A Fine Opal Specimen

Under Opal Horizon Ltd.’s recently introduced grading system, gem opals, such as the one pictured here, that are of exceptional quality with a high visual impact and full spectral play of color are graded “exceptional.”

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.

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