Friday
Jul222011
An Australian Company introduces an Opal Grading System
Fri, July 22, 2011 at 9:41 AM Carlsbad, Calif.--Opal Horizon Ltd., a Brisbane, Australia-based opal mining, sales and marketing company, presented a new, comprehensive system for grading gem quality opals on at the Gemological Institute of America’s 2011 Symposium.
