A Multi-Methodological Investigation of Natural and Synthetic Red Beryl Gemstones
Giacomo Diego Gatta; Ilaria Adamo; Andrea Zullino; Valentina Gagliardi; Roberto Lorenzi; Nicola Rotiroti; Ludovica Faldi; Loredana Prosperi
In this study, we report the experimental findings of a multi-methodological and comparative investigation of a natural (from the Wah Wah Mountains of Beaver County, Utah) and three synthetic (hydrothermally grown) gem-quality red beryls by means of: gemmological standard testing, laser ablation inductively coupled mass spectroscopy, infrared and Raman spectroscopy, ultraviolet&ndash:visible&ndash:near infrared absorption spectroscopy, and single-crystal X-ray diffraction. Gemmological, crystallo-chemical, and spectroscopic features of the natural and synthetic stones enabled us to unveil the causes of their color (from red, to purplish-red, or orange-red) and how different and complementary techniques can be efficiently used to discriminate between natural and synthetic materials, based on non-destructive, micro-destructive, and destructive techniques.
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