Branko Delijanin
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Branko Deljanin is President and Head Gemologist at CGL-GRS, Swiss Canadian Gemlab Inc., Vancouver (Canada). He is a research gemologist with extensive experience in advanced testing of diamonds and gems. A graduate of the University of Belgrade in Geology, Deljanin earned his Graduate Gemologist diploma at GIA in 1995 and worked at the GIA Gem Identification department in New York. Branko is a Fellow of the Gemmological Association of Great Britain and served as an instructor for their FGA and DGA Programs from 2000 to 2005. Since 1999 when he detected first coloured HPHT enhanced diamonds on the market, he has spent a great deal of time studying HPHT treatments of natural diamonds and ID of synthetic diamonds (HPHT and CVD), and natural pink diamonds. He first issued Grading Certificates for Synthetic Diamond (Russian) in New York in 2000, and created terminology "Laboratory Grown." In 2001 he earned his Advanced Gemology Diploma (DUG) from the University of Nantes in France, on the subject "Identification of HPHT treated diamonds."

Branko has been a regular contributor to trade, gemological and scientific magazines and in addition has presented reports at a number of research conferences. He is regularly an invited speaker at shows, events and conferences organized by AGTA, AGA, AGIL, ASA, AGS, De Beers, GIA, ICA, GIT, GemA, NAJA and NCJV trade and lab organizations.

Deljanin has co-authored books Laboratory Grown Diamonds, Information Guide to HPHT- Grown and CVD-Grown Diamonds and Identification of Diamond Types and Synthetic Diamonds Using CPF (Cross Polarized Filters), and Fluorescence as a Tool for Diamond Origin Identification – a Guide. Branko is instructor of “Advanced Gemology” programs on diamonds and gems currently offered in Australia, Brazil, Canada, Greece, Hong Kong, Italy, Spain, Russia, Serbia, Switzerland, UK, Turkey, Thailand, and the USA.


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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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