Jeffery Bergman, SSEF SGC

Technical Advisor

Jeffery Bergman was a contributor to the IGS long before Seth and Lisa were involved. Aside from Don Clark, he is the longest-standing contributor to IGS. In honor of his decade of friendship and support, Jeffery holds the honorary title of Vice President, Emeritus – International Gem Society. He is, and always has been, a fully pro-bono contributor and maintains no financial interest in IGS.

With humble roots from a non-gem trade family, as a lapidary hobbyist, Jeffery cut and polished his first gemstone at the age of fourteen launching him on a lifelong career which has taken him to more than 70 countries, and every continent except Antarctica. With 5 decades of broad-based experience in natural gemstones, diamonds and fine jewelry, in 2020 Jeffery founded Eighth Dimension Gems (formerly Primagem) in Bangkok, Thailand, where he has lived for over 30 years.

Jeffery’s formal gemmological training was accomplished at the prestigious Swiss Gemmological Institute in Basel, Switzerland where he passed requisite exams for his SSEF Basic Gemmology (BGC) and SSEF Basic Diamonds (BDC) Diplomas. Additionally, he completed SSEF’s Advanced Pearls (ATC), Advanced Colored Stones (ATC), and Scientific Gemmology (SGC) courses.

Featured in many gem and jewelry periodicals, Jeffery has also appeared in interviews on the ABC, BBC, CCTV, CNA, CNN, NBC and GEO. He has been quoted in Time, USA Today, National Geographic, Discover, GIA’s Gems & Gemology, Gem-A’s Journal of Gemmology, ICA’s InColor, Rivista Italiana di Gemmologia/Italian Gemological Review and many other publications around the world. A guest speaker at seven GIA Gem Gatherings as well as many gemological conferences & universities, Jeffery is also an Honorary Professor for the AIGS – Asian Institute of Gemological Sciences in Bangkok, Thailand.