Abstract
AbstractNineteen 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.
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