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Spectroscopic Characteristics of Gemstones with Color Change Effect  

Ahn, Yong-Kil (Department of Materials & Chemical Engineering, Hanyang University)
Seo, Jin-Gyo (Division of Materials Science & Engineering, Hanyang University)
Park, Jong-Wan (Division of Materials Science & Engineering, Hanyang University)
Publication Information
Journal of the Mineralogical Society of Korea / v.22, no.2, 2009 , pp. 81-86 More about this Journal
Abstract
The luminescence and fluorescence were investigated by photoluminescence spectroscopy for six gemstones which exhibit color change effect. The shape of luminescence peaks appears different when observed by a photoluminescence spectroscopewith a 514 nm Ar laser source. However, it was not possible to observe the difference in the spectra between the natural and synthetic origins for the same type of gemstones. It was found that the photoluminescence spectrum was related to the crystal structure of the stones. Photoluminescence spectra using a 325 nm He-Cd source reveal that fluorescence is relatively strong for synthetic alexandrite, synthetic color change sapphire and natural alexandrite comparing to the rest of gemstones examined.
Keywords
color change effect; UV-Vis spectroscopy; photoluminescence; fluorescence;
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