Gems & Gemology Vol. 56 Issue 1 (Spring 2020) 

Gemological Institute of America 

In our lead article, authors Emily Dubinsky, Jennifer Stone-Sundberg, and John Emmett illuminate the chemistry behind gem corundum’s rich array of colors to reveal the influence of the concentrations of the six identified chromophores found in natural corundum on the depth of color. The authors use quantitative visible absorption spectroscopy and chemical analysis by secondary-ion mass spectrometry (SIMS) to study specially chosen synthetic and natural corundum samples to calculate each chromophore’s absorption cross section. This information is presented as spectra and color-circle arrays, which we hope practicing gemologists will find informative. 

195 

Gems--Periodicals , Precious stones--Periodicals 

0016-626X 

Gemological Institute of America Inc. (GIA) 

2020