October 3-7—JOSHUA TREE, CALIFORNIA: Annual show; Sportsmans Club of Joshua Tree
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 Post subject: RI Birefringence Flat Facet Testing
PostPosted: Mon May 21, 2018 10:39 pm 
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Does anyone have any suggestion as to where I can get some tutoring on RI/Birefringence Flat Facet Testing? I am in New York City.


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 Post subject: Re: RI Birefringence Flat Facet Testing
PostPosted: Mon May 21, 2018 11:55 pm 
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Joined: Sun Oct 16, 2005 12:22 pm
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Location: San Francisco
Have you read our article in the Gemology Project?
http://gemologyproject.com/wiki/index.p ... ractometer


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