Many minerals, in original form or considered as gemstones, have unique Raman spectra. That spectra can be used to verify that a stone has been identified correctly. As most gemstones are natural materials created in a very complex environment, spectral variations related to the chemical and structural differences are expected. Yet the major peaks of gemstone spectra are quite consistent.
The Raman spectrometer is routinely used for the detection of emerald fillers, HPHT treatment of diamonds, analysis of the nature of a gemstone, analysis of gemstone inclusions and treatments, and the characterisation of natural or colour enhanced pearls and corals.
Example of Timegated® results in gemmology
Below you can see some measurements made by Timegated® with some comparison to equivalent CW Raman and without.