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GIA has announced the release of the Spring 2025 edition of their quarterly journal Gems & Gemology (G&G). Spring 2025 G&G spotlights compelling gemological insights and historical discoveries to educate, inform, and inspire readers. In this issue, GIA scientists and colleagues from the Smithsonian Institution share the first scientific and historical study conducted on the Winston Red, the only Fancy red diamond on public exhibit. Other feature articles investigate the infrared peak position variation of sapphire and ruby and highlight the geographic origin of two emeralds set in a sixteenth-century pendant linked to Catherine de’ Medici, Queen of France.
This and every issue of G&G since 1934 are available at no cost on GIA’s website at GIA.edu/gems-gemology.
Feature articles include:
This and every issue of G&G since 1934 are available at no cost on GIA’s website at GIA.edu/gems-gemology.
Feature articles include:
- A Study of the Winston Red: The Smithsonian’s New Fancy Red Diamond Gabriela A. Farfan, Ulrika F.S. D’Haenens-Johansson, Stephanie Persaud, Eloïse Gaillou, Russel C. Feather II, W. Henry Towbin, and Daniel C. Jones Presents the first scientific and historical study conducted on the 2.33 ct Winston Red, the fifth-largest known Fancy red diamond in existence.
- The 3309 cm–1 Series in Sapphire and Ruby: A Focus on FTIR Peak Position Variation Wasura Soonthorntantikul and Aaron C. Palke Investigates the correlations between peak positions in the 3309 cm–1 series with trace element concentrations for ruby, metamorphic and basalt-related blue sapphire, and laboratory-grown sapphire.
- Emeralds in Catherine de’ Medici’s Pendant: An Unexpected Geographic Origin Gérard Panczer, Robin Fesquet, Lasha Moshi, Geoffray Riondet, Marie-Laure Cassius-Duranton, Lætitia Gilles-Guéry, Aurélien Delaunay, and Stefanos Karampelas 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.
- Lab Notes reports on CVD-grown gem diamonds from Plasmability, a rare gadolinite gemstone, irreversible photochromism in synthetic sapphire, and more.
- G&G Micro-World features eye-catching inclusions, such as aquamarine with fluorite inclusions, dendritic patterns in emerald, and snowflakes in opal.
- 2025 G&G Challenge, a multiple-choice quiz covering the feature articles in the four 2024 issues of G&G.
- Gem News International covers the 2025 Tucson gem show highlights, including Nigerian green beryl, a new deposit of pezzottaite from Madagascar, and the Gianmaria Buccellati Foundation Award.
