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Spring 2010 Gems & Gemology

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Spring 2010 Gems & Gemology G EMS & G VOLUME XLVI SPRING 2010 EMOLOGY S PRING 2010 P AGES 1–78 Intense Pink CVD Synthetic Diamonds Impact of Heat and UV on CVD Synthetics V OLUME “Sister” Stones to the Hope? Confocal Raman to Identify Emeralds 46 Bastnäsite and Parisite from Malawi N O. 1 THE QUARTERLY JOURNAL OF THE GEMOLOGICAL INSTITUTE OF AMERICA OUR EDUCATION. YOUR WORLD OF OPPORTUNITY. Because Public Education Happens at the Counter. SEOUL 8:00 PM GIA launches Retailer Support Kit and website LONDON GIA alumni network at cultured pearl seminar. NOON GIA-trained jeweler advises client on 5 carat solitaire. NEW YORK 7:00 AM Diamonds Graduate negotiates purchase of rough parcel. TOKYO 8:00 PM CARLSBAD Student completes gem ID project. 4:00 AM MUMBAI 4:30 PM Core gem curriculum updated Sales associate explains 4Cs to customer. to reflect new research. HONG KONG 7:00 PM Manufacturing exec expands business skills online. BANGKOK 6:00 PM Graduate Gemologist spots treated emeralds in bulk order. A $97.00 value, shipping and handling extra. Almost anywhere you go, someone is using education acquired from GIA. Our international campuses, traveling classes, GIA’s Retailer Support Kit has been developed to help corporate seminars and online courses help individuals define and refine vital skills. sales associates educate the public about diamonds, And GIA supports that learning with credentials valued throughout the gem and jewelry world. the 4Cs, and thoroughly explain a GIA grading report. WWW.GIA.EDU Take full advantage of all that GIA has to offer by visiting www.retailer.gia.edu To order your FREE kit, log on to www.retailer.gia.edu CARLSBAD NEW YORK LONDON ANTWERP FLORENCE GABORONE JOHANNESBURG MOSCOW MUMBAI BANGKOK HONG KONG BEIJING TAIPEI SEOUL OSAKA TOKYO GMSGG RTGG08 Spring 2010 ® Volume 46, No. 1 EDITORIAL _________________ 1 The Dr. Edward J. Gübelin Most Valuable Article Award FEATURE ARTICLES __________________ 4 Strongly Colored Pink CVD Lab-Grown Diamonds Wuyi Wang, Patrick Doering, Joshua Tower, Ren Lu, Sally Eaton-Magaña, Paul Johnson, Erica Emerson, and Thomas M. Moses A new generation of CVD lab-grown diamonds from Apollo Diamond Inc. 18 Color Alterations in CVD Synthetic Diamond with Heat and UV Exposure: Implications for Color Grading and Identification pg. 5 Carat Points Rizwan U. A. Khan, Philip M. Martineau, Bradley L. Cann, Mark E. Newton, Harpreet K. Dhillon, and Daniel J. Twitchen Nonpermanent color changes may occur in as-grown CVD synthetic diamonds when exposed to heat or UV radiation. NOTES & N EW TECHNIQUES ______________ 28 Possible “Sister” Stones of the Hope Diamond Scott D. Sucher, Stephen W. Attaway, Nancy L. Attaway, and Jeffrey E. Post Computer modeling is used to investigate the possibility that sister stones to the Hope diamond resulted from the cutting of the Tavernier Blue or French Blue. 36 Confocal Micro-Raman Spectroscopy: A Powerful Tool to Identify Natural and Synthetic Emeralds Le Thi-Thu Huong, Tobias Häger, and Wolfgang Hofmeister pg. 22 Describes a nondestructive analytical technique for differentiating natural from synthetic emeralds and investigating geographic origin. 42 Bastnäsite-(Ce) and Parisite-(Ce) from Mt. Malosa, Malawi Alessandro Guastoni, David Kondo, and Fabrizio Nestola Characterizes faceted samples of these rare brownish orange minerals. REGULAR FEATURES _________________________ 48 Lab Notes Coated and fracture-filled orangy red diamond • Diamond with green fluorescence • Irradiated black diamonds • Large HPHT-treated type IIb blue • Pink diamonds colored by multiple processes • Type IIa greenish yellow diamond colored by IR-inactive nitrogen • Red CVD synthetic diamond with multiple treatments • Exceptionally transparent treated jadeite • Large natural freshwater pearls • Growth tubes in tourmaline • Treated green turquoise 58 Gem News International Tucson 2010 • Ametrine from the Yuruty mine, Bolivia • Andradite from China • Barite from Brazil • Gem hanksite • Lepidolite beads • “Soufflé” freshwater cultured pearls • “Churrasco quartz” from Brazil • Cat’s-eye rhodonite • Large H-rich diamond • Diopside from Madagascar • Garnet and zircon from the Solomon Islands • Tsavorite mining at Namalulu, northern Tanzania • Treated CVD-grown pink synthetic diamond melee • Be-diffused sapphire • Dyed conch shell beads • Unusual gemstone tapestry 73 Letters 74 2010 Gems & Gemology Challenge 76 Guidelines for Authors S1 Book Reviews S4 Gemological Abstracts pg. 67 gia.edu/gandg EDITORIAL Editor-in-Chief Editor Editors, Lab Notes STAFF Alice S. Keller Brendan M. Laurs Thomas M. Moses [email protected] Gemological Institute of America Shane F. McClure The Robert Mouawad Campus Managing Editor 5345 Armada Drive Editor, Gem News International Thomas W. Overton Carlsbad, CA 92008 Brendan M. Laurs [email protected] (760) 603-4503 Associate Editor [email protected] Editors, Book Reviews Stuart D. Overlin Susan B. Johnson Circulation Coordinator [email protected] Jana E. Miyahira-Smith Martha Rivera Thomas W. Overton Technical Editor (760) 603-4000, ext. 7142 Carol M. Stockton [email protected] Editors, Gemological Abstracts Contributing Editor Brendan M. Laurs James E. Shigley Thomas W. Overton PRODUCTION Art Director Image Specialist G&G Online: STAFF Nanette Newbry, Studio 2055 Kevin Schumacher gia.metapress.com EDITORIAL Ahmadjan Abduriyim Emmanuel Fritsch Robert E. Kane Kenneth Scarratt Tokyo, Japan Nantes, France Helena, Montana Bangkok, Thailand REVIEW BOARD Shigeru Akamatsu Jaroslav Hyr`´sl Lore Kiefert James E. Shigley Tokyo, Japan Prague, Czech Republic Lucerne, Switzerland Carlsbad, California Edward W. Boehm A. J. A. (Bram) Janse Michael S. Krzemnicki Christopher P. Smith Chattanooga, Tennessee Perth, Australia Basel, Switzerland New York, New York James E. Butler E. Alan Jobbins Thomas M. Moses Wuyi Wang Washington, DC Caterham, UK New York, New York New York, New York Alan T. Collins Mary L. Johnson Mark Newton Christopher M. Welbourn London, UK San Diego, California Coventry, UK Reading, UK John L. Emmett Anthony R. Kampf George R. Rossman Brush Prairie, Washington Los Angeles, California Pasadena, California SUBSCRIPTIONS Copies of the current issue may be purchased for $29.95 plus shipping. Online subscriptions are $74.95 for one year (4 issues), $129.95 for two years (8 issues). Combination print + online subscriptions are $139.95 in the U.S. and $160 elsewhere for one year, and $269.95 in the U.S. and $305 elsewhere for two years. Canadian subscribers should add GST. Discounts are available for group subscriptions, renewals, GIA alumni, and current GIA students. For institutional rates, go to gia.edu/gandg. Subscriptions include G&G’s monthly gemological e-newsletter, the G&G eBrief. To purchase subscriptions and single issues (print or PDF), visit store.gia.edu or contact the Circulation Coordinator. PDF versions of individual articles and sections from Spring 1981 forward can be purchased at gia.metapress.com for $12 each. Visit gia.edu/gandg for free online access to the 1934–2009 subject and author index and all 1934–1980 issues. To obtain a Japanese translation of Gems & Gemology, contact GIA Japan at [email protected]. Our Canadian goods and service registration number is 126142892RT. Gems & Gemology’s impact factor is 1.172 (ranking 12th out of the 26 journals in the Mineralogy category), according to the DATABASE Thomson Reuters 2008 Journal Citation Reports (issued July 2009). Gems & Gemology is abstracted in Thomson Reuters COVERAGE products (Current Contents: Physical, Chemical & Earth Sciences and Science Citation Index—Expanded, including the Web of Knowledge) and other databases. For a complete list of sources abstracting G&G, go to gia.edu/gandg. Gems & Gemology welcomes the submission of articles on all aspects of the field. Please see the Guidelines for Authors on MANUSCRIPT pp. 76–77 of this issue or contact the Managing Editor. Letters on articles published in Gems & Gemology are also welcome. SUBMISSIONS Abstracting is permitted with credit to the source. Libraries are permitted to photocopy beyond the limits of U.S. copyright law for private use of patrons. Instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. Copying of the photographs by any means other than traditional photocopying techniques (Xerox, etc.) is prohibited with- COPYRIGHT out the express permission of the photographer (where listed) or author of the article in which the photo appears (where no pho- AND REPRINT tographer is listed). For other copying, reprint, or republication permission, please contact the Managing Editor. Gems & Gemology is published quarterly by the Gemological Institute of America, a nonprofit educational organiza- PERMISSIONS tion for the gem and jewelry industry. Postmaster: Return undeliverable copies of Gems & Gemology to GIA, The Robert Mouawad Campus, 5345 Armada Drive, Carlsbad, CA 92008. Any opinions expressed in signed articles are understood to be the opinions of the authors and not of the publisher. ABOUT Pink diamonds have long been one of the most sought-after of gems. The lead article in this issue, by Dr. Wuyi THE COVER Wang and coauthors, describes a new production of strongly colored pink CVD lab-grown diamonds from Apollo Diamond Inc. The natural pink diamonds in these earrings weigh 1.09 and 1.03 ct; the radiant-cut yel- low diamonds total 2.21 ct. Courtesy Alan Friedman Co., Beverly Hills, California. Composite photo by Robert Weldon. Color separations for Gems & Gemology are by Pacific Plus, Carlsbad, California. Printing
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