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Gemological Laboratories
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Provides diamond, colored stone and pearls certification, analysis and consultations.
http://www.eglusa.com/
PageRank: 0/10
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The world’s largest and most respected nonprofit institute of gemological research and learning.
http://www.gia.edu
PageRank: 0/10
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The world's largest independent gem certification and appraisal institute and is renowned for its quality services, extensive experience and know-how.
http://www.igi-usa.com/
PageRank: 0/10
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