Analysis of Fissure-filled Emeralds and Rubles by Diffuse Reflectance Fourier Transform Infrared Spectroscopy
Abstract
Although diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) is mainly used for powdered solid samples, it was found to be highly effective for the analysis of certain gemstones. Small amounts of oils and resins used to fill cracks and fissures in substandard (included) emeralds and rubies could be detected. Because of their very low levels, these organic adulterants can be difficult to detect by measurement of the infrared transmittance spectrum. Rubies have a significantly larger 'window-of- detection' for organic clarifying agents than do emeralds. In some cases the spectral information was sufficient to identify the oil or polymer resin. Emeralds that were treated over 20 years ago are still easily identified. The position of the emerald or ruby in the sample holder can affect the intensity of C-H and O-H stretching frequencies as well as those bands characteristic to the gemstones.
Recommended Citation
D. W. Armstrong et al., "Analysis of Fissure-filled Emeralds and Rubles by Diffuse Reflectance Fourier Transform Infrared Spectroscopy," Analytical Letters, vol. 33, no. 1, pp. 111 - 123, Taylor and Francis Group; Taylor and Francis, Jan 2000.
The definitive version is available at https://doi.org/10.1080/00032710008543040
Department(s)
Chemistry
Keywords and Phrases
Adulteration; Gems; Nondestructive Testing; Oils; Resins
International Standard Serial Number (ISSN)
0003-2719
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Taylor and Francis Group; Taylor and Francis, All rights reserved.
Publication Date
01 Jan 2000
