Luminescence and a new approach for detecting heat treatment of geuda sapphire
<p>For decades, unraveling the heat treatment of sapphire has been a challenging issue. The present study offers new aspects that support the detection of heat treatment of sapphire. Natural geuda sapphire exhibits orange to red luminescence under longwave ultraviolet (LWUV; 365 nm) light, whi...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2025-01-01
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| Series: | Solid Earth |
| Online Access: | https://se.copernicus.org/articles/16/81/2025/se-16-81-2025.pdf |
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| author | T. Pluthametwisute T. Pluthametwisute L. Nasdala C. Chanmuang N. M. Wildner E. Libowitzky G. Giester E. G. Zoysa C. Jakkawanvibul W. Suwanmanee T. Sripoonjan T. Tengchaisri B. Wanthanachaisaeng C. Sutthirat |
| author_facet | T. Pluthametwisute T. Pluthametwisute L. Nasdala C. Chanmuang N. M. Wildner E. Libowitzky G. Giester E. G. Zoysa C. Jakkawanvibul W. Suwanmanee T. Sripoonjan T. Tengchaisri B. Wanthanachaisaeng C. Sutthirat |
| author_sort | T. Pluthametwisute |
| collection | DOAJ |
| description | <p>For decades, unraveling the heat treatment of sapphire has been a challenging issue. The present study offers new aspects that support the detection of heat treatment of sapphire. Natural geuda sapphire exhibits orange to red luminescence under longwave ultraviolet (LWUV; 365 nm) light, while heated geuda sapphire shows blue luminescence under shortwave ultraviolet (SWUV; 225 nm) light. The presence of melt inclusions in dissolved silks serves as an indicator of sapphire heat treatment. Fourier-transform infrared (FTIR) spectroscopy alone is insufficient for distinguishing unheated from heated sapphire. By combining orange to red luminescence with blue luminescence and melt inclusions, we provide a practical method for accurately differentiating natural gem-quality sapphire and heated gem-quality sapphire.</p> |
| format | Article |
| id | doaj-art-d6a3d7ca3089484c916a06ffcd5de6d8 |
| institution | Kabale University |
| issn | 1869-9510 1869-9529 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Solid Earth |
| spelling | doaj-art-d6a3d7ca3089484c916a06ffcd5de6d82025-01-24T08:48:11ZengCopernicus PublicationsSolid Earth1869-95101869-95292025-01-0116819610.5194/se-16-81-2025Luminescence and a new approach for detecting heat treatment of geuda sapphireT. Pluthametwisute0T. Pluthametwisute1L. Nasdala2C. Chanmuang N.3M. Wildner4E. Libowitzky5G. Giester6E. G. Zoysa7C. Jakkawanvibul8W. Suwanmanee9T. Sripoonjan10T. Tengchaisri11B. Wanthanachaisaeng12C. Sutthirat13Hub of Talents in Gem and Jewelry Industries, Department of Geology, Faculty of Science, Chulalongkorn University, 10330 Bangkok, ThailandInstitut für Mineralogie und Kristallographie, Universität Wien, 1090 Vienna, AustriaInstitut für Mineralogie und Kristallographie, Universität Wien, 1090 Vienna, AustriaInstitut für Mineralogie und Kristallographie, Universität Wien, 1090 Vienna, AustriaInstitut für Mineralogie und Kristallographie, Universität Wien, 1090 Vienna, AustriaInstitut für Mineralogie und Kristallographie, Universität Wien, 1090 Vienna, AustriaInstitut für Mineralogie und Kristallographie, Universität Wien, 1090 Vienna, AustriaMincraft Co., 10370 Mount Lavinia, Sri LankaThe Gem and Jewelry Institute of Thailand (Public Organization), 10500 Bangkok, ThailandThe Gem and Jewelry Institute of Thailand (Public Organization), 10500 Bangkok, ThailandG-ID Laboratories, Bangkok, 10120, ThailandScience and Technology Park (STeP), Chiang Mai University, 50200 Chiang Mai, ThailandThe Gem and Jewelry Institute of Thailand (Public Organization), 10500 Bangkok, ThailandHub of Talents in Gem and Jewelry Industries, Department of Geology, Faculty of Science, Chulalongkorn University, 10330 Bangkok, Thailand<p>For decades, unraveling the heat treatment of sapphire has been a challenging issue. The present study offers new aspects that support the detection of heat treatment of sapphire. Natural geuda sapphire exhibits orange to red luminescence under longwave ultraviolet (LWUV; 365 nm) light, while heated geuda sapphire shows blue luminescence under shortwave ultraviolet (SWUV; 225 nm) light. The presence of melt inclusions in dissolved silks serves as an indicator of sapphire heat treatment. Fourier-transform infrared (FTIR) spectroscopy alone is insufficient for distinguishing unheated from heated sapphire. By combining orange to red luminescence with blue luminescence and melt inclusions, we provide a practical method for accurately differentiating natural gem-quality sapphire and heated gem-quality sapphire.</p>https://se.copernicus.org/articles/16/81/2025/se-16-81-2025.pdf |
| spellingShingle | T. Pluthametwisute T. Pluthametwisute L. Nasdala C. Chanmuang N. M. Wildner E. Libowitzky G. Giester E. G. Zoysa C. Jakkawanvibul W. Suwanmanee T. Sripoonjan T. Tengchaisri B. Wanthanachaisaeng C. Sutthirat Luminescence and a new approach for detecting heat treatment of geuda sapphire Solid Earth |
| title | Luminescence and a new approach for detecting heat treatment of geuda sapphire |
| title_full | Luminescence and a new approach for detecting heat treatment of geuda sapphire |
| title_fullStr | Luminescence and a new approach for detecting heat treatment of geuda sapphire |
| title_full_unstemmed | Luminescence and a new approach for detecting heat treatment of geuda sapphire |
| title_short | Luminescence and a new approach for detecting heat treatment of geuda sapphire |
| title_sort | luminescence and a new approach for detecting heat treatment of geuda sapphire |
| url | https://se.copernicus.org/articles/16/81/2025/se-16-81-2025.pdf |
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