Marco Giarola, Gino Mariotto, Marianna Barberio and David Ajò Raman spectroscopy in gemmology as seen from a ‘jeweller's’ point of view Journal of Raman Spectroscopy 43
Some gemmological objects (diamonds, coloured stones or assembled gems) found in the jewellery's commerce when observed by an optical microscopy or even at naked eye, exhibit unusual characteristics, such as inclusions incorporated at different depths beneath the sample surface. Their investigation by confocal Raman micro-spectroscopy allowed for the identification of a blue sapphire and of nanocrystalline anatase in the same surface region of a cut and polished diamond gem. Moreover, several inclusions of unusual shape, embedded into the bulk of a coloured gemstone, were identified as α-Fe2O3. Finally, a detailed micro-Raman characterization investigation of the different component parts of an assembled gem, evidenced spectral features that can be put in relation with its fabrication process.
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