The quarterly journal of the gemological institute of america
EDITORIAL
Heated Corundum, the Remarkable Winston Red, and an Extraordinary Renaissance Jewel
Duncan Pay, Editor-in-Chief
An overview of the Spring 2025 Gems & Gemology content.
Articles (4)
The 3309 Cm⁻¹ Series in Sapphire and Ruby: A Focus on FTIR Peak Position Variation
Investigates the correlations between peak positions in the 3309 cm series with trace element concentrations for ruby, metamorphic and basalt-related blue sapphire, and laboratory-grown sapphire.
A Study of the Winston Red: The Smithsonian’S New Fancy Red Diamond
Presents the first scientific and historical study conducted on the 2.33 ct Winston Red, the fifth-largest known Fancy red diamond in existence.
Emeralds in Catherine De’ Medici’S Pendant: An Unexpected Geographic Origin
Archival research and gemological characterization reveal the geographic origin of two emeralds set in a pendant linked to Catherine de’ Medici, Queen of France from 1547 to 1559.
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
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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