The quarterly journal of the gemological institute of america
EDITORIAL
The Science of Phenomenal Gems, a Summary of Pegmatites, and a Cutter’s Remarkable Journey
Duncan Pay, Editor-in-Chief
An overview of the Summer 2025 Gems & Gemology content.
Articles (3)
Gem Granitic Pegmatites
Describes the geology, mineralogy, and formation of granitic-composition pegmatites and provides a summary of their worldwide occurrences.
Structures Behind the Spectacle: A Review of Optical Effects in Phenomenal Gemstones and Their Underlying Nanotextures
Provides a comprehensive summary of the special optical effects in gemstones, including opalescence, chatoyancy, asterism, schiller, and iridescence, and investigates the submicron inclusions and nanotextures in each type of phenomenal stone.
Ben Kho: From Rough Beginnings to Brilliant Mastery
Profiles the extraordinary life and work of Ben Kho, from a young entrepreneur in Cambodia to an award-winning gem cutter.
Regular Features
GEM NEWS INTERNATIONAL
Global coverage of gem sources, notable new gem materials, and recent industry developments.
COLORED STONES UNEARTHED
Explores the geological concepts related to colored stone formation.
Special Features
IN the SPOTLIGHT
Profiles the extraordinary life and work of Ben Kho, from a young entrepreneur in Cambodia to an award-winning gem cutter.
THE DR. EDWARD J. GÜBELIN
Most Valuable Article Awards
Laboratory-Grown Diamonds: An Update on Identification and Products Evaluated at GIA
Sally Eaton-Magaña, Matthew F. Hardman, and Shoko Odake
Observations of Oval-, Pear-, and Marquise-Shaped Diamonds: Implications for Fancy Cut Grading
Ilene M. Reinitz, Al Gilbertson, Troy Blodgett, Amanda Hawkes, James Conant, and Abhijith Prabhu
Chemical Analysis in the Gemological Laboratory: XRF and LA-ICP-MS
Ziyin Sun, Michael Jollands, and Aaron C. Palke
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