Identification of Heat-Treated Sapphires from Sri Lanka: Evidence from Three-Dimensional Fluorescence Spectroscopy

Heat treatment is an important method used to improve the value of sapphires. The identification of heat-treated sapphires is a significant and challenging subject in gemology. In this study, natural sapphire samples from Ratnapura, Sri Lanka, were heated at different temperatures from 900 °C to 150...

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Published inCrystals (Basel) Vol. 12; no. 2; p. 293
Main Authors Zhang, Yuyang, Chen, Meihua
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.02.2022
Subjects
Analytical chemistry
Color
Excitation spectra
Fluorescence
Heat
Heat treatment
High temperature
Identification methods
Light
Low temperature
Oxidation
Sapphire
Spectroscopy
spectroscopy characteristics
three-dimensional fluorescence spectroscopy
Sri Lanka
China
Germany
Online AccessGet full text
ISSN2073-4352
2073-4352
DOI10.3390/cryst12020293

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Abstract Heat treatment is an important method used to improve the value of sapphires. The identification of heat-treated sapphires is a significant and challenging subject in gemology. In this study, natural sapphire samples from Ratnapura, Sri Lanka, were heated at different temperatures from 900 °C to 1500 °C. Then, the samples were examined by FTIR and three-dimensional fluorescence spectrometry. When excited by 450 nm light, most natural samples emitted a fluorescence band between 540 nm and 560 nm. This fluorescence disappeared after low-temperature heat treatment. Therefore, the presence of fluorescence between 540 nm and 560 nm is evidence of unheated sapphires from Sri Lanka. Almost all of the samples emitted fluorescence centered at 470 nm after high-temperature treatment. Therefore, fluorescence at 470 nm indicates that the sapphires from Sri Lanka were treated at a high temperature. Three-dimensional fluorescence spectroscopy can serve as a method to identify heat-treated sapphires.
AbstractList Heat treatment is an important method used to improve the value of sapphires. The identification of heat-treated sapphires is a significant and challenging subject in gemology. In this study, natural sapphire samples from Ratnapura, Sri Lanka, were heated at different temperatures from 900 °C to 1500 °C. Then, the samples were examined by FTIR and three-dimensional fluorescence spectrometry. When excited by 450 nm light, most natural samples emitted a fluorescence band between 540 nm and 560 nm. This fluorescence disappeared after low-temperature heat treatment. Therefore, the presence of fluorescence between 540 nm and 560 nm is evidence of unheated sapphires from Sri Lanka. Almost all of the samples emitted fluorescence centered at 470 nm after high-temperature treatment. Therefore, fluorescence at 470 nm indicates that the sapphires from Sri Lanka were treated at a high temperature. Three-dimensional fluorescence spectroscopy can serve as a method to identify heat-treated sapphires.
Author Chen, Meihua
Zhang, Yuyang
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10.1038/nmeth817
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StartPage 293
SubjectTerms Analytical chemistry
Color
Excitation spectra
Fluorescence
Heat
Heat treatment
High temperature
Identification methods
Light
Low temperature
Oxidation
Sapphire
Spectroscopy
spectroscopy characteristics
three-dimensional fluorescence spectroscopy
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Title Identification of Heat-Treated Sapphires from Sri Lanka: Evidence from Three-Dimensional Fluorescence Spectroscopy
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