Branko Deljanin, B.Sc., GG, FGA, DGA, DUG

Branko Deljanin is President and Head Gemologist at “CGL-GRS Swiss Canadian gemlab”, and founder of “Gemmological Research Industries Inc” Vancouver (Canada). He is a research gemologist with extensive experience in advanced testing of diamonds and gemstones and gemology instructor in 17 countries. Branko has conducted on-site research on gems and colored diamonds in Sri Lanka, Russia, Brazil and Australia, and has managed many projects on natural, treated and synthetic diamonds. In 2001 he earned his Advanced Gemology Diploma (DUG) from the University of Nantes in France, on the subject “Identification of HPHT treated diamonds”. He has been a regular contributor to trade and gemological magazines and presented reports at several prestigious research and gemological Conferences, including Mediterranean Gemmological and Jewelry Conference that he co-founded in 2015.

Origin of Pink Diamonds


One of the challenges in today’s gem industry is to identify quickly and accurately the origin of the color of pink diamonds - natural, treated or synthetic. This presentation aims to examine natural pink diamonds from 7 major producing countries and establish criteria to separate them by region. GRS and CGL-GRS labs have developed Fancy Plus’ grading system with additional colour sub-categories to current Fancy grading system (1-10 scale system with total 15 grades.) to better categorized coloured diamonds on the market. Pink treated and synthetic diamonds that are currently found in the market from various producers will be discussed and some suggestions will be given to dealers what they can do to spot them using standard, inexpensive instruments, such as UV lamp and portable polariscope. Finally, it is possible to separate natural pink diamonds from all categories of treated and/or laboratory-grown diamonds, lose or mounted, of any size, by use of a combination of standard and advanced gemological instruments.

Impressions from the first EGS 2007 in Idar-Oberstein

Register for the European Gemmological Symposium
on May 24 – 26, 2019 in Idar-Oberstein.

During the two days’ conference, you will enjoy numerous internationally recognized and distinguished speakers, as well as a broad spectrum of subjects including diamonds, coloured stone, pearls and jewellery.

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