Spectroscopic study of the coloured gems in a 19th century pendant from Einsiedeln Abbey,Journal of Raman Spectroscopy

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Spectroscopic study of the coloured gems in a 19th century pendant from Einsiedeln Abbey
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2021-07-28 , DOI: 10.1002/jrs.6194
Stefanos Karampelas ₁ , Marie Wörle ₂

Affiliation

Nineteen green-coloured gems adorning a cross-shaped pendant from the end of 19th century, belonging to Einsiedeln Abbey (Switzerland), were examined using non-destructive methods. Estimated weights of the gems are ranging from about 0.19 to 2.34 carats. Natural multiphase inclusions with jagged outlines were observed in all samples under optical microscope. Raman bands characteristic of beryl were observed in all samples with a 532-nm laser excitation. Raman spectra of the samples with a 785-nm laser at higher wavenumber found to be similar to emeralds containing low concentration of alkali elements. Their ultraviolet–visible–near-infrared (UV–Vis–NIR) spectra display absorption bands related to chromium and vanadium; no absorption bands related to iron were observed. Using a combination of spectroscopic and microscopic methods, the samples were adequately identified as natural emeralds, with Colombia as their most probable source.

中文翻译：

Einsiedeln Abbey 19 世纪吊坠中彩色宝石的光谱研究

从 19 世纪末开始，属于 Einsiedeln Abbey（瑞士）的十字形吊坠上的 19 颗绿色宝石经过无损检测。宝石的估计重量约为 0.19 至 2.34 克拉。在光学显微镜下，所有样品均观察到具有锯齿状轮廓的天然多相夹杂物。在 532 nm 激光激发下，在所有样品中均观察到绿柱石的拉曼谱带特征。使用 785 nm 激光在较高波数下对样品的拉曼光谱发现与含有低浓度碱元素的祖母绿相似。它们的紫外-可见-近红外 (UV-Vis-NIR) 光谱显示与铬和钒相关的吸收带；没有观察到与铁有关的吸收带。结合光谱和显微方法，

更新日期：2021-07-28

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