The use of a Raman spectral database of minerals for the rapid verification of semiprecious gemstones was demonstrated. Ninety-six semiprecious gemstones were placed in a glass-bottomed 96 micro well plate for this demonstration. Raman spectra were obtained from 96 semiprecious gemstones using a Thermo Scientific DXR Smart Raman System. The system was configured with an automated x-y stage designed to hold SBS standard micro well plates. Oriented spectra were obtained using a special system designed for polarization studies with a 514-nm laser, while high-resolution spectra were obtained using Raman instrument. It was observed that different samples produced different levels of Raman signal, which proved that autoexposure feature could be used to obtain a desired signal level. The use of 'full range' option on the Raman instruments provided a tool to verify if a sample was treated with polymer or epoxy.
|Original language||English (US)|
|Journal||Spectroscopy (Santa Monica)|
|State||Published - May 1 2009|
ASJC Scopus subject areas
- Analytical Chemistry
- Atomic and Molecular Physics, and Optics