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Solid Earth
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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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Cited articles

Alombert-Goget, G., Li, H., Guyot, Y., Brenier, A., and Lebbou, K.: Luminescence and coloration of undoped and Ti-doped sapphire crystals grown by Czochralski technique, J. Lumin., 169, 516–519, https://doi.org/10.1016/j.jlumin.2015.02.001, 2016a. 
Alombert-Goget, G., Li, H., Faria, J., Labor, S., Guignier, D., and Lebbou, K.: Titanium distribution in Ti-sapphire single crystals grown by Czochralski and Verneuil technique, Opt. Mater., 51, 1–4, https://doi.org/10.1016/j.optmat.2015.11.016, 2016b. 
Andrade, L. H. C., Lima, S. M., Novatski, A., Neto, A. M., Bento, A. C., Baesso, M. L., Gandra, F. C. G., Guyot, Y., and Boulon, G.: Spectroscopic assignments of Ti3+ and Ti4+ in titanium-doped OH-free low silica calcium aluminosilicate glass and role of structural defects on the observed long lifetime and high fluorescence of Ti3+ ions, Phys. Rev. B, 78, 224202, https://doi.org/10.1103/PhysRevB.78.224202, 2008 
Beran, A. and Rossman, G. R.: OH in naturally occurring corundum, Eur. J. Mineral., 18, 441–447, https://doi.org/10.1127/0935-1221/2006/0018-0441, 2006. 
Cartier, L. E.: Ruby and sapphire from marosely, Madagascar, J. Gemmol., 31, 171–180, https://doi.org/10.15506/JoG.2009.31.5.171, 2009. 
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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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