The quarterly journal of the gemological institute of america
EDITORIAL
Cause of Color in Yellow Sapphire, Plus Characterization of Oregon Sunstone, Ukrainian Beryl, and British Columbian Iolite
Duncan Pay, Editor-in-Chief
An overview of the Fall 2023 Gems & Gemology content.
Articles (4)
Yellow Sapphire: Natural, Heat-Treated, Beryllium-Diffused, and Synthetic
Investigates the various chromophores responsible for color in four types of yellow sapphire.
Special Colors and Optical Effects of Oregon Sunstone: Absorption, Scattering, Pleochroism, and Color Zoning
Details the colors and optical effects caused by metallic copper inclusions in this gem-quality feldspar.
Etch Pits in Heliodor and Green Beryl from the Volyn Pegmatites, Northwest Ukraine: A Diagnostic Feature
Examines dissolution features of heliodor and green beryl from a Ukrainian pegmatite field and offers criteria to distinguish them from samples found in other localities.
Iolite from the Thor-Odin Dome, British Columbia, Canada: Geology, Chemical Composition, Inclusions, and Cause of Chatoyancy
Reports on the geological setting and gemological properties of violet-blue gem cordierite from new deposits located in British Columbia.
Regular Features
GEM NEWS INTERNATIONAL
Global coverage of gem sources, notable new gem materials, and recent industry developments.
THE DR. EDWARD J. GÜBELIN
Most Valuable Article Awards
Methods and Challenges of Establishing the Geographic Origin of Diamonds
Evan M. Smith, Karen V. Smit, and Steven B. Shirey
A Canary in the Ruby Mine: Low-Temperature Heat Treatment Experiments on Burmese Ruby
E. Billie Hughes and Wim Vertriest
