HIDDEN MENU ITEMS
Twitter Feed

Entries in Grading (1)

Friday
Jul222011

An Australian Company introduces an Opal Grading System

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.

Click to read more ...