38th IGC 2025 Athens, Greece

Location: Athens Chamber of Commerce and Industry

8:30 - 9:30 Registration at ACCI (6th floor)
9:30 - 9:35 IGC Opening (Greek representatives)
9:35 - 9:50 IGC history (Dr. Jayshree Panjikar - IGC Executive secretary)
9:50 - 10:30 Coffee Break - Outside Conference Room Area
Open Session: Gemmology and Greece
10:30 - 10:55 P. Voudouris, S. Karampelas, V. Melfos: Gems in Greece: Geology, mineralogy and crystallizing environment
10:55 - 11:10 M. Nikopoulou, S. Karampelas, E. TsangarakI, L. Papadopoulou, C. Katsifas, I. Nazlis, V. Melfos, N. Kantiranis: Gems in Hellenistic and Roman Jewellery of Northern Greece: An investigation from the Collections of the Archaeological Museum of Thessaloniki, Greece
11:10 - 11:25 I. Alexandris: A Regal legacy: Jewels and gems of Greece’s royal and prominent personalities
11:25 - 11:40 A. Sergoulopoulos: Gemmological education in Greece
11:40 - 12:00 A. Krikos, I. Papadopoulos: Glyptography in Greece
12:00 - 13:30 Lunch Break - Outside Conference Room Area
Executive Committee meeting

Session 1: History and Museums - Chairperson: Karen Fox

13:30 - 13:50 E. Gaillou, G.A. Farfan G.A., U.F.S. D’Haenens-Johansson, S. Persaud, R.C. Feather II, W.H. Towbin, D.C. Jones: Studying renowned fancy color diamonds in museum collections: The case of the Winston Red
13:50 - 14:10 K. Schmetzer: History of Garnet Mining and Cutting in the Austro-Hungarian Monarchy
14:10 - 14:30 M.-L. Cassius-Duranton, V. Pardieu, S. Karampelas: Historic Emeralds and their Geographic Origin: A Retrospective Study
14:30 - 14:50 S. Karampelas, E. Gaillou, A. Herrewegh, U. Hennebois, F. Maouche, R. Bolzoni, S. Riou, Q. Dartois, B. M. S. Beuve, C. Gliksman, T. Magalhaes, V. Demetz, A. Delaunay: Study of “amethysts” from the French Crown Jewels
14:50 - 15:10 B. Shirdam, Y. Mingxing, A. H. Shen, H. F. Nashli: Cross-Cultural Provenance and Characterization of Turquoise Artefacts: A Multi-Analytical Non-Destructive Study of Reshui Tomb Cluster, China (744 AD) and Tepeh Zagheh, Iran (5200–4200 BCE)
15:10 - 15:40 Coffee Break - Outside Conference Room Area

Session 2: Pearls and Amber - Chairperson: Dr. Michael Krzemnicki

15:40 - 16:00 Y. Li, Q. Su: Unravelling the luminescence spectrum of novel ceramic nucleus cultured pearl and the cause of its strong luster
16:00 - 16:20 N. R. Hansen: Modern Cultivation of Freshwater Pearls in China: Advances in Materials, Technique
16:20 - 16:40 A. Costanzo, A. Klikowicz-Kosior, M. Kosior: Amber and its treatments: A New Baltic Amber Classification Chart
16:40 - 17:00 T. N. Thet, T. S. Tay, L. Soe, L. Cheyenne, H. Y. Loke: Amber from the Thanbaya Gaing Coal Mine, Minbu Township, Magwe Region, Myanmar
17:00 - 17:20 N. Renfro: A Photo Survey of Inclusions in Fossiliferous Amber
19:30 Cocktail at the restaurant of Benaki Museum of Greek culture

Location: Athens Chamber of Commerce and Industry

Session 3: Gemmology 1 - Chairperson: Dr. Ahmadjan Abduriyim

9:30 - 9:50 M. Vigier, H. Evans, G.R. Rossman, S. Jobic, E. Fritsch: Fe-Ti charge transfers: A comprehensive review and its applications to minerals and gems

9:50 - 10:10 U. Henn: Application of Fibre Optics Reflectance Spectroscopy (FORS) for the determination of mineral pigments in jasper

10:10 - 10:30 M. F. Hügi, M.S. Krzemnicki, M. Wälle: Gem-quality pink fluorite from Planggenstock, Switzerland: chemical and physical properties and a comparison with pink fluorites from other localities
10:30 - 11:00 Coffee Break - Outside Conference Room Area

Session 4: Gemmology 2 - Chairperson: Dr. Karl Schmetzer

11:00 - 11:20 C. Schwarzinger, S. Ulatowski, G. R. Rossman: Zoisite and its many colors
11:20 - 11:40 L. Gilles-Guéry: Pink-orange gem quality euclase from Bahia, Brazil
11:40 - 12:00 K. E. Fox, A.M. McDonald, C. Yakymcuk: On the nature of blue rose quartz
12:00 - 13:00 Lunch Break - Outside Conference Room Area
Executive Committee meeting

Session 5: Gemmology 3 - Chairperson: Dr. Pornsawat Wathanakul

13:00 - 13:20 A.Y. Shelementyeva, Y.B. Shelementyeve, O.V. Yarapova: Typomorphic features of tourmalines of the Malkhan pegmatite field from the Irkutyanaka vein
13:20 - 13:40 J. M. Saul: Colored gemstones of metamorphic origin: Progress report in understanding how they crystallize at depth in East Africa, the Hindu Kush, Pamir Mountains, and the Middle-Urals Ring Structure
13:40 - 14:00 J. Panjikar, A. Panjikar: Hessonite garnet from Angul district of Odisha, India
14:00 - 14:20 D. Gravier, A. Delaunay, J. Boemo, J.-M. Arlabosse, E. Fritsch, S. Karampelas: Hurlbutite from Myanmar
14:20 - 14:40 G. Choudhary: A convincing glass imitation of larimar (pectolite)
14:40 - 15:10 Coffee Break - Outside Conference Room Area

Session 6: Gemmology 4 - Chairperson: Prof. Dr. Stefanos Karampelas

15:10 - 15:30 S.F. McClure: Bertrandite in Emeralds
15:30 - 15:50 R.A. Schultz-Güttler, A.R. Borotti, I.P. Marques, A. L. S. Pestilho: Found, Lost, and Found Again: The Geological and Gemological Significance of the Salininha Emerald Deposit, Brazil
15:50 - 16:10 T. Sripoonjan, M. Seneewong-Na-Ayutthaya, S. Saengdech, S. Singbamroong, A. Fanka: Automated Data Processing of Raman Spectra for Supporting Spinel Origin Determination
16:10 - 16:30 G. Zoysa, D. Schwarz, A. Kleismantas: Spinel from Sri Lanka - An update
16:30 - 16:50 B. Laurs: The Importance and Methodology of Undertaking a Literature Search for Gemmological Research and Article Publishing
16:50 - 17:10 J. Garcia-Toloza, R. J. David, O. Cristian, C. C. Julio: An approach to understanding the factors in the emerald enhancement clarity grading system used at CDTECGemlab

19:30 Folk night - Acropol Restaurant

8:00 - 19:00 Excursion to the Lavrion Mines and Cape Sounion
14:30 Group photo in front of the Mineralogical Museum of Lavrion

Free evening

Location: Athens Chamber of Commerce and Industry

Session 7: Corundum 1 - Chairperson: Dr. Ulrich Henn

9:30 - 9:50 B. Chauviré, M. Corre, M. Curti, C. Gautheron, S. Figowy, L. Pinsault: Noble gas in corundum: interests in gemology
9:50 - 10:10 A. Abduriyim, F. L. Sutherland, T. Coldham, E. Belousova: Gem zircon and sapphire age dating and application of origin determination: A study from New England sapphire fields, New South Wales, Australia
10:10 - 10:30 M. Seneewong-Na-Ayutthaya, B. Wanthanachaisaeng, T. Leelawatanasuk, W. Atichat, S. Saengdech, P. Kamkaew, T. Sripoonjan: Geographic Origin Determination of Natural Yellow Sapphires: The Preliminary Study
10:30 - 11:00 Coffee Break - Outside Conference Room Area

Session 8: Corundum 2 - Chairperson: Dr. Jayshree Panjikar

11:00 - 11:20 V. Pardieu: Rubies from Greenland
11:20 - 11:40 M. Furuya: Blue sapphire from Malacacheta of Minus Gerais, Brazil
11:40 - 12:00 S. Singbamroong, T. Sripoonjan, M. Seneewong Na Ayutthaya, P. Piantumdee, T. Sutipanya, K. Hussein, N. Ahmed: Gemological Characteristics of New Transparent Brown Sapphire
12:00 - 13:00 Lunch Break - Outside Conference Room Area
Executive Committee meeting

Session 9: Corundum 3 - Chairperson: Shane Mcclure

13:00 - 13:20 M.S. Krzemnicki, W. Zhou, P. Lefèvre, M. Wälle, H.A.O. Wang: HFSE-enriched sapphires of gem quality: A combined FTIR and trace element study and implications for heat treatment detection
13:20 - 13:40 E.B. Hughes, R. Perkins: Low Temperature Heat Treatment of Madagascar Sapphire
13:40 - 14:00 H.A.O. Wang, M. Wälle, V. Hutanu, X. Li, M. S. Krzemnicki: Effects of Gamma Irradiation on Corundum: Towards a Potential Detection Method
14:00 - 14:20 S. Promwongnan, W. Atichat, C. Suphan, W. Chongraktrakul, V. Pisutha-Arnond: Challenges in the Detection of Ruby and Sapphire Treatment in the Thai Market
14:20 - 14:40 S. Kennedy: Padparadscha sapphires and heat treatment
14:40 - 15:10 Coffee Break - Outside Conference Room Area

Session 10: Jade - Chairperson: Thye Sun Tay

15:10 - 15:30 S.-I (Edward) Liu, K.-Y. (Angela) Man, M. Seneewong-Na-Ayutthaya, B. Wanthanachaisaeng: Advancing Fei Cui Origin Authentication: A comparison of green Fei Cui from Myanmar, Guatemala, Italy and Russia
15:30 - 15:50 E. Su: Color Genesis Analysis and Characteristics for Origin Identification of Purple Jadeite
15:50 - 16:10 M. Seneewong-Na-Ayutthaya, B. Wanthanachaisaeng, T. Lhuaamporn, W. Suwanmanee, W. Atichat, T. Leelawatanasuk: Dyed purple Fei Cui (Lavender jade) from Mandalay’s jade market, Myanmar

19:30 Gala Dinner – Attikos Restaurant

Location: Athens Chamber of Commerce and Industry

9:00 - 9:30 Coffee – Outside Conference Room Area

Session 11: Diamonds - Chairperson: Prof. Dr. Emmanuel Fritsch

9:30 - 9:50 T. Hainschwang: Pink to Red and Violet Diamonds from the Argyle Mine, Australia: Properties, Color Origin and Latest Research Results
9:50 - 10:10 M. Bouman, J. Zarupski: Shining light on “480 nm band” diamonds: Gemmological characteristics of an unusual group of diamonds with yellow and red luminescence
10:10 - 10:30 K. Emori, H. Kitawaki, M. Hisanaga, M. Yamamoto: Identification of melee size synthetic coloured diamond for jewellery
10:30 - 10:50 Y. Shelementyev, G. Kriulina, O. Yarapova, V. Vins, A. Stolyarevich: Nitrogen aggregates in yellow HPHT and CVD synthetic diamonds
10:50 - 11:10 H. Y. Loke, L. C. H. Timothy, H. Nyunt, T. N. Thet, S. Linda, T. S. Tay: Diamonds from Than Lwin River near Mong Hsu, Myanmar
11:10 - 11:30 S. Sakkaraevj, T. Lhuaamporn, P. Lomthong, W. Atichat, P. Wathanakul: Morphologies and Surface Features of Diamond Samples from Southern Thailand

11:30 - 12:30 Lunch Break - Outside Conference Room Area Executive Committee meeting

12:30 - 13:30 Announcements for IGC 2027 - Closing IGC 2025