DOCSLIB.ORG

IGC VIETNAM.Indd

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

33rd International Gemmological Conference IGC October 2013 Hanoi, Vietnam 33rd IGC 2013 - Hanoi, Vietnam Introduction 33rd International Gemmological Conference IGC October, 2013 Hanoi, Vietnam Distinguished Participants of the 33rd IGC Conference in Hanoi, Vietnam On behalf of Vietnam National University, Hanoi (VNU), I am pleased to extend my warmest welcome to all of you to the 33rd International Gemmological Conference (IGC). Following the great success of the 32nd IGC which was co-organized by Swiss Gemmological Institute (SSEF) in 2011, VNU is honored to cooperate with DOJI Gold & Gems Group to host this year’s conference in the thousand-year-old capital city of Hanoi in its most beautiful season. As you may know, Vietnam is endowed with a diversity of gem minerals thanks to its geologic position along the mar- gins of two cratons. However, Vietnam’s mining and pearl farming sectors are still relatively small and undeveloped, leaving many potential resources unexploited. While being the leading university in Vietnam with an important role in scientific development, VNU finds this both an opportunity and responsibility in promoting the studies on gemmolo- gy, contributing to develop this potential industry of the country. Besides, we also need the practical experiences and support from other countries around the world, especially those with developed gemstone industries and research. For those reasons, we find the great necessity to hold this important event in Vietnam. Aiming at going to the heart of all matters relating to gemstones and endeavoring to exchange every knowledge and experience in gemmology, this year’s conference will bring together the leading scientists, researchers, practitioners, managers and elite businessmen from around the world. I expect that you can gain lots of gemological inputs for your own gemological research and work as well as unforgettable experiences during your time in Vietnam. On behalf of my co-chairman, Dr. Do Minh Phu – President of DOJI Gold & Gems Group, I wish you a memorable and enriching conference. August 2013 Phung Xuan Nha, Prof. Dr President of Vietnam National University, Hanoi 2 33rd IGC 2013 - Hanoi, Vietnam Introduction About the organising Committee for the 33rd IGC Conference: International Organisers Phung Xuan Nha, Vietnam National University, Hanoi: Chairman Do Minh Phu, DOJI Gold & Gems Group: Co-chairman Nguyen Ngoc Khoi, Vietnam National University, Hanoi; and DOJI Gold & Gems Group Le Thi Thu Huong, Vietnam National University, Hanoi Michael S. Krzemnicki, Swiss Gemmological Insitute SSEF Laurent E. Cartier, Swiss Gemmological Institute SSEF Jayshree Panjikar, Panjikar Gem Research & Tech Institute IGC Executive Committee Local Organisers Nguyen Huu Duc, Vietnam National University, Hanoi: Chairman Do Vu Phuong Anh, DOJI Gold & Gems Group: Co-chairlady Le Thi Thu Huong, Vietnam National University, Hanoi Nguyen Ngoc Khoi, Vietnam National University, Hanoi; and DOJI Gold & Gems Group Duong Anh Tuan, DOJI Gold & Gems Group Bui Duy Cam, Vietnam National University, Hanoi Nguyen Anh Thu, Vietnam National University, Hanoi Dinh Van Huong, Vietnam National University, Hanoi Nguyen Van Vuong, Vietnam National University, Hanoi Nguyen Thanh Quang, DOJI Gold & Gems Group Local planning & Social programme Le Thi Thu Huong, Vietnam National University, Hanoi Do Vu Phuong Anh, DOJI Gold & Gems Group Abstract Review Board Urich Henn, German Gemmological Institute Hanco Zwaan, Netherland Gemmological Institute Emmanuel Fritsch, University of Nantes Layout & Editing & Website Laurent Cartier, Swiss Gemmological Insitute SSEF Special thanks to - IGC Excutive Boards for giving us the opportunity to hold the conference - Abstract review board for their tremendous work finalizing and reviewing the abstracts. - Michael Krzemnicki, SSEF for his advices and Laurent Cartier, SSEF, Le Thi Thu Huong, VNU for layout and editing the website and Conference proceedings. August 2013, Phung Xuan Nha 3 33rd IGC 2013 - Hanoi, Vietnam Introduction About the IGC Executive Board Photo of the IGC Executive Board, taken in July 2011 in Interlaken (Switzerland): (From left to right) John Koivula, Hanco Zwaan, Emmanuel Fritsch, Gamini Zoysa, Henry A. Hänni, Jayshree Panjikar, Tay Thye Sun, John Saul, George Bosshart (†), Michael S. Krzemnicki. Long-standing Board members Dr. Jan Kanis, Mr. Alan Jobbins are also on this picture. Pre-conference excursion: 10-12 October 2013. Hanoi – Halong Bay – Catba arquipelago – Hanoi Conference: 12-16 October 2013. Hanoi, Vietnam. Post-conference excursion: 17-19 October 2013. Gem Mining Areas in Yen Bai Province Guest programme: 12-16 October 2013. Hanoi, Vietnam 4 33rd IGC 2013 - Hanoi, Vietnam Introduction About the venue Hanoi Hanoi is the crowded capital city of Vietnam. The site where Hanoi stands today has been inhabited since the Neolithic period. Emperior Ly Thai To moved his capital here in AD1010 naming it Thang Long meaning Soaring Dragon. Specta- cular celebrations in honour of the 1000th birthday of the city had taken place 2010. The elegant heart of Hanoi is centred on the Hoan Kiem lake. Just north to this lake is the Old Quarter which is charac- terised by narrow streets. Participants visiting Hanoi may discover Vietnam not only in its modern life but also its past. Hoan Kiem lake is the most centred and one of the major sce- nic spots of Hanoi and serves as a focal point for its public life. The Conference Venue The Conference is held at the Lake Side hotel. We choose Lake Side hotel to host the conference because it is a beau- tiful and peaceful hotel beside the romantic sight of Giang Vo lake. The location is convenient not only for visitor but also for transportation. With 02 high standard restaurant system (Royal Vietnamese restaurant & Azuma Japanese restaurant), peaceful space, beside serving coffee during coffee breaks the hotel will offer lunch during lunch breaks. 5 33rd IGC 2013 - Hanoi, Vietnam Introduction About the Sponsors Vietnam National University, Hanoi Vietnam National University, Hanoi (VNU) is the first modern university ever establish in the country and one of the two national universities in Vietnam. VNU has undergone various stage of development: the University of Indochina established on 16 May 1906; Vietnam National University (November, 1945); the University of Hanoi (June, 1956). In December 1993, VNU was reorganized on the basis of amalgamating the University of Hanoi and other leading univer- sities in Hanoi. VNU holds a special position in Vietnam’s higher education system, operating according to special regulation promul- gated by the Prime Minister. VNU has its Headquarter at Xuan Thuy street, 3 old campuses inside Hanoi centre and a new one which is 30 km far from the centre of Hanoi. Hoa Lac – the new campus with an area of 1000 hectares in Thach That district which is 40 km far from the centre of Hanoi One of old campuses of VNU inside Hanoi old town – Le Thanh Tong campus DOJI Gold and Gems Group Originally known as TTD Technology and Trading Development Company, DOJI Gold & Gems Group has spectacularly expanded its business not only in Gold & Gems mining, Gems cutting & processing, Jewelry manufacturing, Gold bar trade, Gold import & export and Jewelry boutiques & shops nationwide network, Invest in service industry, real estate, banking and finance. Up to now, DOJI Gold & Gems Group has owned six member subsidies, five association com- panies and twelve branches. DOJI Group established its own DOJI Institute & Laboratory For Gemology And Jewelry (DOJILAB) reputing in Vietnam. DOJILAB has been equipped with the latest advanced analytical and testing instru- ments. Besides its qualified gemologists, DOJILAB is also collaborated with the top grading labs and scientists from national and international universities and institutes. As the only Vietnamese representative of the International Colored Gemstone Association (ICA) and being honored as “the King of Star Ruby” for its Vietnam Star Ruby (VSR), DOJI Gold & Gems Group has launched its distinguished products to international markets such as Japan, Thailand, India, Hong Kong and Taiwan. DOJI Gold & Gems Group has remarkably contributed to pinpoint Vietnam on the gemstone world map. The Group is proud to be the owner of the most precious stones exploited in Vietnamese mines, namely Dai Lam Ngoc – a 15-ton giant blue sapphire, Bao Hong Ngoc – the most precious natural rough Star Ruby of 18.88 kg and notably the Emperor Star Ruby well known in Vietnam and the world. DOJI Gold & Gems Group has been strongly developed to reach the goal of becoming a leading Group in Vietnam and further, a prestigious brand in the world. 6 33rd IGC 2013 - Hanoi, Vietnam Conference Programme IGC 2013 Programme Interlaken, Switzerland 12-16 October 2013 Saturday 12 October 18.00-20.30 IGC Welcome reception in Hanoi at the Lake Side Hotel 20.30-22.00 Executive Committee (EXCO) reunion Sunday 13 October 9.00-9.15 Opening Ceremony and Announcements 9.15-9.30 Greeting speech by VNU president 9.30-9.45 Greeting speech by DOJI president 9.45-10.00 Speech from IGC EXCO 10.00-10.15 Conference photo 10.15-10.30 Coffee Break Corundums (Chairman Emmanuel Fritsch) 10.30-10.50 J.C. (Hanco) Zwaan, Eric Buter, Robert E. Kane: Mineral inclusions in alluvial sapphires from Montana - an update 10.50-11.10 M.A. Viktorov, A. D. Semina, M. I. Pshenichny: Sapphires from Koltashi deposits (Ural Mountains, Russia) 11.10-11.30 Dietmar Schwarz, Stefanos Karampelas, Lu Taijin, Claudio C. Milisenda: Kenya,
Recommended publications
  • Magnetic Susceptibility Index for Gemstones ©2010 Kirk Feral Magnetic Responses Are Standardized to 1/2" X 1/2" N-52 Magnet Cylinders

    Magnetic Susceptibility Index for Gemstones ©2010 Kirk Feral Magnetic Responses Are Standardized to 1/2" X 1/2" N-52 Magnet Cylinders

    Magnetic Susceptibility Index for Gemstones ©2010 Kirk Feral Magnetic responses are standardized to 1/2" X 1/2" N-52 magnet cylinders. Colorless and extremely pale stones of any species tend to be Inert (diamagnetic). Black opaque stones of many species are strongly magnetic and may Pick Up or Drag. Pick Up and Drag responses are weight-dependent. Direct responses on the Index apply to gems 1-4cts. Larger gems may be too heavy to Pick Up or Drag. Smaller non-Garnet gems with strong magnetism may Pick Up. Gemstone Response Range SI X 10 (-6) Range Cause of Color Actinolite Nephrite Jade (black) Strong to Drags 321-577 Iron Nephrite Jade (green) Moderate to Drags 91-343 Iron, Chromium Nephrite Jade (white, yellow) Inert < 0 (diamagnetic) Iron Pargasite (green) Inert < 0 (diamagnetic) Iron, Vanadium Pargasite (orangey brown) Weak 35 SI Iron Afghanite (blue) Inert < 0 (diamagnetic) Chromium, Vanadium Amber (any color) Inert < 0 (diamagnetic) Charge Transfer involving Organic Compounds Amblygonite-Montebrasite (blue, green) Inert < 0 (diamagnetic) Iron, Manganese Andalusite Inert to Weak < 0 -26 Iron-Oxygen-Titanium Charge Transfer Apatite Transparent blue, green, yellow Inert (Weak in rare cases) < 0 (diamagnetic) Mang., Rare-earth, Charge Transfer, Color Centers Yellow, yellowish brown Weak to Strong < 20 - >120 Rare-earth Metals Astrophyllite Strong 1146-1328 Iron, Manganese Axinite (pale to dark) Drags 309-616 SI Iron Azurite (opaque) Strong 382 SI Copper Barite (pale brown, blue) Inert < 0 (diamagnetic) Color Centers Bastnasite (pale
  • Volume 20 / No. 7-8 / 1987

    Volume 20 / No. 7-8 / 1987

    Volume 20 Nos. 7 & 8 July & October 1987 TheJournal of Gemmology GEMMOLOGICAL ASSOCIATION OF GREAT BRITAIN OFFICERS AND COUNCIL President: *Sir Frank Claringbull, Ph.D., F.lnst.P., FGS Vice-Presidents: J. R. H. Chisholm, M.A., FGA R. K. Mitchell, FGA Chairman: *D. J. Callaghan, FGA Vice-Chairman: *N. W. Deeks, FGA Honorary Treasurer: *N. B. Israel, FGA Members elected to Council: *A. J. Allnutt, M.Sc., J. A. W. Hodgkinson, FGA *J. B. Nelson, Ph.D., Ph.D., FGA D. Inkersole, FGA FRMS, F.Inst.P., FGA *E. M. Bruton, FGA B. Jackson, FGA W. Nowak, C.Eng., *C. R. Cavey, FGA *E. A. Jobbins, B.Sc., C.Eng., F.R.Ae.S., FGA L. F. Cole, FGA FIMM, FGA M. J. Q'Donoghue, P. J. E. Daly, B.Sc., C. B. Jones, FGA MA, FGS, FGA FGA *G. H. Jones, B.Sc., Ph.D., *P. G. Read, C.Eng., *A. E. Farn, FGA FGA MIEE, MIERE, FGA A. J. French, FGA D.G.Kent,FGA A. W. R. Round, FGA *R. R. Harding, B.Sc., D. M. Larcher, FGA E. Stern, FGA D.Phil, FGA D. Morgan, FGA *C. H. Winter, FGA J. W. Harris, B.Sc., M.Sc., Ph.D. * Members of the Executive Committee Branch Chairmen: Midlands Branch: P. J. West, FGA North-West Branch: S. G. Hill, FGA South Yorkshire & District Branch: G. A. Massie~ FGA Examiners: A. J. Allnutt, M.Sc., Ph.D., FGA D. G. Kent, FGA E. M. Bruton, FGA P. Sadler, B.Sc., FGS, FGA A. E. Farn, FGA K.
  • Spring 2000 Gems & Gemology

    Spring 2000 Gems & Gemology

    SPRING 2000 VOLUME 36 NO. 1 TABLE OF CONTENTS EDITORIAL 1 Breakthrough Technology William E. Boyajian FEATURE ARTICLES 2 Burmese Jade: The Inscrutable Gem Richard W. Hughes, Olivier Galibert, George Bosshart, Fred Ward, Thet Oo, Mark Smith, Tay Thye Sun, and George E. Harlow pg. 4 28 Lapis Lazuli from the Coquimbo Region, Chile Robert R. Coenraads and Claudio Canut de Bon NOTES AND NEW TECHNIQUES 42 Spectroscopic Evidence of GE POL HPHT-Treated Natural Type IIa Diamonds David Fisher and Raymond A. Spits 50 Purple to Purplish Red Chromium-Bearing Taaffeites Karl Schmetzer, Lore Kiefert, and Heinz-Jürgen Bernhardt REGULAR FEATURES 60 Gem Trade Lab Notes 66 Gem News pg. 35 79 The Dr. Edward J. Gübelin Most Valuable Article Award pg. 43 81 Gems & Gemology Challenge 83 Book Reviews 85 Gemological Abstracts 93 Guidelines for Authors ABOUT THE COVER: Jadeite has long been the most prized gem in the Far East, par- ticularly China. The primary source of top-grade material lies in the remote jungles of pg. 51 Burma (now Myanmar). The lead article in this issue, written by the first foreign gemologists allowed access to Myanmar’s jadeite mines in over 30 years, reports on current activity at these mines and the evaluation of rough and fashioned jadeite. These pieces, set with diamonds, illustrate the special quality of Myanmar jadeite. The carving is approximately 4.9 cm high, the butterfly is 8.5 cm wide from wing tip to wing tip; the earrings are 17 mm in diameter, and the oval cabochon is about 15 mm × 11 mm.
  • The Gemstone Book

    The Gemstone Book

    © CIBJO 2018 All rights reserved GEMSTONE COMMISSION 2018 - 1 2018-1 2018-1-1 CIBJO/Coloured Stone Commission The Gemstone Book CIBJO standard E © CIBJO 2018. All rights reserved COLOURED STONE COMMISSION 2018-1 Foreword .................................................................................................................................... iv Introduction ............................................................................................................................... vi 1. Scope ................................................................................................................................. 8 2. Normative references .......................................................................................................... 8 3. Classification of materials .................................................................................................... 9 3.1. Natural materials ........................................................................................................... 9 Only materials that have been formed completely by nature without human interference/intervention qualify as “natural” within this standard. ........................................... 9 3.1.1. Gemstones ................................................................................................................................... 9 3.2. Artificial products ........................................................................................................... 9 3.2.1. Artificial products with gemstone components
  • A NEW GEM MATERIAL from GREENLAND: IRIDESCENT ORTHOAMPHIBOLE by Peter W Uitterdijli Appel and Aage Jensen

    A NEW GEM MATERIAL from GREENLAND: IRIDESCENT ORTHOAMPHIBOLE by Peter W Uitterdijli Appel and Aage Jensen

    NOTES NEW TECHNIQUES A NEW GEM MATERIAL FROM GREENLAND: IRIDESCENT ORTHOAMPHIBOLE By Peter W Uitterdijli Appel and Aage Jensen Orthoomphiboles wiih pronounced iridescence are After the initial discovery, the authors con- found in eight localities in the vicinity of Nuuk, the ducted an investigation of the gemstone. It was capital of Greenland. The iridescence, difficult to see decided, however, that the results should not be on rough samples, becomes clearly visible when the published internationally before a commercial material is cut. This iridescent orthoamphibole is production had started. Inasmuch as the material mined by a company wholly owned by Nuuk com- was recently introduced on the jewelry marlzet in mune, and is sold under the trade name Nuummite. This orthoamphibole has a composition similar to Greenland under the trade name Nuummite, we that of iridescent orthoamphiboles described earlier are now able to provide the gemological commu- from Greenl~ndas well as from New Hampshire and nity with the following information on the loca- Massachusetts, but is believed to be the first such or- tion and occurrence of the material, its appear- thoamphibole to be regarded as a gemstone. ance, chemistry, and gemological properties, and the lapidary and commercial aspects. LOCATION AND OCCURRENCE In the early 1980s, the Geological Survey of Greenland had several geologists working the To date, the iridescent orthoamphiboles have been Nuulz area of West Greenland. The first-named found in eight localities within 50 lzm (approx- author joined the field worlz in 1982, and devoted imately 30 mi.) of Nuulz, the capital of Greenland. his attention to mineral deposits.
  • Suomen Korukivet

    Suomen Korukivet

    Kansi: Lapin kultahipuista ja ametisteista valmistettu koru; valmistaja: Aarne Alhonen Cover: Jewellery made of gold nuggets and amethysts from Finnish Lapland; manufacturer: Aarne Alhonen Kannen kuva | Cover photo: Jari Väätäinen, GTK Kustannustoimittaja | Publishing editor: Anu Karanko Ulkoasu ja taitto | Graphic design and layout: Antero Airos Painopaikka | Printing house: Lönnberg Print & Promo, Finland ISBN 978-952-217-253-2 (sid.) ISBN 978-952-217-254-9 (PDF) © Geologian tutkimuskeskus | Geological Survey of Finland Espoo 2017 SUOMEN KORUKIVET Gemstones of Finland Kari A. Kinnunen Risto Vartiainen Satu Hietala Seppo I. Lahti Marja Lehtonen Pasi Heikkilä Jorma Valkama Pekka Huhta Esipuhe dellinen suomalaisista korukivistä kertova kirja ilmestyi lähes 20 vuotta sitten. Uusia löytöjä on sen jälkeen tehty vuosittain. Niistä on kirjoitettu vain suomen- Ekielellä ja yleensä kivikerhojen pienilevikkisissä julkaisuissa. Uuden kirjan laati- minen tuli siksi ajankohtaiseksi. Kirja on kaksikielinen, sillä englanniksi aiheesta on aiem- min kirjoitettu vain muutamia artikkeleja. Suomelle uusia jalokivilöytöjä ovat kirjassa esitellyt rubiinit, safiirit ja smaragdit. Myös- kään Kaavin Lahtojoen kimberliitin timanttikiteitä ei kirjoissa ole aikaisemmin kunnolla kuvattu. Lisäksi kivilajeja, joita Suomessa käytetään yleisesti koruissa, on esitelty kattavasti. Valokuvausmenetelmät ovat kehittyneet viime vuosikymmenen aikana valtavasti, ja kivinäytteiden digikuvaus tuottaa tasokkaampaa jälkeä kuin aikoinaan 35 mm:n filmi- kamerat. Kirjan kuvat ovat siksi pääosin uusia digikuvia, vaikka historiallisiakin kuvia on mukana. Osa kuvista on toteutettu kerroskuvauslaitteistolla GTK:n Kuopion toimipis- teen kuvalaboratoriossa. Kirjassa esitellyt korukiviesiintymät osoittavat, että Suomesta on löydetty enemmän korukiviesiintymiä kuin muista Pohjoismaista. Tämä on yllättävää, sillä varsinkin Suo- men ja Ruotsin kallioperä on melko samankaltaista. Selittävä tekijä voi olla etsinnän suuri aktiivisuus Suomessa: kiviharrastajia on tuhansia ja jopa muutamat geologit ovat korukiviharrastajia.
  • Understanding Gems

    Understanding Gems

    GemmologyThe Journal of Volume 35 / No. 4 / 2016 The Gemmological Association of Great Britain Contents GemmologyThe Journal of Volume 35 / No. 4 / 2016 COLUMNS p. 321 271 What’s New DiaPix Jewelry Imaging|DiaTrue screening system|GemTrue Ex- p. 287 perior tester|GLIS-3000 GEM Lu- minous Imaging System|J-Secure synthetic diamond detector|Solico and Synova diamond-cutting machines|CIBJO Congress 2016 presentations and special reports|GIT Lab Updates|USA lifts ban on Burmese ruby and jadeite|Margaritologia news- letter|David Friend Hall at the Yale Peabody Museum|Harvard ARTICLES Museum virtual tour|‘Jades for Life and Death’ online Feature Articles 294 Ruby and Pink Sapphire from Aappaluttoq, Greenland 274 Practical Gemmology By Christopher P. Smith, Andrew J. Fagan and Bryan Clark Anomalous behaviour of a Sumitomo synthetic diamond 308 Geology, Gemmological Properties and Preliminary on the reflectance meter Heat Treatment of Gem-Quality Zircon from the 276 Gem Notes Central Highlands of Vietnam Antigorite serpentine from north- By Le Thi-Thu Huong, Bui Sinh Vuong, Nguyen Thi Minh western Pakistan|‘Black’ axinite| Thuyet, Nguyen Ngoc Khoi, Somruedee Satitkune, Bhuwadol Beryl from Tanzania with phena- kite inclusions|Clinohumite from Wanthanachaisaeng, Wolfgang Hofmeister, Tobias Häger and Vietnam|Lace opal from Utah, Christoph Hauzenberger USA|Pollucite from Pakistan with polylithionite inclusions|Large 320 Identification of Reconstructed Amber from Different ruby matrix from Lu.c Yên, Periods Vietnam|Scapolite from Badakh- By Haibo Li,
  • Spring 2000 Gems & Gemology Gem News

    Spring 2000 Gems & Gemology Gem News

    Editors • Mary L. Johnson, John I. Koivula, Shane F. McClure, and Dino DeGhionno GIA Gem Trade Laboratory, Carlsbad, California Contributing Editors Emmanuel Fritsch, IMN, University of Nantes, France Henry A. Hänni, SSEF, Basel, Switzerland Karl Schmetzer, Petershausen, Germany TUCSON 2000 The kaleidoscope of gems that is Tucson showed many Wentzell and Gem News editor MLJ an amphibole rock more colors this year than we have seen for some time, marketed as “Siberian blue nephrite” (also called and most of the shows were far more successful than in “Dianite” in Russia). The material ranges from mottled previous years. Although it is impossible to report the saturated “royal” or “lapis” blue to a mottled desaturat- full range of items seen by the Gem News editors and ed grayish blue (figure 1) similar to “denim” lapis (see, their colleagues, following are some of the new, different, e.g., Fall 1993 Gem News, p. 210). First discovered and more plentiful gem materials they encountered. around 1994, this material has been recovered since 1997 as a byproduct of nephrite jade mining in Sakha COLORED STONES AND ORGANIC MATERIALS (formerly Yakutia), central Siberia. Rough is sold as Amphiboles are not necessarily jade. Jonathan and Meagan blocks up to 20 cm across; cabochons typically weigh 15 Passel of Natural Selection, Austin, Texas, showed GIA to 50 ct. About 200–300 kg per year of “gem-quality” Gem Trade Laboratory Senior staff gemologist Cheryl material is produced. An electron microprobe analysis of this material, per- formed at the University of Texas at Austin and summa- rized in literature provided by the Passels, stated that the rock is composed of a submicroscopic mixture of quartz, Figure 1.
  • Fall 2011 Gems & Gemology

    Fall 2011 Gems & Gemology

    2011 ALL F Pallasitic Peridot Pallasitic Vietnamese Ruby and Sapphire CVD Synthetic Diamond and Amethyst Identification Synthetic Diamond Stamp Collection XLVII OLUME V GEMS & GEMOLOGY FALL 2011 PAGES 181–258 VOLUME 47 NO. 3 Because Public Education Happens At The Counter. GIA’s Retailer Support Kit and website EPHRAIM ZION of Dehres Limited handles more diamonds in a day than most people see in a lifetime. Here he discusses the power of reputation, global diamond investment and why a GIA report is vital to any business built on integrity. A $97.00 value, shipping and handling extra. What’s something most people don’t know about your job? It’s the only business in the world conducted on trust. You sell 1 to 5 million dollars just on the telephone, without even a signature. A diamond dealer’s most valuable asset? Reputation. Yes, you need a sense of artistic value and a knack for design, but GIA’s Retailer Support Kit has been developed to help the most essential part is integrity. You can’t survive without it. sales associates educate the public about diamonds, What has doing business in Hong Kong taught you about the Asian market? It’s one of the strongest in the world. Every day, there are new millionaires and new businesses. Asians are very investment-conscious. Diamonds are safer and more the 4Cs, and thoroughly explain a GIA grading report. profi table than money in a bank. Take full advantage of all that GIA has to off er by visiting All-time favorite purchase? Most recently, a 100+ ct.
  • Magnetic Susceptibility Index for Gemstones ©2010 Kirk Feral Magnetic Responses Are Standardized to 1/2" X 1/2" N-52 Magnet Cylinders

    Magnetic Susceptibility Index for Gemstones ©2010 Kirk Feral Magnetic Responses Are Standardized to 1/2" X 1/2" N-52 Magnet Cylinders

    Magnetic Susceptibility Index for Gemstones ©2010 Kirk Feral Magnetic responses are standardized to 1/2" X 1/2" N-52 magnet cylinders. Colorless and extremely pale stones of any species tend to be Inert (diamagnetic). Black opaque stones of many species are strongly magnetic and may Pick Up or Drag. Pick Up and Drag responses are weight-dependent. Direct responses on the Index apply to gems 1-4cts. Larger gems may be too heavy to Pick Up or Drag. Smaller non-Garnet gems with strong magnetism may Pick Up. Gemstone Response Range SI X 10 (-6) Range Cause of Color Actinolite Black Nephrite Jade Strong 321 SI Iron Green Nephrite Jade Moderate to Strong 91-312 Iron White/Yellow Nephrite Jade Inert < 0 (diamagnetic) none, some Iron Green Pargasite Inert < 0 (diamagnetic) Iron, Vanadium? Orangey brown Pargasite Weak 35 SI Iron Afghanite (blue) Inert < 0 (diamagnetic) Chromium, Vanadium Amber (any color) Inert < 0 (diamagnetic) Organic Amblygonite (blue) Inert < 0 (diamagnetic) Unknown Andalusite Inert to Weak < 0 -26 Manganese Apatite (any color) Inert (Weak in rare cases) < 0 (diamagnetic) Manganese, Rare-earth Astrophyllite Strong 1146-1328 Iron, Manganese Axinite Drags 603 SI Iron, Manganese Azurite (opaque) Strong 382 SI Copper Barite (pale brown) Inert < 0 (diamagnetic) Unknown Bastnasite Drags (Picks Up under 1ct) 773-803 SI Cerium (rare-earth) Benitoite Inert < 0 (diamagnetic) Iron-Titanium intervalence charge transfer Beryl Aquamarine (pale to medium blue) Weak to Moderate 20-100 Iron Golden / Yellow Beryl Inert to Weak < 0-48 Iron Heliodor
  • The Gemstone Book

    The Gemstone Book

    2012-1 2012-12-30 cIBJO/Coloured Stone Commission The Gemstone Book Gemstones, Organic Substances & Artificial Products — Terminology & Classification (Including precious stones, gemstones, ornamental stones, organic substances, stones requiring general and specific information on their modifications, synthetic stones, artificial stones and imitations) CIBJO standard E © CIBJO 2012. All rights reserved. COLOURED STONE COMMISSION 2012-1 Table of Contents Table of Contents .................................................................................................................. 2 Foreword ............................................................................................................................... 3 Introduction ........................................................................................................................... 5 1 Scope ............................................................................................................................ 6 2 Normative references ..................................................................................................... 6 3 Classification of materials ............................................................................................... 6 4 Normative Clauses ......................................................................................................... 7 5 Terms and Definitions .................................................................................................. 18 Annex A (normative) Commercial Names ..........................................................................
  • Magnetic Susceptibility Index for Gemstones ©2010 Kirk Feral Magnetic Responses Are Standardized to 1/2" X 1/2" N-52 Magnet Cylinders

    Magnetic Susceptibility Index for Gemstones ©2010 Kirk Feral Magnetic Responses Are Standardized to 1/2" X 1/2" N-52 Magnet Cylinders

    Magnetic Susceptibility Index for Gemstones ©2010 Kirk Feral Magnetic responses are standardized to 1/2" X 1/2" N-52 magnet cylinders. Colorless and extremely pale stones of any species tend to be Inert (diamagnetic). Black opaque stones of many species are strongly magnetic and may Pick Up or Drag. Pick Up and Drag responses are weight-dependent. Direct responses on the Index apply to gems 1-4cts. Larger gems may be too heavy to Pick Up or Drag. Smaller non-Garnet gems with strong magnetism may Pick Up. Gemstone Response Range SI X 10 (-6) Range Cause of Color Actinolite Black Nephrite Jade Strong 321 SI Iron Green Nephrite Jade Moderate to Strong 91-312 Iron White/Yellow Nephrite Jade Inert < 0 (diamagnetic) none, some Iron Green Pargasite Inert < 0 (diamagnetic) Iron, Vanadium Orangey brown Pargasite Weak 35 SI Iron Afghanite (blue) Inert < 0 (diamagnetic) Chromium, Vanadium Amber (any color) Inert < 0 (diamagnetic) Organic Amblygonite-Montebrasite (blue, green) Inert < 0 (diamagnetic) Iron, Manganese Andalusite Inert to Weak < 0 -26 Manganese Apatite (any color) Inert (Weak in rare cases) < 0 (diamagnetic) Manganese, Rare-earth Astrophyllite Strong 1146-1328 Iron, Manganese Axinite Drags 603-616 SI Iron, Manganese Azurite (opaque) Strong 382 SI Copper Barite (pale brown) Inert < 0 (diamagnetic) Unknown Bastnasite Drags (Picks Up under 1ct) 773-898 SI Cerium (rare-earth) Benitoite Inert < 0 (diamagnetic) Iron-Titanium intervalence charge transfer Beryl Aquamarine (pale to medium blue) Weak to Moderate 20-100 Iron Golden / Yellow Beryl