the quarterly journal of the gemological institute of america
Fall 2023 - Volume 59, Issue 3
All Issuesthe quarterly journal of the gemological institute of america
![](jpg/fa23-gg-hero-313753-1280x650.jpg%3bfilename_%3dutf-8%27%27fa23-gg-hero-313753-1280x650.jpg)
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)
![Color](jpg/fa23-emmett-fig1-313159-216px.jpg%3bfilename_%3dutf-8%27%27fa23-emmett-fig1-313159-216px.jpg)
Yellow Sapphire: Natural, Heat-Treated, Beryllium-Diffused, and Synthetic
Investigates the various chromophores responsible for color in four types of yellow sapphire.
Read More![Optical Properties](jpg/fa23-jin-fig1-313071-216px.jpg%3bfilename_%3dutf-8%27%27fa23-jin-fig1-313071-216px.jpg)
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.
Read More![Mineralogy](jpg/fa23-franz-fig2a-216px.jpg%3bfilename_%3dutf-8%27%27fa23-franz-fig2a-216px.jpg)
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.
Read More![Geology](jpg/fa23-belley-fig12-313008-216px.jpg%3bfilename_%3dutf-8%27%27fa23-belley-fig12-313008-216px.jpg)
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.
Read MoreRegular Features
![Lab Notes](jpg/lab-notes-landing-page-300x169.jpg%3bfilename_%3dutf-8%27%27lab-notes-landing-page-300x169.jpg)
![Fall 2023 Micro-World Banner](jpg/fa23-mw-banner-312989-300px.jpg%3bfilename_%3dutf-8%27%27fa23-mw-banner-312989-300px.jpg)
![Gem News](jpg/gni-landing-page-300x169.jpg%3bfilename_%3dutf-8%27%27gni-landing-page-300x169.jpg)
Gem News International
Global coverage of gem sources, notable new gem materials, and recent industry developments.
View All (13)![Diamond Reflections](jpg/diamond-reflections-216x122.jpg%3bfilename_%3dutf-8%27%27diamond-reflections-216x122.jpg)
Most Valuable Article Awards
![MVA First Place](png/sp23-mva-1st-130x130.png%3bfilename_%3dutf-8%27%27sp23-mva-1st-130x130.png)
Methods and Challenges of Establishing the Geographic Origin of Diamonds
Evan M. Smith, Karen V. Smit, and Steven B. Shirey
![MVA Third Place](png/sp23-mva-3rd-130x130.png%3bfilename_%3dutf-8%27%27sp23-mva-3rd-130x130.png)
A Canary in the Ruby Mine: Low-Temperature Heat Treatment Experiments on Burmese Ruby
E. Billie Hughes and Wim Vertriest
![](png/gg-issues-icon.png)
the archive
past gems & gemology issues
You Might Also Like
![](https://www.gia.edu/images/resources-for-retailers.jpg)
Find a Retailer
learn more![](https://www.gia.edu/images/YMAL_Store-216x122.jpg)
Shop the Campus Store
Learn More![Abstract art with fluorescent rainbow and dark brown triangle patterns Abstract art with fluorescent rainbow and dark brown triangle patterns](https://www.gia.edu/images/diamond-abstract-art-266x162.jpg)
Subscribe to Knowledge Rocks Emails
Learn More![Diamond Origin Reports Diamond Origin Reports](https://www.gia.edu/images/GIA-diamond-origin-report-216x122.jpg)