35th IGC 2017 Windhoek, Namibia

8.00 – 8.45 Executive Committee (EXECO) Meeting, Flamingo Room No. 2, Safari Hotel

Session 3 Corundum – Chairman: Karl Schmetzer

9.00 – 9.20 Terrence Coldham: An Examination of the Morphology of Grains of Crystalline Corundum from Lava Plains Northern Queensland; A Rare Example of an “in situ” Pyroclastic Sapphire Deposit

9.20 – 9.40 Franck Notari, Emmanuel Fritsch, Candice Caplan, Thomas Hainschwang: Are Boehmite Needles in Corundum Rose Channels?

9.40 – 10.00 Shane F. McClure: Sapphire Mining in Montana

10.00 – 10.20 W. Atichat, J. Jakkawanvibul, M. Maneekrajangsaeng, T. Sripoonjan, T. Leelawatanasuk, V. Pisutha-Arnond, N. Narudeesombat, P. Chanthayod, B. Sriprasert: Padparadscha Color Grading for Gem Trade

10.20 – 11.10 Coffee Break

Session 4 Diamond – Chairman: Emmanuel Fritsch

11.10 – 11.30 Hiroshi Kitawaki, Kentaro Emori, Mio Hisanaga, Masahiro Yamamoto: Two Kinds of Synthetic Diamonds Having Features Similar to Natural Diamonds

11.30 – 11.50 R. Serov, Y. Shelementiev, A. Serova: Hybrid Diamonds: Natural Diamonds Overgrown with CVD Synthetic

11.50 – 12.10 Rainer Schultz-Güttler: Skins, Stains, Spots and Ruts: Green Diamonds from Brazil

12.10 – 12.30 Andy H. Shen, Tay Thye Sun, Ye Luo, J.T. van Gorsel, Mega Rosana Fatimah, Tay Kunming, Wilyanto Deng: Kalimantan Diamonds from Landak: Gemmological Characteristics, FTIR and Photoluminescence Spectroscopy

12.30 - 14.00 Lunch at Welwitschia Restaurant, Safari Hotel

14.00 - 17.00 Poster Session Exhibition and sale of Namibian minerals and gemstones by small-scale miners, gemstone auction, Namibian jewellery exhibition Organized by Industry Growth Strategy (IGS) for the Gemstone and Jewellery Industry of Namibia

18.30 – 22.00 Dinner at Joe’s Beerhouse, Windhoek

Session 5 Spinel, Tourmaline, Garnet – Chairman: Gamini Zoysa

9.00 – 9.20 Jayshree Panjikar, Aatish Panjikar: Study and Investigation of Spinel from Kermunda in Odisha, India

9.20 – 9.40 Cheng-Si Wang, Andy H. Shen: Reversibility of Photoluminescence Spectra of Spinel with Heat Treatment

9.40 – 10.00 Claudio C. Milisenda, Stefan Müller: REE Photoluminescence in Paraìba Type Tourmaline from Mozambique

10.00 – 10.20 Karl Schmetzer, H. Albert Gilg, Ulrich Schüssler, Jayshree Panjikar: Origin Determination of Garnets: Search for Historical Trade Routes

10.20 – 11.10 Coffee Break

Session 6 Corundum – Chairlady: Willow Wight

11.10 – 11.30 J.C. (Hanco) Zwaan, Leo M. Kriegsman, Jorien L.N. van der Wal, Richard J.M. Taylor, E. Gamini Zoysa: Characterization and Formation of ‘Metamorphic’ Sapphires – Examples from Sri Lanka

11.30 – 11.50 E. Zoysa Gamini, Liu Shang I, Edward, Arūnas Kleišmantas: Preliminary Report on New Corundum Deposits of Sri Lanka

11.50 – 12.10 Sutas Singbamroong, Aisha Rashid Almazrooei, Nazar Ahmed: Lead Glass-Filled Padparadscha

12.10 – 12.30 Seung Kwon Lee, Kiran Kwon: Raman Study for Heat-Treated Sapphires Based on the Structural Relaxation by Impurities and Thermal Energy

12.30 - 14.00 Lunch at Welwitschia Restaurant, Safari Hotel

Session 7 Investigation Techniques – Chairman: Hanco Zwaan

14.00 – 14.20 Michael. S. Krzemnicki, Hao A. O. Wang, Walter A. Balmer, Jean-Pierre Chalain, Pierre Lefèvre, Wei Zhou, and Laurent Cartier, Henry A. Hänni: GemTOF: A New and Highly Versatile Method to Analyse Trace Elements and Isotopes of Gemstones and Pearls

14.20 – 14.40 Kentaro Emori, Hiroshi Kitawaki: Identification of Natural and Synthetic Amethyst Using Multivariate Analysis

14.40 – 15.00 Masaki Furuya: The Efficiency and Limitation of the Phosphorescence Imaging for Screening Current Melee Sized Synthetic Diamonds

15.00 – 15.20 Bahareh Shirdam, Soheila Aslani: Origin determination of Iran Excellent-Quality Turquoise Based on Trace Element Analysis Using ICP-MS and Micro XRF 35th IGC 2017 – Windhoek, Namibia 11 C

15.20 – 15.50 Coffee Break 15.50 Poster Session 19.00 – 22.00 Gala Dinner at Omatako Room 2, Safari Court Conference Centre

Session 8 Pearls and Amber – Chairman: Tay Thye Sun

9.00 – 9.20 Nick Sturman, Areeya Manustrong, Kwanruen Lawanwong, Promlikit Kessrapong, Nanthaporn Somsa-ard, Artitaya Homkrajae: “Golden” Pinctada Maxima Non-Bead Cultured Pearls with an Emphasis on their Internal Structures

9.20 – 9.40 Stefanos Karampelas, Abeer Tawfeeq Al-Alawi, Ali Al-Attawi, Kenneth Scarratt: Natural Pearls Found from Pinctada Radiata in the Kingdom of Bahrain: Characteristic Structures, Comparison and Identification

9.40 – 10.00 Elisabeth Strack: Past and Present Situation of Freshwater Pearls from North Western Russia

10.00 – 10.20 Liu Shang I, Edward: Feather and Insect Inclusions in Burmese Amber and its Impact on Origin Determination

10.20 – 10.50 Coffee Break

Session 9 Miscellaneous – Chairman: John Saul

11.10 – 11.30 Willow Wight: Ammolite, Canada’s Unique Fossil Gemstone

11.30 – 11.50 Anette Juul-Nielsen, Arent Heilmann: A Gemstone Occurrence Map for Greenland

11.50 – 12.10 Stephen Kennedy, Jens Najorka: Imitations of Tianhuang and Shoushan sSones

12.10 – 12.30 Çiğdem Lüle: Gemological Terminology issues: An Ongoing Battle…

12.30 - 14.00 Lunch at Welwitschia Restaurant, Safari Hotel Session 10 Beryl, Cordierite, Jade – Chairman: Ulrich Henn

14.00 – 14.20 Klaus Schollenbruch, Lore Kiefert, Klemens Link, Tewodros Sintayehu: Gem Quality Emeralds from Ethiopia

14.20 – 14.40 Karen E. Fox, Chris Yakymchuk: Canadian Gem-Grade Cordierite

14.40 – 15.00 Ahmadjan Abduriyim, Kazuko Saruwatari, Yusuke Katsurada: Jadeite Jade from Japan: Its History, Gemmology and Comparison with Jadeite from other Sources

15.00 – 15.40 Coffee Break

15.40 – 16.40 Closing Ceremony, Namib Room 1, Safari Hotel

19.00 – 21.00 Buffet Dinner at Acacia Restaurant, Safari Court Hotel