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Webinar Course Description
Visually, natural and treated diamonds can look very similar in color, but
their values would differ significantly, highlighting the importance of
detection. The use of treatments based on high-pressure, high-temperature (HPHT)
annealing, low pressure annealing and irradiation, coatings and multistep
treatments with the aim to alter the color of diamonds has become increasingly
popular in the past 10 years.
Participants will learn to identify different types of diamonds,
detect coated and heated diamonds and screen for "HPHT enhanced type IIa
diamonds". Possible treatments of natural and synthetic diamonds and their
relation to types will be analyzed in order to know when to send stones to an
advanced lab for further testing to confirm natural, treated or synthetic
origin.
Course Audience
Dealers, gemologists, and appraisers
Instructor Information
Branko Deljanin | Gemmological Research Industries Inc.
Branko Deljanin is President and Head Gemologist at CGL-GRS, Vancouver
(Canada) and Director of “Gemmological Research Industry Inc”. A graduate of the
University of Belgrade in Geology, Deljanin earned his Graduate Gemologist
diploma at GIA in 1995 and worked for three years at the GIA NY Gem
Identification department.
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 and natural pink diamonds. Branko
has conducted on-site research on gems and colored diamonds in Sri Lanka,
Russia, Brazil and Australia, and has managed many projects on diamonds. He is
expert in identification of natural, treated and synthetic diamonds and gems for
subsequent certification. Branko is instructor of “Advanced Gemology” programs
on diamonds and coloured stones he is offering in Canada, USA, Russia, Brazil,
Europe (Austria, Greece, Germany, Italy, Montenegro, Cyprus, Spain, Switzerland,
UK and Turkey), Australia and Asia (Hong Kong, Thailand).
He has been a regular contributor to trade and gemological magazines and
presented reports at a number of prestigious research and gemological
Conferences, including Mediterranean Gemmological and Jewelry Conference that he
co-founded in 2015.