Blog der Deutschen Gemmologischen Gesellschaft

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Herausgeber: 
Deutsche Gemmologische Gesellschaft e.V.
Prof.-Schlossmacher-Str. 1
D-55743 Idar-Oberstein

 

Copyright:
Für alle Beiträge behält sich die Deutsche Gemmologische Gesellschaft (Deutsche Gesellschaft für Edelsteinkunde) e.V. sämtliche Rechte vor, insbesondere die des Nachdrucks, der Übersetzung in andere Sprachen und der photomechanischen Wiedergabe. Die veröffentlichten Beiträge stellen – soweit namentlich bezeichnet – die Auffassung der Autoren dar und geben nicht notwendig die Meinung von Herausgeber und Schriftleitung wieder. (Content of this journal may not be reproduced in any form without the permission of the German Gemmological Association. Opinions expressed do not necessarily reflect the views of the Association.)

An emerald of 1.40 ct from Afghanistan (collection of DGemG).

Comparison of Emeralds from the Chitral District, Pakistan, with other Pakistani and Afghan Emeralds

Details

Emeralds from various deposits in Pakistan (Chitral, Swat and Khaltaro) and Afghanistan (Panjshir and Laghman) were examined and compared. In addition, we compared the lighter-coloured Chitral emeralds from our previous study to newly acquired, more deeply coloured samples from Chitral. The specimens were characterised by Raman, FTIR and UV-Vis-NIR spectroscopy. Chemical analyses by EPMA and LA-ICP-MS also were performed on the samples from Chitral and Khaltaro. Distinguishing features of our Chitral emeralds include a lack of three-phase inclusions, a strong Fe2+-related absorption at about 830 nm in the UV-Vis-NIR spectra, and elevated Cs and Li contents. These characteristics may provide clues for geographic origin determination.

 

This article was first published in The Journal of Gemmology, 38(6), 2023, pp. 582-599. A pdf-file of this article is available here.

 

Authors

Carina S. Hanser, Institute of Geosciences, Johannes Gutenberg University Mainz, Germany and Institute of Gemstone Research, Idar-Oberstein, Germany
Dr. Tom Stephan, DGemG
Bilal Gul, Department of Geology, University of Tartu, Estonia
Dr. Tobias Häger and Prof. Dr. Roman Botcharnikov, both Institute of Geosciences, Johannes Gutenberg University Mainz, Germany and Institute of Gemstone Research, Idar-Oberstein, Germany


© 2023 by Gem-A

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