Volume 36 / No. 5 / 2019 Inclusions in Burmese Spinel Peridot from China and N. Korea Connemara Marble Gem Faceting in Sri Lanka Examination of ‘Coconut Pearls’ Volume 36 / No. 5 / 2019 Cover photo: Burmese spinel is available as attractive crystals and colourful gemstones, and a detailed study of the inclusions in this material appears on pp. COLUMNS 418–435 of this issue. The Burmese spinels shown here include the 6.30 ct centre stone in a gold and carbon-fiber ring that was designed and manufactured by What’s New 393 Marc Höllmüller for Carley Jewels (Chattanooga, Tennessee, USA), as well as GemPen | J-Certain Synthetic three larger and nine smaller crystals (courtesy of Federico Barlocher, Como, Diamond Detector | Sherlock Italy, and Kathryn Bonanno, New York, New York, USA, respectively) and numerous cut gemstones that weigh up to 10.48 ct (courtesy of RareSource, Holmes 2.0 Synthetic Diamond Chattanooga Tennessee, USA). Photo by Jeff Scovil. Detector | ABN-AMRO Diamond Reports | AGTA GemFair Tucson Seminars | Gem Abstracts from ARTICLES the 16th Swiss Geoscience Meeting | Gem Abstracts from Spinel from Mogok, Myanmar—A Detailed Inclusion Study by 418 the 2018 GSA Annual Meeting | Raman Microspectroscopy and Scanning Electron Microscopy Gem Identification Pamphlet By Myint Myat Phyo, Eva Bieler, Leander Franz, and Poster | GIT Reports on Colour-Change Grossular and Walter Balmer and Michael S. Krzemnicki Musgravite | Global Diamond Industry 2018 | Gold Demand Characterisation of Peridot from China’s Jilin Province 436 Trends 2018 | Jewelry and from North Korea Development Impact By Zhiqing Zhang, Min Ye and Andy H. Shen Index Studies | The Journal’s Cumulative Index Updated, The Modern History of Gemstone Faceting in Sri Lanka 448 Plus Subject Bibliographies | By Justin K Prim LMHC Information Sheet Updates | MVI Marketing Mineral Liberation Analysis and Scanning Electron 456 Research on Millennials and Microscopy of Connemara Marble: New Mineral Synthetic Diamonds | Assume Distribution Maps of an Iconic Irish Gem Material Program for Testing Diamond By Martin Feely, Derek H. Wilton, Alessandra Costanzo, Albert D. Verification Instruments | Raman Spectroscopy of Jade Kollar, Dylan J. Goudie and Ambrose Joyce and Its Imitations | Responsible Sourcing CIBJO Blue Book | 419 436 Santa Fe Symposium Proceedings | Sapphires Heated with Pressure | Small-Scale Mining in Kenya | SSEF Facette | Synthetic Periclase Identified by GRS | ColorCodex Update | GemePrice Update | Composite photo by V. Lanzafame, © SSEF Photo by Z. Zhang Museum of Whitby Jet Opens Gem Notes 402 GEMMOLOGICAL BRIEF 468 ‘Black Anorthoclase’ from Antarctica | Blödite | Purple A Brief Study of Three Reported ‘Coconut Pearls’ Fluorite in Opal from Utah, from Southeast Asia USA | Garnets from Eastern By Henry A. Hänni and Chiara Parenzan Democratic Republic of the Congo | Obsidian from Slovakia | Spessartine Crystals from Nigeria | A Faceted Conferences 472 Sulphur | Chidliak Diamond AGA Tucson Conference | 21st FEEG Symposium and CIBJO Mine in Canada | Synthetic Seminar on Responsible Sourcing Periclase | Myanma Gems Enterprise 2018 Rough Stone Sale and Opening of Mandalay Gem-A Notices 475 New Media 481 Yatanar Mall | Educational Learning Opportunities 478 Literature of Interest 486 Aspects of Myanmar Gem Fairs The Journal is published by Gem-A in collaboration with SSEF and with the support of AGL. ISSN 1355-4565 (Print), ISSN 2632-1718 (Online), http://doi.org/10.15506/JoG.2019.36.5 THE JOURNAL OF GEMMOLOGY, 36(5), 2019 i EDITOR-IN-CHIEF EDITORIAL Brendan M. Laurs ASSISTANT [email protected] Carol M. Stockton EXECUTIVE EDITOR EDITOR EMERITUS Alan D. Hart Roger R. Harding ASSOCIATE EDITORS 21 Ely Place Ahmadjan Abduriyim, Tokyo, Japan; Raquel Alonso-Perez, Harvard University, Cambridge, Massa- London EC1N 6TD chusetts, USA; Edward Boehm, RareSource, Chattanooga, Tennessee, USA; Maggie Campbell Pedersen, UK Organic Gems, London; Alan T. Collins, King’s College London; John L. Emmett, Crystal Chemistry, Brush Prairie, Washington, USA; Emmanuel Fritsch, University of Nantes, France; Rui Galopim de Carvalho, t: +44 (0)20 7404 3334 PortugalGemas Academy, Lisbon, Portugal; Lee A. Groat, University of British Columbia, Vancouver, Canada; f: +44 (0)20 7404 8843 Thomas Hainschwang, GGTL Laboratories, Balzers, Liechtenstein; Henry A. Hänni, GemExpert, Basel, e: [email protected] Switzerland; Jeff W. Harris, University of Glasgow; Alan D. Hart, Gem-A, London; Ulrich Henn, German w: https://gem-a.com Gemmological Association, Idar-Oberstein; Jaroslav Hyršl, Prague, Czech Republic; Brian Jackson, National Museums Scotland, Edinburgh; Mary L. Johnson, Mary Johnson Consulting, San Diego, California, USA; Registered Charity No. 1109555 Stefanos Karampelas, Bahrain Institute for Pearls & Gemstones (DANAT), Manama; Lore Kiefert, Gübelin A company limited by guarantee and Gem Lab Ltd, Lucerne, Switzerland; Hiroshi Kitawaki, Central Gem Laboratory, Tokyo, Japan; Michael S. registered in England No. 1945780 Krzemnicki, Swiss Gemmological Institute SSEF, Basel; Shane F. McClure, Gemological Institute of America, Registered office: Palladium House, Carlsbad, California; Jack M. Ogden, Striptwist Ltd, London; Federico Pezzotta, Natural History Museum 1–4 Argyll Street, London W1F 7LD of Milan, Italy; Jeffrey E. Post, Smithsonian Institution, Washington DC, USA; Andrew H. Rankin, Kingston University, Surrey; Benjamin Rondeau, University of Nantes, France; George R. Rossman, California Institute of Technology, Pasadena, USA; Karl Schmetzer, Petershausen, Germany; Dietmar Schwarz, Federated Inter- national GemLab, Bangkok, Thailand; Menahem Sevdermish, Gemewizard Ltd, Ramat Gan, Israel; Andy PRESIDENT H. Shen, China University of Geosciences, Wuhan; Guanghai Shi, China University of Geosciences, Beijing; Maggie Campbell Pedersen James E. Shigley, Gemological Institute of America, Carlsbad, California; Christopher P. Smith, American Gemological Laboratories Inc., New York, New York; Evelyne Stern, London; Elisabeth Strack, Gemmolo- VICE PRESIDENTS gisches Institut Hamburg, Germany; Tay Thye Sun, Far East Gemological Laboratory, Singapore; Pornsawat David J. Callaghan Wathanakul, Kasetsart University, Bangkok; Chris M. Welbourn, Reading, Berkshire; Bert Willems, Leica Alan T. Collins Microsystems, Wetzlar, Germany; Bear Williams, Stone Group Laboratories LLC, Jefferson City, Missouri, USA; J. C. (Hanco) Zwaan, National Museum of Natural History ‘Naturalis’, Leiden, The Netherlands. Noel W. Deeks E. Alan Jobbins CONTENT SUBMISSION Andrew H. Rankin The Editor-in-Chief is glad to consider original articles, news items, conference/excursion reports, announce- ments and calendar entries on subjects of gemmological interest for publication in The Journal of Gemmology. HONORARY FELLOWS A guide to the various sections and the preparation of manuscripts is given at https://gem-a.com/index. Gaetano Cavalieri php/news-publications/journal-of-gemmology/submissions, or contact the Editor-in-Chief. Andrew Cody SUBSCRIPTIONS Terrence S. Coldham Gem-A members receive The Journal as part of their membership package, full details of which are given Emmanuel Fritsch at https://gem-a.com/membership. Laboratories, libraries, museums and similar institutions may become direct subscribers to The Journal. HONORARY DIAMOND MEMBER ADVERTISING Enquiries about advertising in The Journal should be directed to [email protected]. Martin Rapaport For more information, see https://gem-a.com/news-publications/media-pack-2019. CHIEF EXECUTIVE OFFICER DATABASE COVERAGE Alan D. Hart The Journal of Gemmology is covered by the following abstracting and indexing services: Australian Research Council academic journal list, British Library Document Supply Service, Chemical Abstracts (CA Plus), Copyright Clearance Center’s RightFind application, COUNCIL CrossRef, EBSCO Academic Search Ultimate, Gale/Cengage Learning Academic OneFile, Justine L. Carmody – Chair GeoRef, Index Copernicus ICI Journals Master List, Mineralogical Abstracts, Cambridge Kathryn L. Bonanno Scientific Abstracts (ProQuest), Scopus and the Clarivate Analytics (formerly Thomson Joanna Hardy Reuters/ISI) Emerging Sources Citation Index (in the Web of Science). Philip Sadler Christopher P. Smith COPYRIGHT AND REPRINT PERMISSION For full details of copyright and reprint permission contact the Editor-in-Chief. The Journal of Gemmology is published quarterly by Gem-A, The Gemmological Association of Great Britain. Any opinions expressed BRANCH CHAIRMEN in The Journal are understood to be the views of the contributors and not necessarily of the publisher. Midlands – Louise Ludlam-Snook North East – Mark W. Houghton Design & production by Zest Design, www.zest-uk.com South East – Veronica Wetten Printed by DG3 Group (Holdings) Ltd South West – Richard M. Slater © 2019 Gem-A (The Gemmological Association of Great Britain) ISSN 1355-4565 (Print), ISSN 2632-1718 (Online) Cert no. TT-COC-002454 ii THE JOURNAL OF GEMMOLOGY, 36(5), 2019 What’s New INSTRUMENTATION GemPen J-Certain Sweden-based Gemometrics AB released its GemPen in Synthetic 2018. The rechargeable handheld tool utilises different Diamond combinations of UV wavelengths and filters to induce Detector various fluorescence reactions that provide indications The J-Certain for screening natural from synthetic diamond (both from Massive HPHT and CVD grown), as well as some treatments Tech Labs such as HPHT + irradiation, glass fillings, and oiling (Gujarat, India) or fracture filling. The instrument’s