The use of a raman spectral database of minerals for the rapid verification of semiprecious gemstones

Steve Lowry, Dick Wiebolt, Dave Dalrymple, Renata Jasinevicius, Robert T. Downs

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

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 languageEnglish (US)
JournalSpectroscopy (Santa Monica)
Volume24
Issue number5
StatePublished - May 1 2009

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

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