IGC 2021 Online

12:00 Start of Session by Zoom Convenor (Michael S. Krzemnicki), short explanation of general rules of zoom session

12:05 - 12:15 Welcome Address by Jayshree Panjikar (Executive Secretary of IGC Executive Committee)

Start of first session: Diamonds

12:15 - 12:30 Tian Shao & Andy Shen: Progress on the study of Irradiated Vacancy Quenching Phosphorescence in HPHT Synthetic IIb Diamond

12:30 - 12:45 John Chapman: Analysis of yellow luminescing diamonds

12:45 - 13:00 J.-P. Chalain: Preliminary study of defocussed PL measurements

13:00 - 13:15 Jayshree Panjikar: Study of inclusions and types in an antique diamond ornament

13:15 - 13:30 Stefanos Karampelas: Gemmological and Spectroscopic Study with Mobile Instruments of The «Emeralds» from The French Crown Jewels

13:30 - 13:35 Short break (also for additional questions, remarks)

Start of second session: Corundum

13:35 - 13:50 Supparat Promwongnan: The chemical fingerprints of Ruby and Sapphire from Trat-Chanthaburi Gem Field, Eastern Thailand

13:50 - 14:05 Michael S. Krzemnicki: Zircon inclusions in unheated pink sapphires from Ilakaka, Madagascar: A Raman spectroscopic study

14:05 - 14:20 Sudarat Saeseaw: Effect of low-temperature heat treatment on sapphires: Inclusions and FTIR spectroscopy

14:20 - 14:35 Pornsawat Wathanakul: Detection of natural colour centre in yellow sapphire samples by UV-VisNIR excitation spectroscopy

14:35 - 14:50 Emmanuel Fritsch: Exploring the cause of orange luminescence in corundum

14:50 - 15:05 Nathan Renfro: The Micro-World of Sapphire from Secondary Sources in Montana, USA

15:05 - 15:15 Concluding remarks of 1st Day by Zoom Convenor Michael S. Krzemnicki and Jayshree Panjikar (Executive Secretary of IGC Executive Committee)

15:15 - 15:30 Option: Open session for discussions/remarks

12:00 Start of Session by Zoom Convenor (Dr Hao Wang), short explanation of general rules of zoom session

12:05 - 12:10 Short Welcome Address by Jayshree Panjikar (Executive Secretary of IGC Executive Committee)

Start of third session: Other Gems

12:15 - 12:30 Qingchao Zhou & Andy Shen: The Fluorescence Characteristics and Identification of Copper Diffusion-Treated Red Feldspar

12:30 - 12:45 Lutz Nasdala: Luminescence of gem topaz from Schneckenstein, Germany

12:45 - 13:00 Tom Stephan: Colour mechanisms and heat treatment of blue Nigerian gahnites

13:00 - 13:15 Masaki Furuya: The colouring agent of pink jadeite

13:15 - 13:30 Claudio C. Milisenda: Comparative characteristics of gem-quality diaspore from Afghanistan and Myanmar

13:30 - 13:45 Hao A.O. Wang: Cu-containing Thin Sheet Inclusion in Cu-bearing Tourmaline from Brazil

13:45 - 14:00 Shang I (Edward) Liu: Trapiche-Skeleton Quartz from Inner Mongolia: Crystal Morphology, Internal Features and Possible Formation

14:00 - 14:15 Bahareh Shirdam: Persian Turquoise; A review on the current state of Neyshabur turquoise mine, Iran

14:15 - 14:30 Gamini Zoysa: New giant gem corundum boulder from Sri Lanka

14:30 - 14:35 Short break (also for additional questions, remarks)

Start of fourth session: Pearls

14:35 - 14:50 Tay Thye Sun: Myanmar Gold-Lipped Cultured Pearls

14:50 - 15:05 Chaoyang Chen & Andy Shen: Progress in studying pigment evolution during the growth of freshwater cultured pearls

15:05 - 15:15 Kentaro Emori Analysis of Japanese Akoya Cultured Pearls using LA-ICP-MS

15:15 - 15:20 Discussions if any Concluding remarks of Jayshree Panjikar (Executive Secretary of IGC Executive Committee)