An Update on Color in
Gems. Part 1:
Introsuction and Colors Caused by
Dispersed Metal Ions
Emmanuel
Fristch
Gemological Institute of America
Santa Monica, California, USA
George
R. Rossman
California Institute of Technolgy, Pasadena, CA, USA
Overview
This is the first part in a three-part series on the origin of color
in gem materials. This article discusses colors produced by individual
metal ions in crystals
Gems
and Gemology 23, 126-139