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GIA instructors are passionate educators who bring years of industry experience to the classroom. All are leaders in their fields, and all are dedicated to helping you gain knowledge, acquire skills and launch your career.
gemology
PITCHAYA LOPITI
Pitchaya graduated with a Bachelor’s degree in Material Science specializing in gemology from Srinakharinwirot University in Thailand. Pitchaya joined GIA in Thailand in 2011. She has earned the GIA Graduate Gemologist® diploma (GG™), Graduate Pearls diploma(GP), and Applied Jewelry Professional™ (AJP®). In her role as an instructor, she has been teaching the entire range of GIA gemology programs and has given numerous trade seminars both domestic and international. She previously worked in international logistics and jewelry companies which have provided her broad experience in all industry aspects as well as in gemstone identification. In 2016, Pitchaya received the prestigious GIA Staff of the Year Award for her outstanding contributions. She became Manager of Instruction at GIA in Thailand in 2018. Her solid background in gemology, along with her expertise in gemology makes her a valuable source of information for her students enabling them to achieve their goals and succeed in their careers.
TEERARAT PLUTHAMETWISUTE
Teerarat Pluthametwisute holds a Bachelor of Science degree in Gem and Jewelry from the Faculty of Gems at Burapha University (Chanthaburi Campus) and a Doctorate in Geology from Chulalongkorn University. He joined GIA in 2025 as an associate instructor, sharing his expertise in gemology and advanced spectroscopy with students at the Bangkok campus.
RAVENYA ATCHALAK
Ravenya Atchalak holds a Bachelor of Science in Gemology from Chiang Mai University and GIA credentials including Graduate Gemologist®, Pearls, Applied Jewelry Professional™, and Certified Pearl Associate. After gaining experience in diamond grading and manufacturing, she joined GIA in 2021 and later became a gemologist in GIA's Pearl Department, specializing in pearl identification, treatment detection, and classification. Her work included advanced gemological analysis and pearl research. She currently serves as an Instructor at GIA Bangkok, where she shares her technical expertise and industry experience with students.
SUPHASUTA PHATTHARAWARIN
Suphasuta Phattharawarin combines academic studies in Digital Art, Entrepreneurship and Management with a GIA Graduate Gemologist diploma. Leveraging her experience in the jewelry industry, she joined GIA Bangkok as an Associate Instructor in 2026. In this role, she shares her gemological expertise and real-world industry perspectives to support student learning and professional development.
