 | | Journal (article/letter/editorial) | | sapphire-zircon-magnetite xenolith from the Chanthaburi Gem Province, Thailand ROBERTR. COENRAADS The Gemmological Association...Mineral Resources, Rama 6 Road, Bangkok 10400, Thailand AND F. [.IN SUTHERLAND Division of Earth and...magnetite-bearing xenolith from Khao Wua, near Chanthaburi in Thailand, conclusively demonstrates a common origin for...magnetite found in alluvial deposits in the Chanthaburi gem fields. The original aluminium- and titanium-rich...zircons (2.57 ___0.20 Ma) from the Chanthaburi-Trat gem fields and within the potassium-argon ages of 0.44 |  | | Journal (issue) | | Franks, B.Sc., Ph.D., F.G.A. South Yorkshire & District Branch: J. L Platts, F.G.A. Examiners: E. A. Jobbins...GREAT BRITAIN Vol. XIX No. 3 JULY 1984 CHROME DIOPSIDE FROM U.S.S.R. By HANS-WERNER SCHRADER, Dip. Min...University of Mainz, W. Germany. A lot of chrome diopside stated to be from an occurrence in the U.S.S.R...synthetic flux crystals (see Figures 1 and 2). Diopside, CaMg(Si 2 0 6 ), is a member of the pyroxene...end of the continuous crystalline solution of diopsideâhedenbergite (CaFe(Si 2 0 6 ) caused by the diadochy |  | | Journal (article/letter/editorial) | | Road, Khlong Toey Nua, Watthana, Bangkok 10110, Thailand *Corresponding author, e-mail: seriwat@hotmail...inclusions and coexisting minerals of gem corundum from the Thailand area analysed by SEM-EDS in this study...The ruby suite includes garnet (pyrope), high-Al diopside (âfassaiteâ) and sapphirine. The mineral chemistry...chemistry, SEM-EDS, corundum, ruby, sapphire, Thailand, origin. 1. Introduction Sutherland et al. (1998a)...conditions of the genesis of the host ruby from eastern Thailand. Garland et al. (2001) in a study of Montana sapphires |  | | Journal (issue) | | Blanche of Lancaster Black Spinel from Thailand Camera-Drone Gem Exploration Volume 37 / No. 1 / 2020...Report 2019 | Gold Demand Trends 2019 | ID of Green Gems with Portable Instruments | The Journalâs Cumulative...| Maine (USA) Mineral & Gem Museum Gem Notes Hessonite from Kunar Province, Afghanistan | Olshanskyite...26â64 of this issue describes its history and the gems it contains, which consist of blue and pink sapphires...and Gem Materials By Karl Schmetzer and H. Albert Gilg Black SpinelâA Gem Material from Bo Phloi, Thailand |  | Graham, Ian, Sutherland, Lin, Zaw, Khin, Nechaev, Victor, Khanchuk, Alexander (2008) Advances in our understanding of the gem corundum deposits of the West Pacific continental margins intraplate basaltic fields. Ore Geology Reviews, 34 (1) 200-215 doi:10.1016/j.oregeorev.2008.04.006 | Journal (article/letter/editorial) | | g e o r ev Advances in our understanding of the gem corundum deposits of the West PaciïŹc continental...greatly increased our knowledge of the basalt-derived gem sapphireârubyâzircon deposits. In this paper we focus... We also critically review existing data on the gem corundum deposits, in order to further reïŹne a model...200â215 201 Fig. 1. Late Mesozoic to Cenozoic gem corundum occurrences and associated basaltic ïŹelds...a distance of over 12,000 km (Fig. 1). Although gem corundums occur within the present-day alluvial systems |  | Yui, Tzen-Fu, Wu, Chao-Ming, Limtrakun, Phisit, Sricharn, Weerapan, Boonsoong, Apichet (2006) Oxygen isotope studies on placer sapphire and ruby in the Chanthaburi-Trat alkali basaltic gemfield, Thailand. Lithos, 86 (3) 197-211 doi:10.1016/j.lithos.2005.06.002 | Journal (article/letter/editorial) | | the Chanthaburi-Trat alkali basaltic gemfield, Thailand Tzen-Fu Yui a,*, Chao-Ming Wu b, Phisit Limtrakun...Science, Chiang Mai University, Chiang Mai 50200, Thailand Received 6 April 2005; accepted 8 June 2005 Available...(C-T) alkali basaltic gemfield in southeastern Thailand. Sapphires have O-isotope composition in the range...4.8x to +5.0x, demonstrating that the C-T placer gem corundums cannot be phenocrysts of these basalts...sub-continental mantle as the primary source for these placer gem corundums is tentatively proposed. The surface distribution |  | | Journal (issue) | | have been known to produce district of the Northern Rift Valley Province, and corundum in all possible...northwards through the Sudan appeared on the Kenyan gem market of which and Ethiopia (Bridges, 1982). some...stretches from the turn off the never appeared on the gem market. main Lodwar road to the Sudan. This is a...and peneplanation of hills, namely bluish-green gems. Lower grade rough can be used Pelekesh (1794m)... is located in the Turkana district of the Northern Rift Valley Province on the west side of Lake Turkana |  | | Journal (issue) | | JOURNAL OF THE GEMOLOGICAL INSTITUTE OF AMERICA Gem Art of the Taj Mahal and the Mughal Era Characteristics...in Corundum from Bo Welu, Thailand Fall 2019 VOLUME 55, No. 3 EDITORIAL 293 Gem Art of the Taj Mahal...Chris L. Rogers, and Robert Weldon A look at the gem ornamentation of this landmark, as well as the jewels...in Ruby and Sapphire from the Bo Welu Gem Deposit in Chanthaburi, Thailand Supparat Promwongnan and Chakkaphan...and Color of Cultured Half-Pearls from Phuket, Thailand Kannika Kanjanachatree, Napapit Limsathapornkul |  | | Journal (article/letter/editorial) | | terrains sparsely distributed in eastern Australia, Thailand and eastern China. The lack of understanding of...alluvial processes resulted in economic deposits of the gem-quality variety sapphire in eastern Australia, eastern...China, the Indochina region of southeastern Asia (Thailand, Vietnam and Cambodia) and northern Africa (Kenya...corundum crystals in basalts of the Hoy Volcanic Province in central Queensland, Australia. At two localities...abundance of xenoliths and of corundum (Fig. 1 a). The gem-quality corundum Fig. 1 a A deep blue corundum megacryst |  | | Journal (issue) | | Association and Gem Testing Laboratory of Great Britain The Gemmological Association and Gem Testing Laboratory...3334 l Fax: +44 (0)20 7404 8843 e-mail: information@gem-a.info l Website: www.gem-a.info President: E A Jobbins...very likely also be © Gemmological Association and Gem Testing Laboratory of Great Britain ISSN: 1355-4565...for alexandrite effect. Alexandrite effect (AE) Gem minerals changing colour between daylight and incandescent...first observed in a mineral found in the emerald mines at Tokowaia in the Urals (Wörth, 1842; Kokscharow |  | | Conference Proceedings | | term cultured pearl. Experts from various European gem testing laboratories were invited to attend a series...per country; this member being the Director of a Gem Testing Laboratory, or a gemmologist of the calibre...Stellenboch (1991), Paris, France (1993); Bangkok, Thailand (1995); Idar Oberstein, Germany (1997); Goa, India...Spain, Sri Lanka, Switzerland, Sweden, Tanzania, Thailand, U.S.A., Vietnam and Zimbabwe. During the 20th...14:40 Alessandra Costanzo , Martin Feely: Review gem-materials from Connemara, Western Ireland. 14:40 |  | Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 | Journal (article/letter/editorial) | | uncommon on Earth but the gem varieties of ruby and sapphire are relatively rare. Gem corundum deposits are...specifically Type IA where xenocrysts or xenoliths of gem ruby of metamorphic (sometimes magmatic) origin are...models; exploration 1. Introduction Ruby is the red gem variety of the mineral corundum. The name corundum...Rubyâ for gems mined from the modern-day Tajikistan (spinel), and âBohemian rubyâ was used for gems coming...science, but also about history, art, and trade, these gems are still called by their historic ârubyâ name, |  | | Journal (issue) | | Phillips and Anatoly S. Talantsev Opal from Shewa Province, Ethiopia Mary L. Johnson, Robert C. Kammerling...and John I. Koivula REGULAR FEATURES Gem Trade Lab Notes Gem News Thank you, Donors Book Reviews Gemological...Guidelines for Authors ABOUT THE COVER: Perhaps no gem material in modern times carries the mystique of...Communist Russia, however, demantoids-like other gems-fell out of favor. With virtually no mining for...Pelt-Photographers, Los Angeles, CA. Color separations for Gems & Gemology are by Effective Graphics, Compton, CA |  | Palke, Aaron C., Wong, Jacqueline, Verdel, Charles, Ăvila, JanaĂna N. (2018) A common origin for Thai/Cambodian rubies and blue and violet sapphires from Yogo Gulch, Montana, U.S.A.?. American Mineralogist, 103 (3) 469-479 doi:10.2138/am-2018-6164 | Journal (article/letter/editorial) | | with rubies from the Chantaburi-Trat region of Thailand and the Pailin region of Cambodia. The similarities...rubies and Yogo sapphires suggest a common origin for gem corundum from both deposits. Specifically, we advance...the lamprophyre or basalts that transported the gem corundum to the surface partially melted Al-rich...transported them to the surface. The similarities in these gem corundum deposits suggests that the partial melting...previously realized. Importantly, in both cases the gem corundum has an ostensibly âmetamorphicâ trace element |  | Baldwin, L. C., Tomaschek, F., Ballhaus, C., Gerdes, A., Fonseca, R. O. C., Wirth, R., Geisler, T., Nagel, T. (2017) Petrogenesis of alkaline basalt-hosted sapphire megacrysts. Petrological and geochemical investigations of in situ sapphire occurrences from the Siebengebirge Volcanic Field, Germany. Contributions to Mineralogy and Petrology, 172 (6) doi:10.1007/s00410-017-1362-0 | Journal (article/letter/editorial) | | Carbonatite Introduction Sapphire and ruby are gem varieties of corundum (α-Al2O3) and belong to the...gemstones, along with diamond and emerald. Deposits of gem-quality corundum are well distributed around the...g., Hughes 1997). A review of the literature on gem corundum shows that corundum occurs in various geological...volcanism as these are among the worldâs largest gem corundum suppliers (e.g., Guo et al. 1996; Limtrakun...et al. 2015), while numerous corundum, including gem crystals, were recorded in extensive flows south |  | | Journal (article/letter/editorial) | | zircon. Introduction SAPPHIRES and rubies are gem varieties of corundum (Al2O3) that have very âpureâ... © 2017 The Mineralogical Society accompanying gem-quality zircon (e.g. Graham et al., 2008; Giuliani...between intraplate Cenozoic basalts (black areas) and gem corundum deposits (unfilled hexagons). Taken and...for volcanic provinces from Raymond et al. (2012). Gem deposits compiled from Sutherland and Abduriyim (2009)...studied. 1553 JACQUELINE WONG ET AL. TABLE 1. Gem fields and associated lava-fields of eastern Australia |  | | Report (issue) | | GEOLOGICAL SURVEY Geology and mineral deposits of Thailand by I/ D. R. Shawe Open-File Report 84- Prepared...Prepared on behalf of the Government of Thailand and the Agency for International Development, U.S. Department..................................... GEOLOGY OF THAILAND.................................................framework of the region surrounding Thailand..... Geologic history of Thailand............................................................................... Gem minerals........................................ |  | | Journal (issue) | | .......................................... 50 Thailand ................................................Enterprises, Thailand; Facets Show, Sri Lanka; Thai Gems and Jewelry Traders Association, Thailand; Hong Kong...Pandit, Tanzania Janet Ann Russell, Thailand Surasit Sriorathaikul, Thailand Edward Boehm, USA InColor is published...the amazing array of gems and gem people. Even for an experienced gemologist or gem dealer nowadays it...ICA Ambassadors, miners and members active in the gem trade all around the world, for working hard in gathering |  | | Book | | r· Butterworths Gem Books Edited by Peter G. Read Amber Helen Fraquet Beryl John Sinkankas and Peter... Huddlestone Topaz D. B. Hoover Butterworths Gem Books Corundum Richard W. Hughes Executive Vice...Asian Institute of Gemological Sciences, Bangkok, Thailand Butterworth-Heinemann London Boston Singapore...Corundum/Richard W. Hughes. p. cm.-{Butterworths gem books) Bibliography: p. Includes index ISB!'i 0-7506-1006-9:...(colour swirls), etc. Major sources: Burma, Thailand, Cambodia, Sri Lanka, India, Australia, Kenya |  | | Journal (issue) | | Journal of Gemmology THE GEMMOLOGICAL ASSOCIATION AND GEM TESTING LABORATORY OF GREAT BRITAIN OFFICERS AND... R. Cavey, FGA The Gemmological Association and Gem Testing Laboratory of Great Britain 27 Greville Street...ISSN: 0022-1252 J. Gemm., 1991,22,8 458 THE GEM DIAMOND DIPLOMA GAGTL have brought together the finest...world of diamonds to produce the most comprehensive Gem Diamond home study course available. The course acknowledges...international diamond market and includes every aspect of gem diamond you will ever need to know. Following an |  | | Journal (issue) | | I. Koivula REGULAR FEATURES 294 Gem Trade Lab Notes 300 Gem News 310 Gemological Abstracts 318...in existence. Two senior staff members of the GIA Gem Trade Laboratory traveled to Dresden, Germany, to...Krementz Gemstones; @ Robert E. IZane. Typesetting for Gems & Gemology is by Scientific Composition, Los Angeles...828-0247 Contributing Editor John I. Koivula Editors, Gem News John I. Koivula Robert C. Kammerling Art Director...Monica, CA Emmanuel Fritsch SUBSCRIPTIONS Editor, Gem Trade Lab Notes C . W Frver , Kenneth Scarratt |  | | Journal (issue) | | by the Assure Program Inclusions in Thai Rubies Gem Exploration in Canada Images Seen Through Calcite...Presentations | Platinum Jewellery Business Review 2019 Gem Notes Albite from Brazil | Dark Blue Beryl from Pakistan...International Co. Ltd, Bangkok, Thailand, and the center and right rings are from Prima Gems, Bangkok). Photo by...Composition in Ruby from the Bo Rai Gem Field in Trat Province, Eastern Thailand By Supparat Promwongnan and...Conference | 7th European Gemmological Symposium Gem-A Notices 664 Learning Opportunities 666 New Media |  | | Journal (article/letter/editorial) | | 8 cts and up to 200 cts), and quality, including gems, the U/P type dominates in Siberian kimberlites...garnet, diopside and magnesite inclusions and polymineralic (touching) coesite-diamond and diopside-diamond...1st level of the Christiana 132 area, Kamariza Mines, Lavrion, East Attica, Greece. This mineral phase...ĂSTERR.MINER.GES. 165 (2019) GEM-QUALITY BLACK SPINEL FROM BO PHLOI, THAILAND Kruzslicz, Ă.B.1, Nasdala...Bangkok 10110, Thailand e-mail: lutz.nasdala@univie.ac.at 1 2 Since the descent of gem corundum production |  | | Journal (issue) | | INSTITUTE OF AMERICA Geographic Origin Special Issue Gems & Gemology Journals, Charts and More Available Through...facing the gem and jewelry industry today. FEATURE ARTICLES 464 Geology of Corundum and Emerald Gem Deposits:...last two decades, knowledge of the formation of gem deposits has improved significantly. This article...state of our knowledge of the geology and genesis of gem corundum and emerald deposits. p. 569 512 A Review... Breeding, and Barbara L. Dutrow Copper-bearing gem tourmaline, known as ParaĂba tourmaline after the |  | Sutherland, Frederick, Zaw, Khin, Meffre, Sebastien, Thompson, Jay, Goemann, Karsten, Thu, Kyaw, Nu, Than, Zin, Mazlinfalina, Harris, Stephen (2019) Diversity in Ruby Geochemistry and Its Inclusions: Intra- and Inter- Continental Comparisons from Myanmar and Eastern Australia. Minerals, 9 (1) 28 doi:10.3390/min9010028 | Journal (article/letter/editorial) | | in the presence of lesser Cr contents. Numerous gem corundum-bearing sites are known in SE Asia, where...Mogok and Mong Hsu, Myanmar and East Australian gem regions involve the western Pacific continental margins...Geological Settings, Myanmar The corundum-bearing gem deposits in the Mogok area include both in situ and... and associated gem workings of the Mogok area, is shown in Figure 2. The Mogok gem stone tract at the...Myanmar and East Australian gem deposits, within the Figure Australian gem deposits, within the West Figure |
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