2023 Volume 37 Issue 1-4 Pages 3-10
We applied fluorescence fingerprint to various rubies, and analyzed the data by principal component analysis. As a result, it was found that three features mainly affect fluorescence fingerprint of ruby. The first is the red fluorescence around at λem=694 nm. The second is longer-wavelength fluorescence of Cr clusters around at λem=774 nm. The third is direction of optic axis. On the score plots, Myanmar and synthetic ruby stones were separated from the others. Especially fluorescence fingerprint of the Myanmar ruby was characteristically different from the others because of fluorescence of Cr clusters. It is suggested that fluorescence fingerprint of ruby is partially available to geographic origin determination.
