A database of Raman spectra of precious gemstones and minerals used as cut gems obtained using portable sequentially shifted excitation Raman spectrometer

Raman spectra of 42 minerals, commonly and less frequently used as gemstones in gemmology s. s. or works of arts, have been recorded using a portable sequentially shifted excitation Raman spectrometer. Analyzed minerals include chrysoberyl, diamond, emerald, garnets, magnesiotaaffeite-2N'2S (taaffeite), magnesiotaaffeite-6N'3S (musgravite), ruby, topaz as well as other less precious minerals. Some minerals are represented by several different samples with various causes for fluorescence in order to ascertain the results of the fluorescence removal process on a larger set of natural mineralogical samples. This novel instrumentation is able to effectively suppress the laser-induced fluorescence that is sometimes present in the Raman spectra of natural and often coloured samples of mostly silicate minerals, and at the same time allow the analyses of gemstones and works of arts in situ, which can be important in many cases.