G&G 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.

• Source: Paul W. Millsteed et al., “Inclusions in Transparent Gem Rhodonite from Broken Hill, New South Wales, Australia,” Fall 2005, pp. 246–254.
  Additional Figures (10/18/05)
  Submitted by Paul W. Millsteed (paulmillsteed@hotmail.com)

• Source: Shane F. McClure et al., "Gem News International: Tenebrescent scapolite from Afghanistan," Fall 2005, pp. 269–271.
  Video Showing Tenebrescence in Scapolite from Afghanistan (10/18/05)
  Connection Speed: [Low 56k] [Med 100k] [Hi 256k]
  Submitted by Brendan M. Laurs (blaurs@gia.edu)
  
  Note: You will need to have the free QuickTime player installed on your computer to view this video clip. To download QuickTime, click here.

• Source: J.C. Zwaan et al., "Emeralds from the Kafubu Area, Zambia," Summer 2005, pp. 116–148.
  TABLE 1: Local geological terminology for the Kafubu emerald area (8/18/05)
  TABLE 2: Chemical composition of Zambian emeralds by electron microprobe (8/18/05)
  FIGURE: Fluid inclusions in Zambian emerald containing CO₂ and CH₄ (8/18/05)
  Submitted by Brendan M. Laurs (blaurs@gia.edu)

• 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 that were studied (10/07/04)
  Submitted by Barak Green (barak.green@gia.edu)

• 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 (blaurs@gia.edu)

• 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 (tom.overton@gia.edu)

• 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 (balvlad@iem.ac.ru)

• Source: Thomas W. Overton, "Gem News International: Update on Proprietary Diamond Cuts," Spring 2004, pp. 75–76.
  Table of Proprietary/Patented Diamond Cuts (last updated April 2005)
  Submitted by Thomas W. Overton (tom.overton@gia.edu)

• Source: Brendan M. Laurs et al., "Pezzottaite from Ambatovita, Madagascar: A New Gem Mineral," Winter 2003, pp. 268–283.
  TABLE 1: Electron-microprobe analyses of pezzottaite done at the University of New Orleans (1/20/04)
  TABLE 2: Mn, Fe, and Ti abundances in pezzottaite and red and pink beryls (1/20/04)
  SPECTRA: IR absorption, Raman, and X-ray diffraction (1/20/04)
  Submitted by: Brendan M. Laurs (blaurs@gia.edu)

• Source: Thomas M. Moses and James E. Shigley, "G. Robert Crowningshield: A Legendary Gemologist," Fall 2003, pp. 184–199.
  Presentations at AGS Conclaves by G. Robert Crowningshield (10/30/03)
  Submitted by: Thomas M. Moses and James E. Shigley (jshigley@gia.edu)

• Source: John L. Emmett et al., “Beryllium Diffusion of Ruby and Sapphire,” Summer 2003, pp. 84–135.
  TABLE 1. Samples used for gemological characterization in the Be-diffused corundum study (07/30/03)
  TABLE 2. Trace-element compositions of Be-diffused and natural-color corundum determined using SIMS (ppma) (07/30/03)
  TABLE 3. Durability and stability of the treatment in Be lattice diffusion–treated orange to pinkish-orange sapphires (07/30/03)
  Tables 1 and 2 submitted by: Wuyi Wang (wuyi.wang@gia.edu)
  Table 3 submitted by: Robert E. Kane (finegemsintl@msn.com)
  
  Supplementary bibliography on corundum diffusion (07/30/03)
  Prepared by Gems & Gemology staff

• Source: B. A. Kjarsgaard and A. A. Levinson, "Diamonds in Canada," Summer 2002, pp. 208-238.
  Discredited, Unsubstantiated, and Doubtful Reports of Diamond Discoveries in Canada Before 1963 (10/30/02)
  Submitted by: B. A. Kjarsgaard and A. A. Levinson (levinson@geo.ucalgary.ca)

• Source: Dona Dirlam et al., "Liddicoatite-Elbaite Tourmaline from Anjanabonoina, Madagascar," Spring 2002, pp. 28-53.
  Electron-Microprobe Analyses of Liddicoatite-Elbaite (05/17/02)
  TABLE 1. Samples from Madagascar.
  TABLE 2. Samples from localities other than Madagascar.
  Submitted by: B. Laurs (blaurs@gia.edu)
  Notes: These tables provide all of the chemical data on liddicoatite-elbaite tourmaline that were obtained for this article. The references cited in the table are listed in the reference list of the original article.

• Source: James E. Shigley et al., "Gem Localities of the 1990s," Winter 2000, pp. 292-335.
  Pearl localities table - Expanded version (01/29/01)
  Submitted by: D. Dirlam (ddirlam@gia.edu)