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conoscopy explained
https://gemologyonline.com/Forum/phpBB2/viewtopic.php?f=22&t=11719
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Author:  cascaillou [ Sat Jul 10, 2010 8:40 am ]
Post subject:  conoscopy explained

http://jm-derochette.be/conoscopy.htm

Author:  Barbra Voltaire, FGG [ Sat Jul 10, 2010 10:48 am ]
Post subject:  Re: conoscopy explained

The Gemology Project does a good job explaining as well:
http://www.gemologyproject.com/wiki/ind ... olariscope

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