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 Post subject: links to ethiopian opal grading and pattern recognition
PostPosted: Sat Jan 19, 2013 5:06 pm 
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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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 Post subject: Re: links to ethiopian opal grading and pattern recognition
PostPosted: Mon Jan 21, 2013 2:12 am 
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Wow, really surprised no one steped up to the plate but I did find it so here it is for those that are interested.
http://www.gemval.com/opal-color-grade.html


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 Post subject: Re: links to ethiopian opal grading and pattern recognition
PostPosted: Mon Jan 21, 2013 12:36 pm 
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That is not specifically for Ethiopian opals.
Here is a good page:
http://www.opalauctions.com/docs/opal-i ... ding-chart


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 Post subject: Re: links to ethiopian opal grading and pattern recognition
PostPosted: Tue Jan 22, 2013 5:25 pm 
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and here is a more inclusive and updated version of the one Barbra posted.
http://www.opalauctions.com/docs/opal-i ... l-patterns


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 Post subject: Re: links to ethiopian opal grading and pattern recognition
PostPosted: Tue Jan 22, 2013 10:11 pm 
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