OUR DENVER TEAM · GIA GRADUATE GEMOLOGIST
Your gemologist at Nina Wynn
Kevin Bui, GG, is the gemologist at Nina Wynn Fine Jewelry & Piercing in Denver. He brings formal training in diamonds and colored gemstones to the team’s approach to fine jewelry.
He earned his Graduate Gemologist diploma from the Gemological Institute of America (GIA) in Carlsbad, California, on May 29, 2026. His qualification encompasses 780 hours of study across the Graduate Diamonds and Graduate Colored Stones programs.
Gemological knowledge, thoughtful guidance
Kevin’s training includes diamond grading using the 4Cs, colored-stone identification and evaluation, and the use of professional gemological instruments. It also covers natural, treated, laboratory-grown and imitation gemstones, including recognizing when advanced laboratory testing is needed.
At Nina Wynn, this foundation supports informed conversations about gemstone quality and the characteristics that make each stone distinctive—connecting the beauty of fine jewelry with clear, knowledgeable guidance.
His gemological training
Diamonds
Grading color, clarity, cut and carat weight; evaluating quality characteristics and identifying when further testing is appropriate.
Colored gemstones
Identifying gemstones, understanding their properties and assessing the characteristics that influence quality and appearance.
Gem identification
Using professional instruments to examine stones and distinguish natural, treated, laboratory-grown and imitation materials within the scope of standard gemological testing.
View Kevin’s GIA diplomas
Kevin’s diplomas are issued under his full name, Kienvin Nam Bui. All three are dated May 29, 2026, and identify GIA’s Robert Mouawad Campus in Carlsbad, California.
Graduate Gemologist
780 hours
The combined qualification in diamonds and colored gemstones.
Graduate Diamonds
210 hours
Training in diamond identification, grading and quality assessment.
Graduate Colored Stones
570 hours
Training in gemstone identification, properties and quality evaluation.
The 210-hour Graduate Diamonds and 570-hour Graduate Colored Stones programs together form the 780-hour Graduate Gemologist qualification.
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