 | | Journal (issue) | | inclusions or these cannot be seen because the host gem is too opaque. The brownish opal termed hyalite,...KennethScarratt, Kenneth Scarratt, F.G.A. F.G.A. The Gem Gem Testing Testing Laboratory Laboratory of of Great...Laboratory's name that has changed, firstly from 'The Gem Testing Laboratory of the London Chamber of of Commerce...Commerce and Industry' and then to 'The British Gem Testing Laboratory of the London Chamber ofCommerce...The The Laboratory Laboratory is now known as 'The Gem Testing Laboratory of of Great Britain'.. Britain' |  | Bosi, Ferdinando, Skogby, Henrik, Ciriotti, Marco E., Gadas, Petr, Novák, Milan, Cempírek, Jan, Všianský, Dalibor, Filip, Jan (2017) Lucchesiite, CaFe2+3Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup. Mineralogical Magazine, 81 (1) 1-14 doi:10.1180/minmag.2016.080.067 | Journal (article/letter/editorial) | | tourmaline supergroup. It occurs in the Ratnapura District, Sri Lanka (6°35′N, 80°35′E), most probably from...of ∼7 and a calculated density of 3.209 g/cm3 (Sri Lanka) to 3.243 g/cm3 (Czech Republic). In plane-polarized...intensity data. Crystal-chemical analysis for the Sri Lanka (holotype) and Czech Republic (cotype) samples...deposited: (1) the holotype specimen from Ratnapura, Sri Lanka, in the collections of the Museum of Mineralogy...Oxy-species Oxy-chromium-dravite Oxy-dravite Oxy-schorl Oxy-vanadium-dravitea Vanadio-oxy-dravite Vanadio-oxy-chromium-dravite |  | Giuliani, Gaston, Fallick, Anthony E., Boyce, Adrian J., Pardieu, Vincent, Pham, Van Long (2017) Pink and Red Spinels In Marble: Trace Elements, Oxygen Isotopes, and Sources. The Canadian Mineralogist, 55 (4) 743-761 doi:10.3749/canmin.1700009 | Journal (article/letter/editorial) | | of the main productive and historical sources of gem spinel. Three consistent sets of d18O values were...study shows that it is possible to discriminate gem spinels hosted by marbles from different geographic...oxygen isotopes, geographic origin. INTRODUCTION Gem spinel belongs to the aluminous spinel subgroup A2þB3þ2O4...Pardieu/GIA; (E) E. Gaillou/ENSMP. Badakshan Province in Afghanistan (Spencer 1937). In Roman times...SPINELS IN MARBLE FIG. 2. Location of pink and red gem spinel deposits (large star) and occurrences (small |  | | Journal (issue) | | Australia: Canadian Gemmological Association: Rhodesian Gem and Mineral Society. F.G.A. F.G.A. F.G.A. F.G.A...time came, the 'American Gem Society'. Very broadly speaking, the American Gem Society corresponds to the...had become attracted to the scientific study of gem materials. In some cases these 'outside' attachments...known as authors of the standard textbook Gems and Gem Materials. Other valuable long-term appointments...laboratory gemmologist as Director of the New York Gem Trade Laboratory. In 1952, at the age of 65, and |  | | Journal (issue) | | FEATURE ARTICLES 2 A New Method for Determining Gem Tourmaline Species by LA-ICP-MS Ziyin Sun, Aaron...a simplified but comprehensive classification of gem tourmaline species based on quantitative measurement...Zircon Inclusions in Sapphires from Ratnapura and Balangoda (Sri Lanka) and Implications for Geographic...sapphire • Quarterly Crystal: Orpiment in barite 118 Gem News International Tucson 2019 • Boulder opal mining...Responsibly sourced gemstones • The Chinese and Japanese gem markets • Unusual and vibrant gems • Jeff Hapeman |  | | Journal (issue) | | Australia: Canadian Gemmological Association: Rhodesian Gem and Mineral Society. THE JOURNAL OF GEMMOLOGY A...BRITAIN Vol. X I V N o . 8 O C T O B E R 1975 ON GEM ELBAITE FROM NEWRY, MAINE, U.S.A. By PETE J. DUNN...significant find of gem quality elbaite (lithium tourmaline) was made at the Dunton gem mine, Newry, Maine...facet-grade. Some gem pockets had been found in recent years, but the yield of gem material was small...however, and only serves to give the beautiful red gem material a crackled green coat! The thin outer green |  | | Journal (issue) | | Tribute to Robert M. Shipley, Jr. The Chanthaburi-Trat Gem Field, Thailand Peter C. Keller 197 Gemstones with...Alexandrite Effect E. Giibelin and K. Schmetzer 204 Gem-Quality Grossular Garnets D. Vincent Manson and Carol...Crystal: The Van Pelt Collection John Sinkankcis 221 Gem-Quality Friedelite from the Kalahari Manganese Field...REGULAR FEATURES Gem Trade Lab Notes Editorial Forum Gemological Abstracts Book Reviews Gem News Index to...Liddicoat, Jr. Associate Editor Peter C. Keller Editor, Gem Trade Lab Notes Chuck Fryer Editor, Gemological Abstracts |  | | Book | | assemblage such as the zeolites from India, or high gem quality such as the rubies from Burma, or some significantly...notable example in this category is the Nuristan District of Afghanistan, which over the past 10 years has...has produced some of the most extraordinary gem minerals ever found. The majority of this volume is based...Saijo, Iyo Province, Ehime Prefecture, Island of Shikoku Ashio Mine, Shimotsuke Province, Tochigi Prefecture...Arakawa Mines, Ugo Province, Akita Prefecture, Honshu The Obira Mine, Bungo Province, Oita Prefecture, |  | | Journal (issue) | | invite you to be our guest at Hong Kong Jewellery & Gem Fair September 16th-20th 2019 AWE - Booth 8E03 German...Spinel Pink and Red Gem Spinels in Marble and Placers Spinel from Tajikistan – The Gem That Made Famous...Spinels of Mogok – A Brief Overview Spinels from Sri Lanka 54 The Spinels of Mahenge, Tanzania In Search...Responsibility 94 Book Review Discovering the Gems of Sri Lanka 98 100 108 113 Members 14 Saurabh Bansal Damien...Shirley Xue Li Zhang, Hong Kong E. Gamini Zoysa, Sri Lanka Advisors Jean Claude Michelou, Colombia Ruben |  | | Book | | region encompasses ·what may be the world's richest gem deposits, and is explored in depth in this pioneering...clearly among the world's richest areas, akin to Sri Lanka and Brazil, which interestingly, share a similar...It is rapidly becoming of major importance to the gem world. East Africa is home to two of the world's...Africa 3 Geological Overview of East Africa's Gem Fields 3 The Tanzanian Shield 6 The Mozambique Belt...Longido, Northern Province, Tanzania 28 Ruby and Sapphire from Umba, Tanga Province, Tanzania 32 Sapphire |  | | Journal (issue) | | Branch: M. P. Gayton, F.G.A. South Yorkshire & District Branch: 1. R. M. Lewis, F.G.A. Examiners: B. W...many others, I owe all such knowledge of gems and gem materials as I possess—apart, in my case, from such...matters more complicated the actual weights used by gem merchants with their balances were numbered 1000...appeared in the early years of the century are The Gem Cutter's Craft by L. Claremont (London, 1906), which...was my standby when I first started work in the Gem Testing Laboratory, but one had to wait until 1940 |  | | Book | | E. Post, Geologist, Curator-in-Charge, National Gem and Mineral Collection, National Museum of Natural...at www.dk.com CONTENTS INTRODUCTION What is a Gem? 8 How Gems Form 10 Crystals 12 Classifying...Cutting Gems 28 Polishing and Engraving Gems 30 Gem Enhancement 32 Synthetic Gems 34 History and... 214 Index 218 Acknowledgments 223 HOW THE GEM PROFILES WORK main section ; profile information...viene INTRODUCTION ‘ag yet Gay x 2 WHAT IS A GEM? Gems are generally defined as precious or semiprecious |  | | Journal (issue) | | No. 8 / 2019 COLUMNS What’s New 679 ABCD Pro-1 Gem Testing Set | D-Imaging Device | Raman Spectroscopy...| Jewelry Journey Podcasts | Gemewizard Gem Color Academy Gem Notes Amethyst from Zimbabwe | Apatite...Fuchsite Phantom Inclusions | Tourmaline from Sri Lanka with Transient Tenebrescence? | Diving for Natural...710–725 of this issue) and therefore does not have a Sri Lankan origin as commonly described for Roman sapphires...Trapiche Ruby from Khoan Thong, Luc Yen Mining District, Northern Vietnam 726 By Isabella Pignatelli |  | | Book (edition) | | EDITION AREM, PH.D., FG.A. gem gemologists, 1977, jewelers, and gem collectors, dealers have relied...INTRODUCTION What / Gem? a / Scope of This Book / Is The Nature Gems of GEM SECTION 1 2 GEMSTONES...Rock Classification Gem Scarcity Intrusive Crystal 6 Growth Synthetic Gem 9 / Gemstones SOURCES...dealers are aware of the growing value of exotic gem species; the list of known taaffeites has thus grown...greater monetary reward than are the tists who gem scien- build detection equipment. Inevitably, a |  | | Report (issue) | | Alexander U. Falster and William B. Simmons • Dravite from Qarusulik, Ameralik Fjord in Southwestern...this crown was not a ruby, but a tourmaline. The gem in this crown is now the oldest known important tourmaline...of Sri Lankan origin, are estimated to weigh more than 100 carats. The spinels are from Sri Lanka and... the rubies are from either Sri Lanka or Burma and the aquamarine is Sri Lankan. The tourmaline could...until its early eighteenth century arrival on the gem mar kets of Amsterdam, that tourmaline gained notice |  | | Book | | Properties of crystals Gem crystals 18 19 19 20 20 21 22 32 33 3 3.1 3.2 3.3 Gem testing Hardness Gemstones...56 4 4.1 4.2 4.3 4.4 4.5 Recent developments in gem testing 59 59 60 61 64 65 Thermal conductivity...understandably and rightly, with the science of gem testing and have covered that area very well. Details...entirely new gem mineral species have been found in the last few years; tanzanite, appearing on the gem market...with no gem potential whatever. It is not likely that many entirely new mineral species with gem application |  | | Journal (issue) | | inclusions betray a turbulent evolution of the host gem which is rich in two-phase inclusions. T h e y either...1976.] 295 J. Gemm, 1977, XV, 6 GEM MONAZITE FROM SRI LANKA* By E. A. JOBBINS, ANNE E. TRESHAM, B...Miss G. Sri Nissanka, a keen Colombo gemmologist, was sorting through gem gravels from Sri Lanka and noted...x-ray powder diffraction data for a gem monazite from Sri Lanka. CoKa radiation (X=1-790207Â) a 6-761Â...II ELECTRON MIGROPROBE ANALYSIS OF GEM MONAZITE FROM SRI LANKA Si02 Th02 u3o8 Ge203 La203 Nd203 Pr6On |  | | Book | | provides a comprehensive examination of gems and gem materials including discussion of their properties...and popularity in different cultures. The Museum's gem collection, itself the stuff of legends, is described...factors important in determining the quality of each gem and spells out the possible confusions in gemstone...TO THOSE WHO HAVE HELPED CREATE THE MINERAL AND GEM COLLECTIONS. Those whose donations are featured...Tourmaline PAGE 88 18 Zircon& What1a Rridot Gem? PAGE PAGE 22 Corundum Diamond PAGE PAGE 44 |  | | Book | | Hitge specimen, Bruce Cairncross photo; (bottom) Gem-quality green chromian diopside crystals on large...member of a family that has been in the East African gem and mineral industry for three generations - starting...(Taita), malaya (Samburu), chrome (Taita). of the gem and mineral bounty of East Africa to the world market...established East Africa as an important source of fine gem material. Furthermore, the region has produced some...sources of some interesting material (for example, the gem-quality tourmaline that can be found in Rwanda). |  | | Book | | E YE WI TNES S HA N D B O O KS GEM STONES The visual guide to more than 130 gemstone varieties...org/details/gemstoneseyewitnOOcall EYEWITNESS HANDBOOKS GEM STONES E YE WI TNESS HANDBOOKS GEMSTONES Cally...varieties are found and fashions change. Over 130 gem species, including some exceptionally rare stones...why the species entries in this its book show the gem rough, natural state, perhaps embedded in still...they can be appreciated by anyone, from the amateur gem-spotter to the enthusiast who enjoys their beauty |  | | Journal (issue) | | Hays A Prospectors' Guide Map to the Gem Deposits of Sri Lanka C. B. Dissanayuke and M.S . Rupasinghe...Fritsch, and llene Reinitz REGULAR FEATURES Gem Trade Lab Notes Gem News Book Reviews Gemological Abstracts...Hey1 Contributing Editor John I. Koivula Editor, Gem Trade Lab Notes Editor, Gemological Abstracts C....Gems & Gcmology, contact the Association of Japan Gem Trust, Okactumachi Cy Bldg., 5-15-14 Ucno, Taito-ku... Technical Editor Carol M. Stoclcton Editors, Gem News John 1. Koivula Robert C. Kammerling Emmanucl |  | | Journal (issue) | | Association and Gem Testing Laboratory of Great Britain Gemmological Association and Gem Testing Laboratory...Vol 29, No.3, July 2004 ISSN: 1355^1565 129 Gem corundum deposits in Vietnam Pham Van Long1, Hoang...Dubessy5 and Phan Trong Trinh2 1. Vietnam National Gem and Gold Corporation, 91 Dinh Tien Hoang Street,...Kilbride G75 OQF, Scotland Abstract: Since 1983, gem-quality rubies have been recovered from the Luc Yen...Association and Gem Testing Laboratory of Great Britain ISSN: 1 355-4565 130 129 Figure 1: (a) Gem-quality |  | Giuliani, Gaston, Dubessy, Jean, Banks, David, Hoàng Quang, Vinh, Lhomme, Thérèse, Pironon, Jacques, Garnier, Virginie, Phan Trong, Trinh, Pham Van, Long, Ohnenstetter, Daniel, Schwarz, Dietmar (2003) CO2–H2S–COS–S8–AlO(OH)-bearing fluid inclusions in ruby from marble-hosted deposits in Luc Yen area, North Vietnam. Chemical Geology, 194 (1) 167-185 doi:10.1016/s0009-2541(02)00276-0 | Journal (article/letter/editorial) | | BP 20, 54501 Vandœuvre, France f Vietnam National Gem and Gold Corporation, 91 Dinh Tien Hoang street,...from marble-hosted deposits in the Luc Yen mining district, North Vietnam. Raman and Infrared spectroscopy...transparency, and may reach very high carat prices on the gem market (Ward, 1998). Primary deposits occur in Tajikistan...North Vietnam (Luc Yen) and South China (Yunnan province). All the deposits are hosted by metamorphosed...inclusions in rubies from marbles in the Luc Yen mining district. The composition of the fluids involved in the |  | | Journal (issue) | | reputation? It’s the most reliable, authentic, dependable gem institute in the world. People know that, especially...Sapphire from the Tan Huong–Truc Lau Area, Yen Bai Province, Northern Vietnam Nguyen Ngoc Khoi, Chakkaphan...Nhung Although not as well known as the Luc Yen district, this area is an important source of ruby and...Green sapphires with different chromophores 234 Gem News International Greenish brown diamonds with color...and zircon from Ethiopia • Sapphire mining in Sri Lanka • Green cat’s-eye spodumene from Brazil • Color-zoned |  | | Journal (issue) | | January 1996 The Gemmological Association and Gem Testing Laboratory of Great Britain President E...B.5c., FGA DGA The Gemmological Association and Gem Testing Laboratory of Great Britain 27 Greville Street...of minerals associated with the rubies in the gem gravels, are considered in modelling how the particular...Journal of the great potential of Russia for supply of gem materials, and amber possibly having come from this...this source is described in Notes from the Gem and Pearl Testing Laboratory, Bahrain. The composition |
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