Post subject: links to ethiopian opal grading and pattern recognition
Posted: Sat Jan 19, 2013 5:06 pm
Established Member
Joined: Wed Mar 30, 2011 8:54 pm Posts: 18
New development creates an extreme rush so I appologize in advance for using the forum without doing proper research before asking this. I am looking for an old link that is listed here somewhere but can't find it and time is an issue. OA and IGS does not use or have the information I am looking for! There was a contriversial colored gemstone website that listed retail values of colored gemstones that also had a Ethiopian pattern identification along with brightness scale I think was a 1-10 scale on brightness and a % of POC as a part of that grading system. That percent of coverage information is what I am looking for......Can anyone kindly help me out with some links that has detailed information on establishing the %of POC coverage?
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