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Nathan Renfro

Nathan Renfro’s interest in minerals was sparked in his late teens when he caught a glimpse of his grandfather’s rock collection. From that point, there was no turning back. In 2006, he completed his undergraduate studies in geology and then enrolled in GIA’s Graduate Gemologist (GG) program at the Carlsbad campus as a recipient of the William Goldberg Diamond Corporation scholarship. 

After earning the GIA GG diploma, Nathan was hired by GIA as a diamond grader. In 2008 he joined the Gem Identification department, in Carlsbad California, where he currently holds the position of Analytical Manager /Analytical Microscopist. 

Nathan has authored and co-authored several articles on gemology, and has lectured to gem and mineral groups throughout the United States. His primary areas of interest are inclusion identification, photomicrography, lapidary arts and defect chemistry of corundum.