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The Gemological Institute of America, GIA,
is one of the world's foremost authority in gemology, its an independent nonprofit organization. |
| http://www.gia.org/ | |
| EGL USA | European Gemological Laboratory provides diamond, colored stone and pearls certification, analysis and consultations for the jewelry industry. |
| http://www.eglusa.com/ | |
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American Gem Society Laboratories is one of the leading Diamond grading Laboratories in the Gem & Jewelry industry. |
| http://www.agslab.com/ | |