European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 37, issue 1
Articles | Volume 37, issue 1
https://doi.org/10.5194/ejm-37-53-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-37-53-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 37, issue 1
Research article
 | 
07 Feb 2025
Research article |  | 07 Feb 2025

Fingerprinting of ruby and sapphire gemstones through Fourier-transform infrared (FTIR) methodologies

António Soares de Sousa, Elsa Maria Carvalho Gomes, Laura Bayés-García, Alessandra Di Mariano, and Maite Garcia-Valles

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Short summary
In this work, we used Fourier-transform infrared (FTIR) spectroscopy to analyse 25 rubies and sapphires, including natural, synthetic, and treated specimens. By optimising sample positioning, we identified distinct spectral fingerprints for each type and treatment. This systematic approach enhances gemstone identification accuracy and contributes valuable data to existing gemological databases, enabling faster and more reliable analyses in the future.
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