IGC https://validator.w3.org/feed/docs/rss2.html About IGC The International Gemmological Conference IGC 2027: Brazil Previous editions IGC 2025: Athens, Greece Abstract volumes The Importance and Methodology of Undertaking a Literature Search for Gemmological Research and Article Publishing Gem zircon and sapphire age dating and application of origin determination: A study from New England sapphire fields, New South Wales, Australia Abstracts library Found, Lost, and Found Again: The Geological and Gemological Significance of the Salininha Emerald Deposit, Brazil Amber and its treatments: A New Baltic Amber Classification Chart Advancing Fei Cui Origin Authentication: A comparison of green fei cui from Myanmar, Guatemala, Italy and Russia Typomorphic features of tourmalines of the Malkhan pegmatite field from the Irkutyanka vein Hurlbutite from Myanmar 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) Dyed purple Jade (Lavender jade or purple “Fei Cui”) from Mandalay’s jade market, Myanmar Low Temperature Heat Treatment of Madagascar Sapphire Noble gas in corundum: interests in gemology Zoisite and its many color Color Genesis Analysis and Characteristics for Origin Identification of Purple Jadeite Studying renowned fancy color diamonds in museum collections: the case of the Winston Red A convincing glass imitation of larimar (pectolite) Spinel from Sri Lanka – An update Effects of Gamma Irradiation on Corundum: Towards a Potential Detection Method Diamonds from Than Lwin River near Mong Hsu, Myanmar An approach to understanding the factors in the emerald enhancement clarity grading system used at CDTECGemlab Hessonite garnet from Angul district of Odisha, India 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 On the nature of blue rose quartz History of Garnet Mining and Cutting in the Austro-Hungarian Monarchy Identification of melee size synthetic coloured diamond for jewellery Pink-orange gem quality euclase from Bahia, Brazil Amber from the Thanbaya Gaing Coal Mine, Minbu Township, Magwe Region, Myanmar Pink to Red and Violet Diamonds from the Argyle Mine, Australia: Properties, Color Origin and Latest Research Results Application of Fibre Optics Reflectance Spectroscopy (FORS) for the determination of mineral pigments in jasper Rubies from Greenland Novel cultured pearls with ceramic nucleus and possible cause of their strong luster Nitrogen aggregates in yellow HPHT and CVD synthetic diamonds Historic Emeralds and their Geographic Origin: A Retrospective Study Shining light on “480 nm band” diamonds: Gemmological characteristics of an unusual group of diamonds with yellow and red luminescence Gems in Hellenistic and Roman Jewellery of Northern Greece: An investigation from the Collections of the Archaeological Museum of Thessaloniki, Greece Blue sapphire from Malacacheta of Minas Gerais, Brazil Fe-Ti charge transfers: A comprehensive review and its applications to minerals and gems Gem-quality pink fluorite from Planggenstock, Switzerland: chemical and physical properties and a comparison with pink fluorites from other localities HFSE-enriched sapphires of gem quality: A combined FTIR and trace element study and implications for heat treatment detection Geographic Origin Determination of Natural Yellow Sapphires: The Preliminary Study A Photo Survey of Inclusions in Fossiliferous Amber Modern Cultivation of Freshwater Pearls in China: Advances in Materials, Technique Gems in Greece: Geology, mineralogy and crystallizing environment Morphologies and Surface Features of Diamond Samples from Southern Thailand