36th IGC 2019 Nantes, France

27. Aug 31. Aug. 2019

IGC 2019: Nantes, France

Dear colleagues of IGC,

It was our great pleasure and pride to welcome you to the 36th International Gemmological Conference in Nantes, France. Nantes has progressively gained a reputation in the science of gemmology since Prof. Bernard Lasnier created the Diplôme d’Université de Gemmologie (DUG) in the early 1980s. Several DUGs or PhDs have since made a name for themselves in international gemmology. In addition, the town of Nantes has been on several occasions recognized as a very attractive, green town, with a high quality of life. This regional capital is also an important hub for the industry (e.g. agriculture, aeronautics), education and high-tech. It has only recently developed tourism even if has much to offer, with its historical downtown, the beginning of the Loire river estuary, and the ocean close by.

The organizers of 36th International Gemmological Conference thank you for attending this interesting conference.

Dr. Emmanuel Fritsch, Dr. Nathalie Barreau, Féodor Blumentritt MsC.

The organizers of the 36th International Gemmological Conference in Nantes, France From left to right Dr. Emmanuel Fritsch, Dr. Nathalie Barreau, Féodor Blumentritt MsC.


La Cité Nantes Congress Center
Nantes (France)

Wednesday 28th August

Session 1: Diamonds. Chairman: Henry Hänni

11:20 - 11:40 Lucille Daver, Hélène Bureau, Éloïse Gaillou, Benoit Baptiste, Oulfa Belhadj, Églantine Boulard, Nicolas Guignot, Eddy Foy, Pierre Cartigny and Daniele L. Pinti: The genesis of lithospheric blue diamonds.

11:40 - 12: 00 Marie Schoor, Jean-Claude Boulliard, Emmanuel Fritsch, Eloïse Gaillou, Benjamin Rondeau : characterization of growth sectors in asteriated diamonds

12:00 - 12:20 Roman Serov, Sergey Sivovolenko: Fluorescence influence on diamond performance

12:20 – 12.40 Aurélien Delaunay, Emmanuel Fritsch, Annabelle Herreweghe: Proposed classification of type IIa diamonds on the basis of the DiamondView image

12: 40 – 14:00 Lunch in the multipurpose area R0

Session 2 Synthetic & treated diamonds. Chairman: Emmanuel Fritsch

14:00 – 14:20 Hiroshi Kitawaki, Kentaro Emori, Mio Hisanaga, Masahiro Yamamoto: Current Production of Synthetic Diamond Manufacturers in Asia.

14:20 – 14:40 Tian Shao, Jinqiu Zhang, Andy Histien Shen : Phosphorescence of type IIb HT-HP synthetic diamonds from China.

14:40 – 15:00 Jean-Pierre Chalain, Ly Phan, Michael S. Krzemnicki, Hao Wang, Jörg Pausch, Michael Steinacher: Study of a recut HPHT synthetic diamond: colour vs size vs SWUV transmission

15:00 – 15:20 Thomas Hainschwang, Gianna Pamies: The effects of HPHT treatment on previously irradiated and annealed diamonds of all types and colors

15:20 –16:00 Coffee breaks and posters

Session 3 History and age dating Chairlady: Jayshree Panjikar

16:00 – 16:20 H. Albert Gilg, Ulrich Schüssler, Joachim Krause, Bernhard Schulz : The use phosphate inclusions in origin determination of ancient and medieval red garnet.

16:20 - 16:40 Karl Schmetzer, H. Albert Gilg: A gothic crown in the treasury of the Munich residence museum : examination of the English royal insignia from the late Middle-age.

16:40 - 17:00 Michael S. Krzemnicki, Hao A.O. Wang, Myint M. Phyo: Age dating applied as testing procedure to gemstones and biogenic materials

17:00 -17:20 Elisabeth Strack , Bernd Augustin : gemmological examination of four Mogul jewellery objects daing from the first half of the 17th century.

19:00 Diner at “La Cigale” restaurant, a historical monument in the center of Nantes

Thursday 29th August

9:00 – 12:00 Visit of the “Machines de l’Ile” an ensemble of articulated machines inspired by Jules Verne.

12: 40– 14:00 Lunch in the multi-purpose area R0

Session 4 Colored stones 1- Chairlady: Willow Wight

14:00 – 14:20 Carolina Santiago and Jurgen Schnellrath : Cat’s eye opal from Brazil: A second look.

14:20 – 14:40 Alessandra Costanzo , Martin Feely: Review gem-materials from Connemara, Western Ireland.

14:40 – 15:00 Cho Cho, Thet Tin Nyunt , Tay Thye Sun and Tin Kyaw Than: jadeitite deposit from Khamti, Sagaing region, Myanmar

15:00 – 15:20 Gamini Zoyza, Pantaree Lomthong, Dietmar Schwarz, Chen Yanyu, Arūnas Kleišmantas: Spinels from Sri-Lanka.

15:20 – 15:40 Shengsi Wang, Andy Shen, Aaron Palke, Peter Heaney : Color origin of the Oregon sunstone – The reabsorption on exsolution of Cu inclusions.

15:40 – 16:20 Coffee breaks and posters

Session 5 Colored stones 2 – Chairman Gamini Zoysa

16:20 - 16:40 Feodor Blumentritt, Emmanuel Fritsch, Maria Teresa Caldes, Stephane Jobic: Introduction to mine ralomimetism : the case of photochromic sodalite hackmanite

16:40 - 17:00 Peter Lyckberg, Vsevolod Chournousenko, Oleksandr Chournousenko : Giant heliodor and topaz pocket of the Volodarsk-Volinsky chamber pegmatites, Korosten pluton, Ukraine.

17:00 -17:20 Gagan Choudhary: Recent challenges in identification of filled emeralds

17:20 – 17:40 Shang I (Edward) Liu, Kyaw Thu, Hexiong Yang: A study of pezzotaite from Pyi-Gyi-Taung, Myanmar.

17:40–18:00 Tasnara Sripoonjan , Montira Seneewong Na Ayutthaya , Pimtida Bupparenoo , Nalin Narudeesombat , Thanong Leelawatanasuk , and Malin Sawatekitithum : Gemological and chemical characteristics of Yiqisong peridot, Jilin, People Republic of China.

19:15 Transportation from Cité des Congrés 20:00 Gala dinner along the Erdre river on a boat- restaurant from “ les bateaux de l’Erdre”

Friday 30th August

Session 6 Colored Stones 3 Chairman: Thye Sun Tay

9:00 – 9:20 Pignatelli Isabella, Giuliani Gaston, Morlot Christophe, Pham Van Long: Trapiche texture in emeralds and rubies

9:20 – 9:40 Jarolsav Hyrsl : Genetic classification of mineral inclusion in quartz

9:40 – 10:00 Willow Wight, Aaron J. Lussier and T.S. Ercit : Canadian gem tourmaline and the Leduc mine.

10:00 – 10:20 Hänni, H.A., Milisenda, C., Wang, H.A.O.: Tourmaline with Coltan ore inclusions – an example of auto-irradiation

10:20 – 10:40 Lutz Nasdala, Manfred Wildner, Doris Blaimauer , Manuela Zeug , Chutimun Chanmuang N. , E. Gamini Zoysa : Ekanite from Sri-Lanka : what can we learn from a radioactive gemstone ?

10:40 – 11:20 Coffee breaks and posters

Session 7 Corundum 1: Chairman Claudio Milisenda

11:20 - 11:40 Rainer Schultz-Guttler, Bruno Zampaulo: unusual corundum (ruby) bearing rocks from Brazil and India

11:40 – 12:00 Jayshree Panjikar, Aatish Panjikar: Investigation of ruby from a new occurrence from Paramathi in Karur district of Tamil Nadu, India.

12:00 – 12:20 Wilawan Atichat, Supparat Promwongnan, Saengthip Saengbuangamlam, Visut Pisutha-Arnond, Thanong Leelawatanasuk, Marisa Maneekrajangsaeng, Jirapit Jakkawanvibul, Pornsawat Watha nakul, Nalin Narudeesombat, Pimtida Bupparenoo, Apitchaya Buathong. Review of Rubies and sap phires from Chantaburi – Trat and Kanchanburi gems field, Thaïland.

12:20 – 12:40 Stephen Kennedy Review of iron and titanium diffusion treated synthetic sapphire

12: 40 – 14:00 Lunch in the multi-purpose area R0

Session 8 Corundum 2 : Chairman Michael Krzemnicki

14:00 – 14:20 Kentaro Emori, Hiroshi Kitawaki , Akira Miyake : Be-containing nano-inclusions in untreated blue sapphire from Diego, Madagascar.

14:20 – 14:40 Wiwat Wongkokua , Natthapong Monarumit, Aumaparn Phlayraharn, Somruedee Satitkune, Pornsawat Wathanakul: Update of Fe and Ti oxidation states in ruby and blue sapphire.

14:40 – 15:00 Tom Stephan, Claudio C.Milisanda, Angunguka TH.Jepsun: Low temperature and flux assisted heat treatment of rubies and pink sapphires from Mozambique and Greenland.

15:00 – 15:20 Sutas Singbamroong, Panjawan Thanasutthipitak, Thawatchai Somjaineuk, Nirawat Thammajak, Chatree Saiyasombat, Nazar Ahmed, Phisit Limtrakun: Beryllium heat-treated blue sapphire from Sri-Lanka.

15:20 – 16:00 Coffee break and posters

Session 9 Corundum 3 Chairman Karl Schmetzer

16:00 - 16:20 Thanong Leelawattanasuk, Thanapong Lhuaamporn, Papawarin Ounorn, Budsabakorn Srisataporn and Nattapat Karava: Blue sapphires heated with pressure and effect of low temperature annealing on the OH-related structure.

16:20 - 16:40 Wasura Soonthorntantikul, Sudarat Saeseaw, Shane McClure, Ungkhana Atikarnsakul, Charuwan Khowpong, Suwasan Wongchacree, Jonathan Muyal: An examination of sapphires treated with heat and pressure before and after treatment.

16:40 - 17:00 Martial Bonnet, Emmanuel Fritsch: Little known absorption bands in infrared spectra of corundum: what do they mean? Free evening Suggestion: The Fetes de l’Erdre, a jazz and historic boat festival will take place along the Erdre river

Saturday 31st August

Session 10 Pearls and amber. Chairlady Pornsawat Wathanakul

9:20 – 9:40 Bahareh Shirdam, Andy H. Shen, Soheila Aslani, Zhiqing Zhang: Persian amber: A Myth or Reality ?

9:40 – 10:00 Laurent E. Cartier, Michael S. Krzemnicki, Bertalan Lendvay, Nadja Morf, Joana B. Meyer: DNA finger printing of precious corals on pearls.

10:00 – 10:20 Stefanos Karampelas, Fatima Mohamed, Hasan Abdulla, Abeer Al-Alawi: New insights on X-ray luminescence of natural on cultured pearls from fresh waters and salt water bivalves.

10:20 – 10:40 Abeer Al-Alawi, Zainab Ali, Fatema Albedal, Stefanos Karampelas: Pinctata radiata saltwater cultured pearls from Abu Dhabi (U.A.E.)

10:40 – 11:20 Coffee breaks and posters

Session 11 General gemmology 1 Chairlady Wilawan Atichat

11:20 - 11:40 Anette Juul-Nielsen, Hans Lange: Greenlandic ivory: past and present use

11:40 – 12:00 Ahmadjian Abduriyim: Update of worldwide gemstone discovery activities after 2000

12:00 – 12:20 Brendan M. Laurs: Writing scholarly gems locality articles : perspectives from geologist, gemmologist, and editor.

12:20 – 12:40 Hao A.O. Wang, Michael S. Krzemnicki, Susanne Büche, Ramon Schmid, Judith Braun: Multi-element analysis of gemstones and its application in geographical origin and determination

12: 40 – 14:00 Lunch in the multi-purpose area RO

Session 12 General gemmology 2 Chairman Stefanos Karampelas

14:00 – 14:20 Menahem Sevdermish: Exploring gem commercial names using big data color analysis technology, expert traders’ opinions and geographical and trade interpretation.

14:20 – 14:40 Lore Kiefert, Klaus Schollenbruch: Laser damage in gemstones caused by jewelry repair laser.

14:40 – 15:00 Tom Stephan, Tobias Häger , Ulrich Henn, Wolfgang Hofmeister : Spectral fitting of UV/Vis/NIR, spectra for the quantitative determination of Cr3+ and V3+ in gemstones, with special emphasis on ruby and emerald.

15:00 – 15:20 Martine Philippe, Emmanuel Fritsch : Dissolved dislocations in gems : an overview.

15:20 – 16:00 Coffee break

16:00 - 17:00 Closing ceremony


  • Gagan Choudhary, Sandeep Vijay: A review of commercially available turquoise imitations
  • Claude Drouin, Emmanuel Fritsch: A history of gem-quality cubic zirconia
  • Karen Fox, Kenneth Fox: Gemmological applications of Arduino
  • Seung Kwon Lee, Randy Luo: Optical properties of hackmanite ad sodalite
  • Zemin Luo, Mingxing Yang, Qin Fang, Ren Lu, Luwu Cai, Yang Hu: provenance of emerald from Prince Liangzhuang’s tomb in Ming dynasty, Hubei, China.
  • Nalin Narudeesombat, Namrawee Susawee, Pimtida Bupparenoo, Apitchaya Buathong, Supparat Promwongnan and Thanong Leelawatanasuk,: Characteristics of Tairus synthetic hydrothermal ruby and blue sapphire
  • Thet Tin Nyunt, Thye Sun Tay : Amber from Khamti, Sagaing region, Myanmar
  • Chen Quanli, Liu Xianyu: Turquoise from Zhushan county in Hubei province of China
  • Elizabeth Su: The vivid world of jadeite
  • Manuela Zeug, Lutz Nasdala, Radek Škoda, Chutimun Chanmuang N., Martin Ende, Christoph Hauzenberger, Dan Topa, Manfred Wildner, Richard Wirth: Mineralogical characterization of the unusual gemstone parisite-(Ce)
  • Zhiqing Zhang, Andy H. Shen: Amber with violet fluorescence from Myanmar.