36th IGC 2019 Nantes, France

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

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”

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

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