JAS is an independent diamond, gemstone and jewelry appraisal services division of AIGS, the Asian Institute of Gemological Science. Our founders have over 5 decades of experience in the gemstone, diamond and fine jewelry industry. JAS accurately documents and determines current retail replacement value of diamonds, gemstones and fine jewelry providing the only way to be confident your insurance coverage is adequate to protect against loss, theft or damage.

Jeffery Bergman is an American born precious gemstone dealer and gemmologist with 5 decades of broad-based experience in natural gemstones, diamonds and fine jewelry.

Co-Founder and Director of https://www.eighthdimensiongems.com in Bangkok, Jeffery cut & polished his first gemstone at the age of fourteen starting him on a lifelong career which has taken him to more than 70 countries, and every continent except Antarctica. His formal gemmological training was accomplished at SSEF, the prestigious Swiss Gemmological Institute in Basel, Switzerland where he successfully completed his Basic, Diamonds, Advanced Pearls, Advanced Colored Stones & Scientific Gemmology courses qualifying him as an SSEF SGC. He is also a Senior Accredited Gemologist voting member of the Accredited Gemologists Association.

Jeffery’s gemstone cutting experienced has contributed greatly to his expertise as a colored gemstone, diamond and fine jewelry supplier and appraiserCNA, . Working one-on-one with some of the most technically advanced cutting factories in Asia insures he is able to supply finished products meeting the very highest of international standards. While based in Thailand, demand for his expertise regularly takes him to the trading centers of the world visiting clients in Paris, Geneva, London, New York, Hong Kong, Shanghai and Yangon.

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. Jeffery is a frequent guest speaker at GIA Gem Gatherings, gemological conferences & universities, a regular contributor to gemological and other publications, Honorary Professor for the AIGS – Asian Institute of Gemological Sciences, and Vice President, Emeritus of the IGS – International Gem Society.