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Research Leaders with World Expertise


Nicolet iS10 FT-IR Spectrometer

Nicolet iS10 FT-IR Spectrometer

CGL Canadian Gemlab is equipped with latest non-destructive advanced and research instruments:

  • VIS-NIR spectrophotometer (taking absorption spectra for color origin of diamonds and colored stones, country of origin)
  • Infrared FTIR spectrophotometer (taking absorption spectra for detection of impurities in synthetic diamonds and gems, typing of diamonds, identification of treated jade)
  • Photoluminescence spectrophotometer (taking absorption spectra for detection of HPHT treated diamonds and CVD synthetic diamonds)
  • Raman spectrophotometer (identification of any gems, ID of treated jade, fracture filled emeralds, inclusions)
  • Custom-made Portable Advanced Instruments (screening of colored and colorless diamonds for treatment and type IIa)

About Branko Deljanin

Branko Deljanin is a research gemmologist with extensive experience in advanced testing of gems and diamonds. 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 Gem Identification department on coloured diamonds, coloured stones and pearls in New York under the direction of Bob Crowningshield and Tom Moses. In 1998, Deljanin was appointed Director of Gem Identification and Research for the EGL USA Group. From 2002 to 2009 he was Director in charge of a new EGL Canadian Division and he helped grow the new business to over $1,000,000 in annual revenue during that time.

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, he has spent a great deal of time on studying HPHT treatments of natural diamonds and ID of synthetic diamonds (HPHT and CVD), natural pink diamonds, and is internationally recognized as a diamond authority. 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 conducted on-site research on gems and coloured diamonds in Sri Lanka, Russia, Brazil and Australia, and has managed many research projects on natural, treated and synthetic diamonds in partnership with international labs, producers and universities around the world.

Branko has been a regular contributor to trade and gemmological magazines (Rapaport, Idex, Canadian Jewellery, Canadian Business Jewellery, New York Diamonds, Jewellery News Asia, Gems and Gemology) and in addition has presented reports at a number of prestigious research conferences (European Diamond, De Beers, Canadian Gemmological, Material Research, GIA and Asian Gemological Conferences). In 2004, 2005 and 2006 Branko was a finalist for the AGA “Antonio Bonnano Award for Excellence in Gemology”. He is regularly an invited speaker at AGTA, AGA, GIA Alumni, ICA, NAJA and NCJV trade organizations.

In addition to the articles captioned below, 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)”. Branko is instructor of “Advanced Gemology” programs on diamonds and coloured stones currently offered in Canada, USA, Russia, Brazil, Greece, Spain, Switzerland, UK, Turkey, Hong Kong, Thailand and Australia.

Publication and References

Article: ‘A Pearl of Wisdom – An Overview of this Organic TreasureB.DeljaninBusiness Jewellery, June 2015

Article: ‘World of Pink Diamonds and their IdentificationB.Deljanin, Dr. A. Peretti, M. Allesandri,  InColour Magazine, Spring 2015

Article: ‘Chameleon Diamonds – How Heat and Darkness Bring out the Best in these Colour Changing StonesBusiness Jewellery, February 2015

Article: Pretty in pinkHow origin reports for pink diamonds may affect their value’, B.DeljaninBusiness Jewellery, August 2014

Article: ‘New Generation of Synthetic Diamonds Reaches the Market: Lab-grown Blue CVD Diamonds’, Peretti A., Herzog F., Bieri W., Alessandri M., Günther D.,Frick D., Cleveland, E., Zaitsev A.M., Deljanin B.  Contribution to Gemmology, March 2014

Article: ‘New Generation of Synthetic Diamonds Reaches the Market: Lab-grown Pink CVD Diamonds’, Deljanin B , Herzog F., Bieri W., Alessandri M., Günther D.,Frick D., Cleveland, E., Zaitsev A.M., Peretti A. Contribution to Gemmology, March 2014

Article: ‘New Generation of Synthetic Diamonds Reaches the Market: Lab-grown Yellow CVD Diamonds’, Zaitsev A.M, Deljanin B , Peretti A., Alessandri M., Bieri W.  Contribution to Gemmology, March 2014

Article: ‘A closer look: Screening synthetic diamonds with standard gem instruments’, B.Deljanin. Business Jewellery, March 2014

Article: Fancy that, A technical take on Fancy coloured diamonds’, B.Deljanin.  Business Jewellery, December 2013

Article: ‘A heated question, what Canadian jewellers should know about tanzanite’B.Deljanin Business Jewellery, August 2013

Article:Screening of Colourless and Colored Diamonds for Synthetic Origin’ Rivista Gemmologica Italiana, Italy (in Italian), 2013 

Conference paper:Screening of Colourless and Coloured Diamonds for Synthetic Origin with lamp and with ID with Polariscope mounted on microscope; Extended abstract and oral presentation.  GIT International Conference, Bangkok, Thailand, 2012

Article: The name game, Is origin the deciding factor? B.Deljanin.  Business Jewellery, December 2012

Article: ‘Shades of Jade, Are you selling the real deal? B.Deljanin.   Business Jewellery, August 2012

Booklet: ‘Identifying Diamond Types and Synthetic Diamonds with CPF (Cross Polarized Filters)’, D.Simic, B.Deljanin.  D&S Gemological Service, 2010.

Conference paper:’Identification of Stable color, Enhanced colorless and Colored Diamonds, processed by Suncrest Diamonds,USA’, D.Simic, S.Pope, B.Deljanin. Poster.  European Diamond Conference, Athens, Greece 2009.

Article: ‘Characterization of pink diamonds of different origin: Natural from Argyle, irradiated, HPHT treated, treated with multi-process, coated and synthetic’,  B. Deljanin, D. Simic, A. Zaitsev, J. Chapman, T. Middleton, A. De Stefano, et al. Proceedings Volume of Diamond and Related Materials 2008.

Conference paper: ‘Novel Optical Characteristics of Pink Diamonds with Pink Coloration’, I. Dobrinets,  A. Zaitsev, N. Del Re, J. Chapman, B. Deljanin. Poster.European Diamond Conference, Sitges, Spain 2008.

Book: ‘Diamates de Laboratorio, Guia de informacoes sobre Diamntes Gerados por HPHT e CVD’,   B. Deljanin, D. Simic. GHI, 2nd Segunda Edicao (Portuguese),  2008.

Book: ‘Laboratory-grown Diamonds, Information Guide to HPHT-grown and CVD-grown Diamonds’, B. Deljanin, D. Simic. GHI, 2nd edition, 2007.

Conference paper: ‘Identification of Fancy Color Laboratory-grown Diamonds Smaller than 0.09 ct “, D. Simic, B. Deljanin; Poster.De Beers Diamond Conference, Warwick, 2007.

Article: Analyzing HPHT’, D. Simic, B. Deljanin.  New York Diamonds and Business Jewellery Magazine, 2006.

Conference paper: Characterization of Sapphires from Yogo, Montana’, A. Cade, B. Deljanin, L. Groat, M. Epelboym. GIA Gemological Research Conference, San Diego, 2006.

Conference paper: Study of HPHT-grown Diamonds by Advanced Optical Technologies Corporation    (AOTC)’, B. Deljanin, D. Simic, M. Epelboym, A.M. Zaitsev. Poster and Oral presentation. European Diamond Conference, Porto, De Beers Research Conference, Cambridge, and Gemological Research Conference, San Diego, 2006.

Conference paper: Identification problems and solutions for small (0.01 – 0.10 ct) Fancy color synthetic diamonds set in jewelry’, D. Simic.  International Jewelry Conference, Bangkok, 2006.

Article: ‘Provo Rose, rare 10 ct pink diamond, the latest generation of processed pinks’, D. Simic, B. Deljanin.  Idex Magazine, 2005.

Conference paper: Cross Reference Identification System (CIS) – Database and Tool for Diamond Research’, D. Simic, B. Deljanin; Poster.  European Diamond Conference, Lyon, and De Beers Research Conference. Oxford, 2005.

Article: A Gemological Study of a Collection of Chameleon Diamonds’, T. Hainschwang, ‘D. Simic, E. Fritsch, B. Deljanin, S. Woodring, and N. DelRe. Gems & Gemology, Spring 2005.

Article: “IIb or not IIb (diamonds) that is the question?” D. Simic, S. Woodring, B. DeljaninRapaport, 2005.

Article: Stability Test of Artificially Irradiated Colored Diamonds’, D. Simic, S. Woodring, B. Deljanin. Rapaport, 2004.

Article: Processed Pinks’, D. Simic, S. Woodring, B. Deljanin.Rapaport, Nov. 2004.

Conference paper: Use of chatodoluminescence techniques for the separation of gem-quality type IIa natural, HPHT-treated and lab-created diamonds (HPHT and CVD)’, B. Deljanin, H. Kanda, J. Ponahlo, D. Simic, E. Fritsch; Poster.  European Diamond Conference, Lago di Garda, 2004.

Article: Polishing up on Rough’, B. Deljanin, E. Semenets. Canadian Diamonds, October 2004.

Conference paper: Identification of CVD gem-quality, single crystal diamonds, as grown and HPHT- treated’, B. Deljanin, T. Hainschwang, E. Fritsch, J.P. Chalain, H. Kanda, J. Ponahlo, D. Simic, M. Krzemnicki, M. Akaishi, R. Linares; Oral presentation. ICNDST – Tokyo and De Beers Research Conference, Warwick, 2004.

Conference paper: New challenge for jewelry industry: Laboratory-grown CVD gem-quality diamonds’, B. Deljanin, D. Simic. R. Linares; Oral presentation. Material Research Conference, Boston, 2003.

Article: ‘Update on study of CVD diamonds’, B. Deljanin, T. Hainscwang, e. Fritsch. Jewellery News Asia, December 2003 (English and Chinese).

Article: HPHT-processed diamonds from Korea’ D. Simic, B. Deljanin. Gems & Gemology, Vol. 39, Fall 2003.

Conference paper: Characterization of type IaB diamonds under High Pressure High Temperature Treatment (HPHT)’, B. Deljanin, E. Fritsch; Oral presentation. European Diamond Conference, Budapest, 2001.

Conference paper: A new HPHT process to modify color of natural diamonds’, B. Deljanin, E. Fritsch; Poster. European Diamond Conference; Porto, 2000.

Booklet: Changing the Color of Diamonds: The High pressure High Pressure Explained’, B. Deljanin, G.E. Sherman.  EGL USA, 2000.

Conference paper: Classification and Heat Treatment of Geuda sapphire at Ratnapura, Sri Lanka’, B. Deljanin; Poster, GIA Symposium, San Diego, 1999

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