Photochromic gemstone analysis using in situ absorption spectroscopy

Tsung-Han Tsai; Ulrika F. S. D’Haenens-Johansson; Zhen Wang

doi:10.1117/12.2672807

28 September 2023 Photochromic gemstone analysis using in situ absorption spectroscopy

Tsung-Han Tsai, Ulrika F. S. D’Haenens-Johansson, Zhen Wang

Proceedings Volume 12665, Novel Optical Systems, Methods, and Applications XXVI; 126650J (2023) https://doi.org/10.1117/12.2672807
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

Photochromic gemstones exhibit optically controllable coloration at ambient temperatures, strongly affecting their visual appearance and potential market value. As a result, a comprehensive study of characteristic photochromic properties is required to estimate the potential influence on gemstone evaluation. A UV-Visible absorption spectrometer integrating a tunable light source for external excitation has been developed to investigate the wavelength- and time-dependence of photochromism for colored gemstones, focusing on natural, laboratory-grown, and color-treated pink diamonds. The results can be used to develop a color stabilization protocol to improve the reliability of color grading for valuable gemstones.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Tsung-Han Tsai, Ulrika F. S. D’Haenens-Johansson, and Zhen Wang "Photochromic gemstone analysis using in situ absorption spectroscopy", Proc. SPIE 12665, Novel Optical Systems, Methods, and Applications XXVI, 126650J (28 September 2023); https://doi.org/10.1117/12.2672807

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