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Rhodochrosite Gems Unstable Colouration of Padparadscha-Like
Volume 36 / No. 4 / 2018 Effect of Blue Fluorescence on the Colour Appearance of Diamonds Rhodochrosite Gems The Hope Diamond Unstable Colouration of in London Padparadscha-like Sapphires Volume 36 / No. 4 / 2018 Cover photo: Rhodochrosite is prized as both mineral specimens and faceted stones, which are represented here by ‘The Snail’ (5.5 × 8.6 cm, COLUMNS from N’Chwaning, South Africa) and a 40.14 ct square-cut gemstone from the Sweet Home mine, Colorado, USA. For more on rhodochrosite, see What’s New 275 the article on pp. 332–345 of this issue. Specimens courtesy of Bill Larson J-Smart | SciAps Handheld (Pala International/The Collector, Fallbrook, California, USA); photo by LIBS Unit | SYNTHdetect XL | Ben DeCamp. Bursztynisko, The Amber Magazine | CIBJO 2018 Special Reports | De Beers Diamond ARTICLES Insight Report 2018 | Diamonds — Source to Use 2018 The Effect of Blue Fluorescence on the Colour 298 Proceedings | Gem Testing Appearance of Round-Brilliant-Cut Diamonds Laboratory (Jaipur, India) By Marleen Bouman, Ans Anthonis, John Chapman, Newsletter | IMA List of Gem Stefan Smans and Katrien De Corte Materials Updated | Journal of Jewellery Research | ‘The Curse Out of the Blue: The Hope Diamond in London 316 of the Hope Diamond’ Podcast | By Jack M. Ogden New Diamond Museum in Antwerp Rhodochrosite Gems: Properties and Provenance 332 278 By J. C. (Hanco) Zwaan, Regina Mertz-Kraus, Nathan D. Renfro, Shane F. McClure and Brendan M. Laurs Unstable Colouration of Padparadscha-like Sapphires 346 By Michael S. Krzemnicki, Alexander Klumb and Judith Braun 323 333 © DIVA, Antwerp Home of Diamonds Gem Notes 280 W. -
March 2019 Agate Explorer.Pub
Cuyuna Rock, Gem and Mineral Society The Agate Explorer March 2019 Summer Field Trip Plans are being made for a long weekend trip to Thunder Bay to collect amethyst. The tentative dates are Friday -Sunday, July 5 -7. A sign -up sheet will be available at upcoming meeting in order to plan this trip. It is necessary to have a passport to travel to Canada. You may also check to see if an enhanced driver’s license is acceptable. March meeting Open Shop from 9 a.m. —noon Franklin Art Center Club member, Ray Strassberg, will be available for members to learn how Club Information to cut rocks using the 10” or 16” inch saws. Website -www.cuyunarockclub.org - Email [email protected] Bring rocks of your own or purchase something in the Rock Room. Meeting Place Lower level Franklin Arts Center Kids’ Program 1001 Kingwood St, Brainerd, MN 56401 Did you know that there are many Directions .4 mile east of Business Hwy. 371 different kinds of Lake Superior & Hwy. 210 intersection. agates? Lisa will tell you all about it (Castle turret water tower.) at the March meeting! Date/Time the 2nd Saturday of each month Rock Wrappers at 2 p.m. unless otherwise noted. Meets starting at 10 a.m. on meeting Saturdays. Club Dues $20/ family ,An open gathering for wire wrappers. Hang out with other wrappers, Free /unaccompanied juniors and work on your projects. (Bring all supplies needed.) Membership runs Learn tricks to make wrapping easier, a new design, from Jan. 1-Dec. 31st. or perhaps a new place to find supplies. -
Symposium on Agate and Cryptocrystalline Quartz
Symposium on Agate and Cryptocrystalline Quartz September 10 – 13, 2005 Golden, Colorado Sponsored by Friends of Mineralogy, Colorado Chapter; Colorado School of Mines Geology Museum; and U.S. Geological Survey 2 Cover Photos {top left} Fortification agate, Hinsdale County, Colorado, collection of the Geology Museum, Colorado School of Mines. Coloration of alternating concentric bands is due to infiltration of Fe with groundwater into the porous chalcedony layers, leaving the impermeable chalcedony bands uncolored (white): ground water was introduced via the symmetric fractures, evidenced by darker brown hues along the orthogonal lines. Specimen about 4 inches across; photo Dan Kile. {lower left} Photomicrograph showing, in crossed-polarized light, a rhyolite thunder egg shell (lower left) a fibrous phase of silica, opal-CTLS (appearing as a layer of tan fibers bordering the rhyolite cavity wall), and spherulitic and radiating fibrous forms of chalcedony. Field of view approximately 4.8 mm high; photo Dan Kile. {center right} Photomicrograph of the same field of view, but with a 1 λ (first-order red) waveplate inserted to illustrate the length-fast nature of the chalcedony (yellow-orange) and the length-slow character of the opal CTLS (blue). Field of view about 4.8 mm high; photo Dan Kile. Copyright of articles and photographs is retained by authors and Friends of Mineralogy, Colorado Chapter; reproduction by electronic or other means without permission is prohibited 3 Symposium on Agate and Cryptocrystalline Quartz Program and Abstracts September 10 – 13, 2005 Editors Daniel Kile Thomas Michalski Peter Modreski Held at Green Center, Colorado School of Mines Golden, Colorado Sponsored by Friends of Mineralogy, Colorado Chapter Colorado School of Mines Geology Museum U.S. -
Exceptional Works of Art 2017 PUSHKIN ANTIQUES – MAYFAIR –
Exceptional works of art 2017 PUSHKIN ANTIQUES – MAYFAIR – At Pushkin Antiques we specialise in unique statement Each item is professionally selected and inspected pieces of antique silver as well as branded luxury items, to ensure we can give our customers a guarantee of stylish interior articles and objects d’art. authenticity and the required peace of mind when buying from us. Since the inception of our company, we’ve been at the forefront of online sales for high end, quality antiques. Our retail gallery is located on the lower floor of the world Our presence on most major platforms has allowed us famous Grays Antiques Centre in the heart of Mayfair. to consistently connect exquisite pieces with the most discerning collectors and interior decorators from all over the world with particular focus on the demands of the markets from the Far East, the Americas, Europe & Russia. www.pushkinantiques.com [email protected] We aim to provide the highest quality in every department: rare hand crafted articles, accurate item descriptions (+44) 02085 544 300 to include the history and provenance of each item, an (+44) 07595 595 079 extensive photography report, as well as a smooth buying process thus facilitating an efficient and pleasant online Shop 111, Lower Ground Floor, Grays Antiques Market. experience. 58 Davies St, London. W1K 5AB, UK. ALEX PUSHKIN OLGA PUSHKINA DUMITRU TIRA Founder & Director Managing Director Photographer Contents 6 ENGLISH SILVER 42 CHINESE SILVER 56 JAPANESE SILVER 66 INDIAN SILVER 78 BURMESE SILVER 86 CONTINENTAL SILVER 100 FRENCH SILVER 108 GERMAN SILVER 118 RUSSIAN SILVER 132 OBJECTS OF VERTU English Silver The style and technique in manufacturing silver during Hester Bateman (1708-1794) was one of the greatest this era (over 100 years) changed radically, reflecting silversmiths operating in this style, she is the most the variations in taste, society, costumes, economic and renowned and appreciated female silversmith of all time. -
AMETHYSTINE CHALCEDONY by James E
NOTES ANDa NEW TECHNIQUES AMETHYSTINE CHALCEDONY By James E. Shigley and John I. Koivula A new amethystine chalcedony has been discovered in that this is one of the few reported occurrences Arizona. The material, marketed under the trade name where an amethyst-like, or amethystine, chalced- "Damsonite," is excellent for both jewelry and carv- ony has been found in quantities of gemological ings. The authors describe thegemological properties of importance (see Frondel, 1962). Popular gem this new type of chalcedony, and report the effects of hunters' guides, such as MacFall (1975) and heat treatment on it. Although this purple material is Anthony et al. (19821, describe minor occurrences apparently b.new color type of chalcedony, it has the same gemological properties as the other better-known in Arizona of banded purple agate, but give no types. It corresponds to a microcrystalline form of ame- indication of deposits of massive purple chalced- thyst which, when heat treated at approximately ony similar to that described here. This article 500°C becomes yellowish orange, as does some briefly summarizes the occurrence, gemological single-crystal amethyst. properties, and reaction to heat treatment of this material. LOCALITY AND OCCURRENCE The purple chalcedony described here has been Chalcedony is a microcrystalline form of quartz found at a single undisclosed locality in central that occurs in a wide variety of patterns and colors. Arizona. It was first noted as detrital fragments in Numerous types of chalcedony, such as chryso- the bed of a dry wash that cuts through a series of prase, onyx, carnelian, agate, and others, have been sedimentary rocks. -
Fine Structure in Photoluminescence Spectrum of S2 Center in Sodalite
Phys Chem Minerals (2007) 34:477–484 DOI 10.1007/s00269-007-0161-y ORIGINAL PAPER – Fine structure in photoluminescence spectrum of S2 center in sodalite Aierken Sidike Æ Alifu Sawuti Æ Xiang-Ming Wang Æ Heng-Jiang Zhu Æ S. Kobayashi Æ I. Kusachi Æ N. Yamashita Received: 18 December 2006 / Accepted: 6 April 2007 / Published online: 12 June 2007 Ó Springer-Verlag 2007 Abstract The photoluminescence and excitation spectra stretching vibration of the isotopic species of 32S34S–,a 32 – of sodalites from Greenland, Canada and Xinjiang (China) main peak due to that of the isotopic species of S2 and are observed at 300 and 10 K in detail. The features of the five peaks due to phonon sidebands of the main peak. emission and excitation spectra of the orange-yellow flu- – orescence of these sodalites are independent of the locality. Keywords Sodalite Á Photoluminescence Á S2 center Á The emission spectra at 300 and 10 K consist of a broad Heat treatment Á Fine structure band with a series of peaks and a maximum peak at 648 and 645.9 nm, respectively. The excitation spectra ob- tained by monitoring the orange-yellow fluorescence at 300 Introduction and 10 K consist of a main band with a peak at 392 nm. The luminescence efficiency of the heat-treated sodalite Natural sodalite represented by the ideal formula Na8Al6 from Xinjiang is about seven times as high as that of un- Si6O24Cl2 or 3(Na2OÁAl2O3Á2SiO2)Á2NaCl is a well-known – treated natural sodalite. The emission spectrum of the S2 fluorescent mineral emitting orange-yellow fluorescence center in sodalite at 10 K consists of a band with a clearly under ultraviolet (UV) light. -
MAGAZINE • LEAWOOD, KS SPECIAL EDITION 2016 ISSUE 3 Fine Jewelers Magazine
A TUFTS COMMUNICATIONS fine jewelry PUBLICATION MAZZARESE MAGAZINE • LEAWOOD, KS SPECIAL EDITION 2016 ISSUE 3 fine jewelers magazine Chopard: Racing Special The New Ferrari 488 GTB The Natural Flair of John Hardy Black Beauties Omega’s New 007 SPECIAL EDITION 2016 • ISSUE 3 MAZZARESE FINE JEWELERS MAGAZINE • SPECIAL EDITION 2016 welcome It is our belief that we have an indelible link with the past and a responsibility to the future. In representing the fourth generation of master jewelers and craftsmen, and even as the keepers of a second generation family business, we believe that the responsibility to continually evolve and develop lies with us. We endeavor to always stay ahead of the latest jewelry and watch trends and innovations. We stay true to our high standards and objectives set forth by those that came before us by delivering a jewelry experience like no other; through the utmost attention to service, knowledge and value. Every great story begins with a spark of inspiration. We are reminded day after day of our spark of inspiration: you, our esteemed customer. Your stories help drive our passion to pursue the finest quality pieces. It is a privilege that we are trusted to provide the perfect gift; one that stands the test of time and is passed along through generations. We find great joy in assisting the eager couple searching for the perfect engagement ring, as they embark on a lifetime of love, helping to select a quality timepiece, or sourcing a rare jewel to mark and celebrate a milestone. We are dedicated to creating an experience that nurtures relationships and allows those who visit our store to enter as customers, but leave as members of our family. -
Of the Grand Cameo: a Holistic Approach to Understanding the Piece, Its Origins and Its Context Constantine Prince Sidamon-Eristoff Sotheby's Institute of Art
Sotheby's Institute of Art Digital Commons @ SIA MA Theses Student Scholarship and Creative Work 2018 The "Whys" of the Grand Cameo: A Holistic Approach to Understanding the Piece, its Origins and its Context Constantine Prince Sidamon-Eristoff Sotheby's Institute of Art Follow this and additional works at: https://digitalcommons.sia.edu/stu_theses Part of the Ancient, Medieval, Renaissance and Baroque Art and Architecture Commons, Fine Arts Commons, and the Metal and Jewelry Arts Commons Recommended Citation Sidamon-Eristoff, Constantine Prince, "The "Whys" of the Grand Cameo: A Holistic Approach to Understanding the Piece, its Origins and its Context" (2018). MA Theses. 14. https://digitalcommons.sia.edu/stu_theses/14 This Thesis is brought to you for free and open access by the Student Scholarship and Creative Work at Digital Commons @ SIA. It has been accepted for inclusion in MA Theses by an authorized administrator of Digital Commons @ SIA. For more information, please contact [email protected]. The “Whys” of the Grand Cameo: A Holistic Approach to Understanding the Piece, its Origins and its Context by Constantine P. Sidamon-Eristoff A thesis submitted in conformity With the requirements for the Master’s Degree Fine and Decorative Art and Design Sotheby’s Institute of Art 2018 Word Count: 14,998 The “Whys” of the Grand Cameo: A Holistic Approach to Understanding the Piece, its Origins and its Context By: Constantine P. Sidamon-Eristoff The Grand Cameo for France is the largest cameo surviving from antiquity. Scholars have debated who is portrayed on the stone and what its scene means for centuries, often, although not always, limiting their interpretations to this narrow area and typically only discussing other causes in passing. -
Of Coastal Ecuador
WASHINGTON UNIVERSITY Department of Anthropology Dissertation Examination Committee: David L. Browman, Chair Gwen Bennett Gayle Fritz Fiona Marshall T.R. Kidder Karen Stothert TECHNOLOGY, SOCIETY AND CHANGE: SHELL ARTIFACT PRODUCTION AMONG THE MANTEÑO (A.D. 800-1532) OF COASTAL ECUADOR by Benjamin Philip Carter A dissertation presented to the Graduate School of Arts and Sciences of Washington University in partial fulfillment of the requirements for the degree of Doctor of Philosophy May 2008 Saint Louis, Missouri Copyright by Benjamin Philip Carter © 2008 ii Acknowledgments For this research, I acknowledge the generous support of the National Science Foundation for a Dissertation Improvement Grant (#0417579) and Washington University for a travel grant in 2000. This dissertation would not exist without the support of many, many people. Of course, no matter how much they helped me, any errors that remain are mine alone. At Drew University, Maria Masucci first interested me in shell bead production and encouraged me to travel first to Honduras and then to Ecuador. Without her encouragement and support, I would not have begun this journey. In Honduras, Pat Urban and Ed Schortman introduced me to the reality of archaeological projects. Their hard- work and scholarship under difficult conditions provided a model that I hope I have followed and will continue to follow. While in Honduras, I was lucky to have the able assistance of Don Luis Nolasco, Nectaline Rivera, Pilo Borjas, and Armando Nolasco. I never understood why the Department of Anthropology at Washington University in St. Louis accepted me into their program, but I hope that this document is evidence that they made the right choice. -
TUCSON 2018 Spinel—In Pink and Lavender Hues—In Suites and Sets As Customers Found the Scarcity and High Prices of Red Spinel Prohibitive
Contributing Editors Emmanuel Fritsch, University of Nantes, CNRS, Team 6502, Institut des Matériaux Jean Rouxel (IMN), Nantes, France (fritsch@cnrs- imn.fr) Gagan Choudhary, Gem Testing Laboratory, Jaipur, India ([email protected]) Christopher M. Breeding, GIA, Carlsbad ([email protected]) manite. Many dealers posted strong sales of pastel-colored spinel—in pink and lavender hues—in suites and sets as TUCSON 2018 customers found the scarcity and high prices of red spinel prohibitive. In a similar vein, Margit Thorndal of Madagas- Every February the gem and mineral world descends on car Imports reported strong demand for purple-lavender Tucson, transforming the downtown convention center spinel and purple sapphire from Madagascar, as well as teal and a great many of the city’s hotels into a fascinating col- hues of unheated Montana sapphire. lage of traders bearing goods from all over the planet (fig- We noted that electric blues, teals, hot pinks, hot yel- ures 1 and 2). low greens, and pastel-colored gems were quite popular. Many of the exhibitors we spoke with described 2018 Bill Larson of Pala International pointed to this trend and as the strongest year since 2008. Although traffic wasn’t showed us a number of spectacular examples from his in- especially heavy at the AGTA and GJX shows, most deal- ventory. Fine blue zircon from Cambodia was prominent, ers there enjoyed brisk sales and healthy demand for high- as was attractive sphene from Zimbabwe and Madagascar. quality goods. Some of the same trends from last year were Dave Bindra of B&B Fine Gems said his company was evident. -
December 2019 Agate Explorer.Pub
Cuyuna Rock, Gem and Mineral Society The Agate Explorer December 2019 Potluck Christmas Party Saturday, December 14 Meal at noon. Followed by white elephant gift exchange. If you would like to participate in the exchange, bring one or more gift (gag or not, rock related or not). From 99----1111 that morning we will be finishing Franklin Art Center preparing boxes for the auction. Club Information Website -www.cuyunarockclub.org Email [email protected] No Rock Wrappers in December. Meeting Place Lower level Franklin Arts Center 1001 Kingwood St, Brainerd, MN 56401 Don’t forget! Your dues are due. Directions $20 per household per year, January -December. .4 mile east of Business Hwy. 371 & Hwy. 210 intersection. Checks made payable to: (Castle turret water tower.) Cuyuna Rock, Gem, and Mineral Society. Date/Time You may pay them at the Clubhouse, or mail to: the 2nd Saturday of each month Cuyuna Rock, Gem, and Mineral Society, at 2 p.m. unless otherwise noted. 1001 Kingwood St., Ste. B -40 Club Dues $20/ family Brainerd, MN 56401 Free /unaccompanied juniors Membership runs from Jan. 1-Dec. 31st. Club Calendar Club Purpose: December 14 - Christmas Potluck Party; 9-11, auction To foster an interest (& encourage preparation meal at noon, festivities to follow. young & old) to study earth January 4, 2020 —live auction of the Club members’ Moe and Wagoner collections at the Sample show in Brainerd, 10:30 a.m. science, enjoy the art of lapidary, January 11 —Meeting hunting for rocks, and semi - February 8 —Meeting precious stones. We also strive to March 14 —meeting use what we know and acquire to April -Meeting date subject to change. -
Spring 1995 Gems & Gemology
TABLE CONTENTS FEATURE ARTICLES 2 Rubies from Mong Hsu Adolf Pelsetti, I(ar7 Schmetzer, Heinz-Jiirgen Bernhardt, and Fred Mouawad " 28 The Yogo Sapphire Deposit Keith A. ~~chaluk NOTES AND NEW TECHNIQUES 42 Meerschaum from Eskisehir Province, Turkey I<adir Sariiz and Islcender Isilc REGULAR FEATURES 52 Gem Trade Lab Notes Gem News Most Valuable Article Award Gems ed Gemology Challenge Book Reviews Gemological Abstracts Guidelines for Authors ABOUT THE COVER: One of the most important ruby localities of the 1990s cov- ers a broad orea near the town of Mong Hsu, in northeastern Myann~ar(B~lrrna). The distinctive gemological features of these rubies are detailed in this issue's lead article. The suite of fine jewelry illustraled here contains 36 Mong Hsu rubies with a total weigh1 of 65.90 ct; the two rubies in the ring total 5.23 ct. jewelry courtesy of Mouawad jewellers. Photo by Opass Sultsumboon-Opass Suksuniboon Studio, Bangltolz, Thailand. Typesetting for Gerrls eS Gemology is by Graphix Express, Santa Monica, CA. Color separations are by Effective Graphics, Compton, CA. Printing is by Cadmus lournal Services, Easton, MD. 0 1995 Gemological Institute of America All rights reserved ISSN 0016-626X - Editor-in-Chief Editor Editors, Gem Trade Lab Notes Richard T. Lidtlicoat Alicc S. I<cller Robcrt C. I<ammerling 1660 Stewart St. C. W. Fryer Associate Editors Smta Mon~ca,CA 90404 William E. Boyajian Editors, Gem News (800)421-7250 ~251 Robcrt C. Kamn~erling Rohcrt C. I<ammerling e-mail: altellcrBclass.org D. Vincent Manson John I. Koivula John Sinltanltas Sr~bscriptions Enirnanuel Fritsch Jln Ll~n Editors, Book llevielvs Technical Editor (800) 421-7250 x201 Susan B.