Separation of Argyle brown, blue and pink diamonds from new generation of “natural looking” CVD-grown diamonds

Abstract: The Argyle mine in Western Australia has been the major source of natural brown and rare pink diamonds since the 1980s. Argyle also produce rare gray-blue type Ia diamonds that could be separated from type IIa boron rich diamonds from other world localities. There has been an increasing number of synthetic diamonds in the jewelry market over the past decade, especially diamonds grown by CVD method. We are reporting on distribution of “naturally looking” type IIa CVD-grown brown diamonds from Scio Diamonds in USA and treated pink and as-grown blue (Si doped) diamonds by Orion (PDC) company in Hong Kong. They could be separated from similar looking natural brown, pink and blue diamonds from Argyle mine by using of combination of standard instruments (Cross Polarized Filters, UV lamp) and advanced spectrometers (VIS, FTIR and PL at LN temperatures).

CURRICULUM VITAE

Branko Deljanin, B.Sc., GG, FGA, DUG is head gemmologist and president of CGL –GRS Swiss Canadian Gemlab Inc. in Vancouver. He is a research gemmologist with extensive experience in advanced testing of gemstones. 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 their Gem Identification department on coloured diamonds, coloured stones and pearls in New York. In 1998, he became Director of Gem Identification and Research for the EGL USA Group. Since 1999, he has focused on the HPHT process for changing the colour of diamonds and is considered an international HPHT expert. In 2001 he earned his Advanced Gemology Diploma (DUG) on subject “Identification of HPHT treated diamonds” from University of Nantes, France. Branko has conducted on-site research on gems and coloured diamonds in Sri Lanka, Russia, Brazil and Australia, and has managed many projects on natural, treated and synthetic diamonds. He has been a regular contributor to trade and gemmological magazines and presented

reports at a number of prestigious research conferences (Material Research, European Diamond, De Beers, Canadian Gemmological, GIT and GIA Gemological Conferences). The problems and challenges faced by gem testing laboratories in testing pearls and melee-sized colorless and colored diamonds Abstract: Testing laboratories around the world are supposed to provide a solution for all gem-related issues and problems. This task is extremely challenging, and even with the most sophisticated analytical instruments and the most experienced analyst or researcher there are issues that cannot be solved. Two of the most demanding procedures are involved in the testing of pearls and the analysis of colorless and colored melee diamonds. For pearls the most complicated and ambiguous topic are beadless saltwater cultured pearls: structurally such pearls can be extremely similar to natural pearls and in consequence the detection of such cultured pearls is not always easy. For diamonds the enormous quantities and the sometimes very small sizes (< 0.6 mm) of melee diamonds that should theoretically all be tested are the major drawback for laboratories; these stones must be very efficiently analyzed to identify synthetic diamonds, treated diamonds and imitations within such parcels. This presentation gives an overview of these problems and challenges and describes some of the solutions available for laboratories and gemologists.

CURRICULUM VITAE Dr. Thomas Hainschwang is managing director and researcher at the Liechtenstein branch of GGTL Laboratories in Balzers/Liechtenstein. He founded the GEMLAB (Liechtenstein) Laboratory in 1996 and worked from 2005 to 2007 as research Gemmologist for the GIA (Gemological Institute of America) - at the time in Geneva - with main responsibility in coloured diamond research.

From 2007 to 2011 he was working for GEMLAB (Liechtenstein) as the managing director of the lab. The two high-tech laboratories GEMLAB (Liechtenstein) and GemTechLab merged in March 2011 to form GGTL Laboratories. Dr. Hainschwang has developed and built many analytical research instruments in the past years, including different research grade systems for luminescence spectroscopy and imaging using various UV and laser excitations. He continues enhancing the capabilities of the analytical instruments at the laboratory with his inventions. He is a multidisciplinary gemmologist with specialization in diamond research and testing. He has published over 140 articles on various gem-related topics and has presented these topics in over 70 conferences around the world. Dr. Hainschwang holds a PhD in Physics (materials science) from the University of Nantes, France, that he obtained in May 2014 with his dissertation on “type Ib diamonds” Use of low-cost UV-NIR and Raman spectrometers in gem identification and diamond type screening

Abstract: The lecture will explain and demonstrate the use of advanced spectrometers and how they can become an effective and time saving gem identification tool.

The portable GL Gem Spectrometer developed by Gemlab Research & Technology helps to identify gemstones based on their spectral pattern and to analyze chromophores causing certain colours. It is also capable to detect irradiated diamonds and diamond types and among treatments whether green jadeite is naturally coloured.

The economically priced GL Gem Raman PL532 allows for rapid identification of gems and minerals using a comprehensive database; for the characterization of synthetic diamonds and HPHT treatments the PL option of the Raman spectrometer is of particular value.

CURRICULUM VITAE

J. Wolf Kuehn, B.A., M.A., Dipl.oec., F.G.A., F.G.G., Director of Education and CEO of the Canadian Institute of Gemmology (C.I.G.) started his education as gemmologist at the Institute for Gemstone Research in Idar-Oberstein while studying physics at the University of Freiburg, Germany. He is a professional member of the “British Columbia College of Teachers” and has taught various gemmology courses at Kwantlen Polytechnic University and since 2012 at the University of British Columbia, Vancouver.

Wolf has travelled extensively to over 50 countries on all continents and visited numerous gem mining areas; in 1996 he was invited as an official observer and consultant to the PLE (Parlement Lycéen Européen des écoles de bijouterie et métiers d’art) and as a speaker to conferences in Europe, South America and Asia. He has published and contributed to several books and is the webmaster of "Gemology World" - one of the first gemmology related websites on the internet.

In 2011 he became project manager for Gemlab Research & Technology (GLR&T) and works with research scientists in the development of advanced testing equipment such as the GL Gem Spectrometer and the GL Gem Raman PL532 system.

Appraising Antique Jewelry Abstract: The valuing elements of antique jewelry is a direct correlation to the appropriate gemstones and the integrity of the era, styles and motifs. Never can one value antique jewelry based on the cost of the elements. The process is dependent on selecting the right comparables.

CURRICULUM VITAE

Gail Brett Levine, GG, independent personal property appraiser, has been in the jewelry trade for over 30 years. Initially starting as the owner of an antique shop in Alexandria, VA,

Presidential Antiques Co., Inc., she specialized in antique, period and estate jewelry. She received her GG in residence from GIA (NY) in 1980 and currently serves on the Executive Council of the GIA Alumni Association and the Association for the Study of Jewelry and Related Arts. She is a former board member of the American Society of Jewelry Historians, Past President of the Board of Directors of the International Society of Appraisers, 1996 - 1998, and served on its Board for five years. Currently, she is the Executive Director of The National Association of Jewelry Appraisers, the largest gem and jewelry appraisal organization in the United States.

Ms. Levine is also President of Timeless, Inc. (1982 to present) specializing in insurance, estate, and donation appraisals of antique, estate and contemporary jewelry, precious metals and loose diamonds and colored stones and gem consulting.

In 1994, she started the subscription based publication Auction Market Resource for Gems and Jewelry which is an indepth report by qualified appraiser/gemologists of sales results of jewelry at auction which previews gem material. In 2005 Auction Market Resource ceased publications to become totally on the internet. It is currently recommended by most appraisal organizations.