 75–76.
  Table of Proprietary/Patented Diamond Cuts
  Submitted by Thomas W. Overton