Translate

Monday, June 27, 2011

Opal Update

Opal Horizon Ltd, an Australian-based opal mining company has introduced a new comprehensive grading system for natural gem quality precious opals based on three quantifiable grading criteria: category, color and cut. All the best.

Useful links:
http://www.opalhorizon.com
http://www.gia.edu/symposium2011



No comments: