American International Gemologists, AIG Appraisal
AIG Appraisal: While You Watch; While You Wait, Jewelry Appraisers!
Thursday, September 12, 2013
Swiss Gemmological Institute (SSEF), Discovers a Damaging Conch Pearl Treatment
http://www.nationaljeweler.com/nj/colored-
stones/a/~31734-New-treatment-could-damage-conch
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