I was recently asked the above question about lab grading reports for colored diamonds. I would have to say that I am more partial to colored diamond reports from the Gemological Institute of America (G.I.A.). In my 30 plus years of experience in the jewelry industry, I have never been disappointed by a colored diamond lab grading report from G.I.A. After all, there is a reason G.I.A. is referred to as “The Worlds Most Foremost Authority in Gemology.”
International Gemological laboratory (I.G.I.) is a legitimate gemological laboratory. However, It is my experience that most professional gemstone dealers and consumers prefer G.I.A. lab grading reports to an I.G.I. lab grading report. I hope this helps.
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Joseph R. Villarreal, Graduate Gemologist (G.I.A.)