Paris Fashion Week and Its Gems
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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. -
Washington State Minerals Checklist
Division of Geology and Earth Resources MS 47007; Olympia, WA 98504-7007 Washington State 360-902-1450; 360-902-1785 fax E-mail: [email protected] Website: http://www.dnr.wa.gov/geology Minerals Checklist Note: Mineral names in parentheses are the preferred species names. Compiled by Raymond Lasmanis o Acanthite o Arsenopalladinite o Bustamite o Clinohumite o Enstatite o Harmotome o Actinolite o Arsenopyrite o Bytownite o Clinoptilolite o Epidesmine (Stilbite) o Hastingsite o Adularia o Arsenosulvanite (Plagioclase) o Clinozoisite o Epidote o Hausmannite (Orthoclase) o Arsenpolybasite o Cairngorm (Quartz) o Cobaltite o Epistilbite o Hedenbergite o Aegirine o Astrophyllite o Calamine o Cochromite o Epsomite o Hedleyite o Aenigmatite o Atacamite (Hemimorphite) o Coffinite o Erionite o Hematite o Aeschynite o Atokite o Calaverite o Columbite o Erythrite o Hemimorphite o Agardite-Y o Augite o Calciohilairite (Ferrocolumbite) o Euchroite o Hercynite o Agate (Quartz) o Aurostibite o Calcite, see also o Conichalcite o Euxenite o Hessite o Aguilarite o Austinite Manganocalcite o Connellite o Euxenite-Y o Heulandite o Aktashite o Onyx o Copiapite o o Autunite o Fairchildite Hexahydrite o Alabandite o Caledonite o Copper o o Awaruite o Famatinite Hibschite o Albite o Cancrinite o Copper-zinc o o Axinite group o Fayalite Hillebrandite o Algodonite o Carnelian (Quartz) o Coquandite o o Azurite o Feldspar group Hisingerite o Allanite o Cassiterite o Cordierite o o Barite o Ferberite Hongshiite o Allanite-Ce o Catapleiite o Corrensite o o Bastnäsite -
Geology Club Mineral: Collecting Trip
Geology Club: Mineral Collecting Trip (10 October 2009) Trip Notes by Charles Merguerian STOP 1 – Grossular Garnet Locality, West Redding, Connecticut. [UTM Coordinates: 630.71E / 4575.38N, Bethel quadrangle]. Covering roughly 60 acres of land, this enigmatic massive fine-grained grossularite garnet + diopside rock in West Redding has made many mineral collectors and geologists take notice. Walk up the steep slope east of Simpaug Turnpike to see highly fractured, massive cinnamon-colored grossular garnet rock, part of a 0.6-km wide heart-shaped mass found at the faulted contact between the Stockbridge Marble (OCs) and injected muscovitic schist of the Rowe Schist member (OCr) of the Hartland Formation (Figure 1). According to Rodgers et al. (1985), we are very near Cameron’s Line (red and black line in Figure 1). Figure 1 – Geologic map of the area surrounding Stop 1 showing the Proterozoic gneissic rocks (Yg) and Cambrian Dalton Schist (Cd) to the west, the Stockbridge Marble (OCs), Cameron’s Line (CL in red), the injected schistose rocks of the Rowe Formation (OCr), and an Ordovician granitoid (Og) that may be responsible for this unusual Ca++-enriched skarn deposit. Note the NW-trending high-angle brittle faults that cut the region. (Adapted from Rodgers et al. 1985.) Two knolls at this locality are almost entirely composed of grossularite garnet (var. essonite) and lesser clinopyroxene. Mostly the garnet occurs alone with minor quartz and localized quartz veining has been observed. Chemical analysis of the garnet (SiO2 = 39.10%, CaO = 34.85%, Al2O3 = 19.61%, and total FeO+Fe2O3 = 5.44%), are quite similar to published analyses of grossular garnet, including the phenomenal grossular garnet crystals from Morelos, Mexico. -
Download Lot Listing
IMPORTANT JEWELRY Wednesday, December 16, 2020 DOYLE.COM Lot 26 IMPORTANT JEWELRY AUCTION Wednesday, December 16, 2020 at 12pm Eastern VIEWINGS BY APPOINTMENT Please contact Laura Chambers to schedule your appointment: [email protected] Safety protocols will be in place with limited capacity. Please maintain social distance during your visit. LOCATION Doyle Auctioneers & Appraisers 175 East 87th Street New York, NY 10128 212-427-2730 DOYLE.COM Sale Info View Lots and Place Bids The journey of the Wilson family from the deep became intimate with “Old New York Society,” summering antebellum South to the pinnacle of New York with their new peers in Newport and traveling to Gilded Age society began with the marriage in 1852 London and Paris. Highlighting the December 16 of the enterprising Georgia-born Richard Thornton auction is an antique natural pearl and diamond tiara Wilson, the son of a tanner and shoemaker, to with provenance of Melissa Clementine Johnston Melissa Clementine Johnston, the daughter of a Wilson (lot 111). She is seen wearing the tiara in a prosperous Tennessee merchant and planter. With an portrait painted by French artist Léon Bonnat initial investment from his new father-in-law, Wilson’s (1833-1922). early business ventures flourished. During the Civil War, Wilson served in important roles in the office of The couple’s five children all made brilliant marriages, the Commissary-General of the Confederacy, traveling to aligning the Wilsons with the some of the most elite London to broker the Southern cotton crop. families of New York and Great Britain and earning Emerging from the war $500,000 richer, he began them the moniker, “The Marrying Wilsons.” buying up defunct railroads. -
Mineral Processing
Mineral Processing Foundations of theory and practice of minerallurgy 1st English edition JAN DRZYMALA, C. Eng., Ph.D., D.Sc. Member of the Polish Mineral Processing Society Wroclaw University of Technology 2007 Translation: J. Drzymala, A. Swatek Reviewer: A. Luszczkiewicz Published as supplied by the author ©Copyright by Jan Drzymala, Wroclaw 2007 Computer typesetting: Danuta Szyszka Cover design: Danuta Szyszka Cover photo: Sebastian Bożek Oficyna Wydawnicza Politechniki Wrocławskiej Wybrzeze Wyspianskiego 27 50-370 Wroclaw Any part of this publication can be used in any form by any means provided that the usage is acknowledged by the citation: Drzymala, J., Mineral Processing, Foundations of theory and practice of minerallurgy, Oficyna Wydawnicza PWr., 2007, www.ig.pwr.wroc.pl/minproc ISBN 978-83-7493-362-9 Contents Introduction ....................................................................................................................9 Part I Introduction to mineral processing .....................................................................13 1. From the Big Bang to mineral processing................................................................14 1.1. The formation of matter ...................................................................................14 1.2. Elementary particles.........................................................................................16 1.3. Molecules .........................................................................................................18 1.4. Solids................................................................................................................19 -
The Good Germans the Hemmerles, Munich’S First Family of Jewelry, Design Baubles That Are Truly One of a Kind
Clockwise from left: Chris- tian and Stefan Hemmerle at home; Hemmerle’s 18k white gold, black iron and aquamarine ring, 18k red gold, moonstone, amethyst and sapphire brooch, and 18k white gold, red patinated copper, spinel and amethyst earrings, prices available upon request, at Hemmerle, 011.800.2422.6000. ccessories ∂lash ccessories a W The Good Germans The Hemmerles, Munich’s first family of jewelry, design baubles that are truly one of a kind. Photographs by S t e f a n K o r t e t’s not every client request that 230 pieces of haute joaillerie each year in its inspires a designer to branch off into a 12-artisan Munich workshop, is renowned direction he never before imagined— for its austere architectural settings ren- I and subsequently to develop an entirely dered in unorthodox materials including new style in doing so. But that’s exactly how copper, stainless steel, brass, aluminum and the German jewelry house Hemmerle came rare woods, and for its use of exquisitely to enjoy its current status as one of today’s cut colored gemstones. The heaviness of most inventive and sought-after jewelers. a masculine charcoal-hued iron band, for It all began in 1995, when a prominent instance, only enhances the sharp angles of Munich art collector commissioned Ste- an emerald-cut 40-carat electric blue aqua- fan Hemmerle, a third-generation jeweler, marine ring, while the warm hues of orange to create a birthday present for his wife, a and red patinated copper perfectly com- woman who detested flashy gems. -
Spinel and Its Treatments: a Current Status Report
GEMOLOGY Spinel and its Treatments: A Current Status Report By Christopher P. Smith, American Gemological Laboratories Introduction and they are only rarely encountered Clarity Enhancement by the major labs around the world. Spinel has historically been one of However, the author has noticed a The practice of filling fissures to reduce the most highly revered gemstones. general increase in the attempts to their visibility and improve the apparent However, over an extended period improve spinel quality and color, clarity of a gemstone is probably of time, its popularity had suffered utilizing a variety of treatment the single most prevalent treatment as a result of many factors, including practices. applied to gemstones. Oils and other its classification as “semi-precious” and a general confusion with another dominant red gemstone: ruby. More recently though, spinel has been making a strong comeback and so its popularity is once again on the rise. Articles of important new sources and even a book devoted to this beautiful and colorfully diverse gemstone have helped to focus attention back onto spinel (see e.g. Smith et.al., 2007; Senoble, 2008; Pardieu et.al., 2009; Krzemnicki, 2010; Yavorskyy and Hughes, 2010). In addition to exhibiting a vibrant array of shades and nuances of color, spinel has also traditionally been spared the controversy of treatments that have encumbered many other gem varieties, such as ruby, sapphire, emerald, quartz, topaz and tanzanite among others. Fortunately, spinel remains a gemstone that is generally free of treatment considerations. However, today some treatments are starting to be encountered (Robertson, 2012). This article is a review of those treatments and the gemological characteristics that help to distinguish them. -
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. -
Mineral Collecting Sites in North Carolina by W
.'.' .., Mineral Collecting Sites in North Carolina By W. F. Wilson and B. J. McKenzie RUTILE GUMMITE IN GARNET RUBY CORUNDUM GOLD TORBERNITE GARNET IN MICA ANATASE RUTILE AJTUNITE AND TORBERNITE THULITE AND PYRITE MONAZITE EMERALD CUPRITE SMOKY QUARTZ ZIRCON TORBERNITE ~/ UBRAR'l USE ONLV ,~O NOT REMOVE. fROM LIBRARY N. C. GEOLOGICAL SUHVEY Information Circular 24 Mineral Collecting Sites in North Carolina By W. F. Wilson and B. J. McKenzie Raleigh 1978 Second Printing 1980. Additional copies of this publication may be obtained from: North CarOlina Department of Natural Resources and Community Development Geological Survey Section P. O. Box 27687 ~ Raleigh. N. C. 27611 1823 --~- GEOLOGICAL SURVEY SECTION The Geological Survey Section shall, by law"...make such exami nation, survey, and mapping of the geology, mineralogy, and topo graphy of the state, including their industrial and economic utilization as it may consider necessary." In carrying out its duties under this law, the section promotes the wise conservation and use of mineral resources by industry, commerce, agriculture, and other governmental agencies for the general welfare of the citizens of North Carolina. The Section conducts a number of basic and applied research projects in environmental resource planning, mineral resource explora tion, mineral statistics, and systematic geologic mapping. Services constitute a major portion ofthe Sections's activities and include identi fying rock and mineral samples submitted by the citizens of the state and providing consulting services and specially prepared reports to other agencies that require geological information. The Geological Survey Section publishes results of research in a series of Bulletins, Economic Papers, Information Circulars, Educa tional Series, Geologic Maps, and Special Publications. -
Gem-Quality Tourmaline from LCT Pegmatite in Adamello Massif, Central Southern Alps, Italy: an Investigation of Its Mineralogy, Crystallography and 3D Inclusions
minerals Article Gem-Quality Tourmaline from LCT Pegmatite in Adamello Massif, Central Southern Alps, Italy: An Investigation of Its Mineralogy, Crystallography and 3D Inclusions Valeria Diella 1,* , Federico Pezzotta 2, Rosangela Bocchio 3, Nicoletta Marinoni 1,3, Fernando Cámara 3 , Antonio Langone 4 , Ilaria Adamo 5 and Gabriele Lanzafame 6 1 National Research Council, Institute for Dynamics of Environmental Processes (IDPA), Section of Milan, 20133 Milan, Italy; [email protected] 2 Natural History Museum, 20121 Milan, Italy; [email protected] 3 Department of Earth Sciences “Ardito Desio”, University of Milan, 20133 Milan, Italy; [email protected] (R.B.); [email protected] (F.C.) 4 National Research Council, Institute of Geosciences and Earth Resources (IGG), Section of Pavia, 27100 Pavia, Italy; [email protected] 5 Italian Gemmological Institute (IGI), 20123 Milan, Italy; [email protected] 6 Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, 34149 Trieste, Italy; [email protected] * Correspondence: [email protected]; Tel.: +39-02-50315621 Received: 12 November 2018; Accepted: 7 December 2018; Published: 13 December 2018 Abstract: In the early 2000s, an exceptional discovery of gem-quality multi-coloured tourmalines, hosted in Litium-Cesium-Tantalum (LCT) pegmatites, was made in the Adamello Massif, Italy. Gem-quality tourmalines had never been found before in the Alps, and this new pegmatitic deposit is of particular interest and worthy of a detailed characterization. We studied a suite of faceted samples by classical gemmological methods, and fragments were studied with Synchrotron X-ray computed micro-tomography, which evidenced the occurrence of inclusions, cracks and voids. -
Gemmology Bulletin Summer 2020 the First Identification of Spinel
Summer 2020 Gemmology Bulletin Published: 17 May (revised 30 June) www.LustreGemmology.com/research By Lustre Gemmology ® All rights reserved The First Identification of Spinel By James Evans, FGA The credit for the first identif ication of ‘Spinel’ is commonly given to Jean-Baptiste Louis de Romé de L'Isle. Within his 1783 work Crystallography, De Romé de L'Isle identified ‘Spinel Ruby’ through its octahedral and macle forms. But is this credit warranted? After all, The octahedral and macle today’s gemmologists would be ill- forms of ‘Spinel Ruby’.1 advised to rely on crystal form alone. Historically, all red gemstones were considered varieties of ‘Ruby’. Nevertheless, the ‘True Ruby’ (also known as ‘Oriental Ruby’) was commonly separated from other varieties by its hardness.2 As such, Anselme Boece de Boot gave a practical account of the identification of ‘True Ruby’ in 1644: The RUBY is a transparent gem of a reddish colour, with a small portion of blue, and cannot be touched by a file. The redness is not like that of vermillion3 but of blood, or rather of cochineal4, or kermess5; but the less blue it has in it the better it is […]. In Pegu [Myanmar] they are found in a river of that name and the inhabitants try their goodness with their teeth and tongue, for they judge those that are coldest and hardest are the best. (De Boot, 1644. As summarised by Brookes, 1763, pp.133-134) De Boot thus described ‘True Ruby’ as: a transparent gem of purple-red colour; extremely hard; and a good conductor of heat… all useful information in examining a water-worn stone. -
Gemstones by Donald W
GEMSTONES By Donald W. olson Domestic survey data and tables were prepared by Nicholas A. Muniz, statistical assistant, and the world production table was prepared by Glenn J. Wallace, international data coordinator. In this report, the terms “gem” and “gemstone” mean any gemstones and on the cutting and polishing of large diamond mineral or organic material (such as amber, pearl, petrified wood, stones. Industry employment is estimated to range from 1,000 to and shell) used for personal adornment, display, or object of art ,500 workers (U.S. International Trade Commission, 1997, p. 1). because it possesses beauty, durability, and rarity. Of more than Most natural gemstone producers in the United states 4,000 mineral species, only about 100 possess all these attributes and are small businesses that are widely dispersed and operate are considered to be gemstones. Silicates other than quartz are the independently. the small producers probably have an average largest group of gemstones; oxides and quartz are the second largest of less than three employees, including those who only work (table 1). Gemstones are subdivided into diamond and colored part time. the number of gemstone mines operating from gemstones, which in this report designates all natural nondiamond year to year fluctuates because the uncertainty associated with gems. In addition, laboratory-created gemstones, cultured pearls, the discovery and marketing of gem-quality minerals makes and gemstone simulants are discussed but are treated separately it difficult to obtain financing for developing and sustaining from natural gemstones (table 2). Trade data in this report are economically viable deposits (U.S.