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Articles | Volume 16, issue 1
Articles | Volume 16, issue 1
https://doi.org/10.5194/se-16-81-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-16-81-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 16, issue 1
Research article
 | 
24 Jan 2025
Research article |  | 24 Jan 2025

Luminescence and a new approach for detecting heat treatment of geuda sapphire

Teerarat Pluthametwisute, Lutz Nasdala, Chutimun Chanmuang N., Manfred Wildner, Eugen Libowitzky, Gerald Giester, E. Gamini Zoysa, Chanenkant Jakkawanvibul, Waratchanok Suwanmanee, Tasnara Sripoonjan, Thanyaporn Tengchaisri, Bhuwadol Wanthanachaisaeng, and Chakkaphan Sutthirat

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Short summary
For decades, gemologists have struggled to detect heat-treated sapphire. High-technology instruments like Fourier-transform infrared (FTIR) spectrometers are costly. As a result, luminescence under shortwave ultraviolet (SWUV) light and longwave ultraviolet (LWUV) light provides a cheaper and more practical technique for identifying heat-treated sapphire. This work highlights that blue luminescence under SWUV light could indicate heated sapphire, whereas purplish-red may also be helpful.
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