Nathan Renfro
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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.


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The American Gem Society (AGS) is a nonprofit trade association of fine jewelry professionals dedicated to setting, maintaining and promoting the highest standards of ethical conduct and professional behavior through education, accreditation, recertification of its membership, gemological standards, and gemological research.

The Society is committed to providing educational products to inform and protect the consumer and to contributing to the betterment of the trade by creating industry standards to protect the jewelry-buying public and the fine jewelry industry as a whole.

AGS Laboratories, founded to support the AGS mission, is a nonprofit diamond grading laboratory with a mission of consumer protection. Adhering to the AGS Diamond Grading Standards, AGS Laboratories is dedicated to offering diamond grading reports that provide consistency and accuracy based on science.

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