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| The Natural History Museum of Milan and its Madagascar Collection The Museo Civico di Storia Naturale... the museum began paleontologic fieldwork in Madagascar (upper Permian fauna and Jurassic and Cretaceous...fieldwork in Madagascar in 1996 in collaboration with other institu tions in Madagascar, Italy, and the...Pezzotta has spent a total of twenty nine months in Madagascar making geological-mineralogical surveys. In collaboration...of both classic and new minerals and gemstones from Madagascar opened at the Natural History Museum in |
 | Giuliani, Gaston, Fallick, Anthony, Rakotondrazafy, Michel, Ohnenstetter, Daniel, Andriamamonjy, Alfred, Ralantoarison, Théogène, Rakotosamizanany, Saholy, Razanatseheno, Marie, Offant, Yohann, Garnier, Virginie, Dunaigre, Christian, Schwarz, Dietmar, Mercier, Alain, Ratrimo, Voahangy, Ralison, Bruno (2007) Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium Deposita, 42 (3) 251-270 doi:10.1007/s00126-006-0105-3 | Journal (article/letter/editorial) |
| Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin...composition of gem corundum was measured from 22 deposits and occurrenEditorial handling: B. Lehmann G....d’Antananarivo, Ambohitsaina, BP 906, Antananarivo 101, Madagascar Y. Offant Cerege, Europole Méditerranéen de l’Arbois...Ambaranjana Antanimora, Antananarivo 101, Madagascar ces in Madagascar to provide a gemstone geological identification...and characterization. Primary corundum deposits in Madagascar are hosted in magmatic (syenite and alkali |
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| Isabella Pignatelli and Vincent Pardieu Ruby Deposits: A Review and Geological Classification Reprinted...Determination of the Geographic Origin of Ruby and Sapphire Using an Expanded Trace Element Suite Plus Sr–Pb...Coexisting Rubies and Blue Sapphires from Major World Deposits: A Brief Review of Their Mineralogical Properties...focused on Australian and SE Asian minerals and gemstones, volcanic mineral associations, high pressure...written several well-received books that include Gemstones of the Southern Continents, The Volcanic Earth |
 | Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 | Journal (article/letter/editorial) |
| minerals Review Ruby Deposits: A Review and Geological Classification Gaston Giuliani 1, *, Lee A. Groat...gem varieties of ruby and sapphire are relatively rare. Gem corundum deposits are classified as primary...primary and secondary deposits. Primary deposits contain corundum either in the rocks where it crystallized...Earth’s surface. Classification systems for corundum deposits are based on different mineralogical and geological... An up-to-date classification scheme for ruby deposits is described in the present paper. Ruby forms |
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| Liddicoatite Tourmaline from Anjanabonoina, Madagascar Dona M. Dirlam, Brendan M. Laurs, Federico Pezzotta...Coated natural pearls • Spinel in heat-treated sapphire 86 Gem News International • Special report:...elbaite with Cu • Vesuvianite from Kenya and Madagascar • Star opal triplets • Plus: Emeralds from Hiddenite...Hiddenite, North Carolina • Star emerald from Madagascar • Tourmaline “slider” in quartz 107 109 111...his staff created lessons, gave instruction on gemstones and their properties, and began the process of |
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| publishers. Cover Picture Faceted sapphire from Cyangugu district, SW Rwanda. See Investigations on sapphires...Sapphires have been discovered in the Cyangugu district in south-west Rwanda (bordering Zaire) and details...1996, 25, 2, 87-89 Common and rare colourless gemstones David Kent FGA London Over the years I have compiled...compiled a collection of colourless gemstones which have been a source of fascination especially for...and a higher reading for the diamond/synthetic sapphire doublet. The higher meter reading for paste results |
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| Spring 2016 ISSUE 31 TRAPICHE The Rising Star Gemstones’ 2016 Price Level Trends Van Cleef & Arpels at...Singapore Museum Montana Sapphire Deposits Under The Spotlight Exceptional Gemstones AGTA GemFair Tucson...Spring 2016 ISSUE 31 TRAPICHE The Rising Star Gemstones’ 2016 Price Level Trends Van Cleef & Arpels at...at Singapore Museum Montana Sapphire Deposits Under The Spotlight Cover images:Tourmaline: courtesy of...of Ian Kalway. Sapphire and ruby: courtesy of Jeffrey Scovil, ©Primagem. CONTENTS Foreword Industry |
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| the World 22 Cover Stories Bemainty Sapphire Deposit in Madagascar Faces Multiple Challenges 46 54 62...2017 ISSUE 35 Identification of Sapphires from Madagascar with Inclusion Features Resembling Those of Sapphires...New Deposit at Bemainty near Ambatondrazaka in Madagascar InColor Editorial Committee Chairman Clement...of topics. It focused on the gamut of colored gemstones, literally from mine-to-market, with detailed...Guests will relish the latest jewelry, handcrafted gemstones, handicrafts and architecture that have been part |
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| Hans-Rudolf Wenk, and George R. Rossman The Indaia Sapphire Deposits of Minas Gerais, Brazil David S. Epstein,...coauthor-with Dr. Eduard J. Giibelin-f o f Inclusions i n Gemstones. Mr. Koivula also holds bachelor's degrees in...courtesy of Minerales y Metales del 0 ' ""' '" Va ichael II, ntr, HISTORY OF THE MINE The mining of ametrine...regional fault system, along which other quartz deposits have been identified. In the immediate area of...resistant to weathering and erosion. Several quartz deposits occur along this regional fault system (Litherland |
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| ARTICLES 464 Geology of Corundum and Emerald Gem Deposits: A Review Gaston Giuliani and Lee A. Groat Over...two decades, knowledge of the formation of gem deposits has improved significantly. This article reviews...geology and genesis of gem corundum and emerald deposits. p. 569 512 A Review of Analytical Methods...Methods Used in Geographic Origin Determination of Gemstones Lee A. Groat, Gaston Giuliani, Jennifer Stone-Sundberg... 536 Geographic Origin Determination of Blue Sapphire Aaron C. Palke, Sudarat Saeseaw, Nathan D. Renfro |
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| BaselWorld: A Gem Of A Show Couture Color Colored Gemstones Light Up Las Vegas Shows Colored Gem Prices Stay...stones. The issue now is to generate all of the gemstones’ added value, not just so that polished stones...all indications show that demand for colored gemstones, and especially emeralds, will One of the lots...reliable and trusted source of ethically produced gemstones. Transparency and accountability are crucial to...secure, reliable and convenient supply of our gemstones is a critical ingredient. We will naturally continue |
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| C. I( E L L E R Foreword by John Sinkankas Gemstones of East Africa PETER C. KELLER, Ph.D. Here...encompasses ·what may be the world's richest gem deposits, and is explored in depth in this pioneering work...travelers, and anyone with an interest in the world's gemstones. Nearly all known species of important gems are...made. In fact, with more than 40 varieties of gemstones from at least 60 known occurrences, East Africa... ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ .. ♦ , Gemstones of East Africa PETER C. KELLER, Ph.D. Executive |
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| (7) 2.14 ct blue sapphire, (8) 23.18 ct blue spinel, (9) 4.82 ct purple sapphire, (10) 5.32 ct Paraíba...1.15 ct purplepink sapphire, (16) 5.54 ct spessartine, (17) 8.04 ct orange sapphire, and (18) 3.48 ct...process of incorporating beautiful cut and polished gemstones into fine rings, necklaces, bracelets, and the...localities to treatments and synthetics to finished gemstones and jewelry. Our goal was to produce a valuable...Kenya, Zimbabwe, Nigeria, and Namibia, as well as Madagascar), South America (Brazil and Colombia), central |
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| Volume 36 / No. 8 / 2019 Sapphire Intaglio from Pompeii Chinese Synthetic Diamonds Trapiche Rubies...Assemblage in Emerald | Six-Rayed Star Enstatite from Madagascar | Yellowish Green Enstatite (and Star Enstatite)...Powellite and Molybdenite Inclusions | Quartz from Madagascar with Fuchsite Phantom Inclusions | Tourmaline...Ming Cultured Pearls | Dyed Banded Agate from Madagascar Cover photo: An 11.62 ct intaglio excavated...from Pompeii, Italy, proved to be a basaltic-type sapphire (see article on pp. 710–725 of this issue) and |
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| ......................................... 34 Madagascar ...............................................Association, Israel; Gemstar, Israel; Tom Cushman, USA/ Madagascar; Pala International, USA; Sokolov Co., Russia;...period, as never before has such a variety of gemstones from different sources been available in the trade...the public interest for gemstones is growing in most countries, many new gemstones are finding their place...Nairobi, Kenya; Udi Harel, Israel; Tom Cushman, Madagascar; Linus Adie, Nigeria; Bill Larson, USA; Veronica |
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| [4] and for exploration quests to find new ruby deposits [5,6]. This Special Issue brings together seven...mineral associates from a wide range of global deposits across various genetic settings. The papers cover...ruby and its range of genetic expressions in its deposits by Giuliani et al. [7]. This not only provides...presents an encompassing survey of its global deposits through historic and geological time. From this...throughout the text, field distribution maps of ruby deposits, field settings of ruby in Minerals 2020, 10 |
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| Challenge Zoisite – More than just Tanzanite Sapphire Rush in Kataragama Contemporary Jewelry: The Union...its Treatments: A Current Status Report Mining Sapphire Rush in Kataragama Jewelry Design Contemporary...Munich – A New Star at the Trade Fair Firmament Gemstones Dazzle at Tucson Fairs BaselWorld 2012: A Colored...since 1941 SPECIALIZING IN FINE, EXOTIC COLORED GEMSTONES & FANCY COLOR DIAMONDS Sparkles and Colors Inc...sector remains extremely strong. Exceptional gemstones and exclusive pieces of jewelry are in high demand |
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| resembles greenish-blue aquamarine from Tongafeno (Madagascar) but also contains three-phase inclusions like...two papers reflect the growing importance of Madagascar and describe features of sapphires from a new...efforts to establish its correct spelling! The first sapphire paper describes their geological setting and summarizes...greenish rock containing variable amounts of ruby and sapphire. However, this was not the source for goodletite...the mono-clinic system, may be fashioned into gemstones for collectors. The gemmological properties of |
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| wealth 16 Discovering rubies in Greenland 25 Gemstones color Russia's jewelry industry 28 The emerging...Discovering beryllium in Madagascar blue sapphire 41 GIA launches enhanced colored gemstones reports 42 Canadian...Canadian meeting discusses changing market 43 Gemstones strongly color Portojóia show 45 Bangkok Gems...only these auctions but trade in all Burmese gemstones, and of rubies in particular. However, it is ICA’s...2007. In contrast, auction sales for all other gemstones, except pearls, have dramatically decreased from |
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| pg. 269 284 Pezzottaite from Ambatovita, Madagascar: A New Gem Mineral Brendan M. Laurs, William...Gem-quality corundum from Colombia • Emeralds from Madagascar with strong blue/green dichroism • Peruvian blue...some possible uses of this technique to coat gemstones with polycrystalline CVD synthetic diamond. So...WINTER 2003 283 PEZZOTTAITE FROM AMBATOVITA, MADAGASCAR: A NEW GEM MINERAL Brendan M. Laurs, William...granitic pegmatite near Ambatovita in central Madagascar. Only a few dozen kilograms of gem rough were |
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| July 2004 ISSN: 1355^1565 129 Gem corundum deposits in Vietnam Pham Van Long1, Hoang Quang Vinh2...shows the importance of marble and basalt-type deposits. Other types of corundum occurrences are found...years, Vietnam has become a significant ruby and sapphire-producing country in south-east Asia {Figure 1)...placer deposits. At the same time, thousands of local peasants searched for ruby and sapphire and in...Scientific investigations of the genesis of these deposits led to several publications (Kane et al., 1991; |
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| the stones to be tested some blue beryls from Madagascar. These did not look like aquamarines b u t were...indicated. Examination of 23 faceted "sapphire"-blue beryl gemstones by gamma-ray spectroscopy indicates...to 0·75 micron (5000 to 7500A) region. 301 SAPPHIRE MINING IN CHANTABURI (THAILAND) By J. A. L. PAVITT...formerly named, is a well known source of sapphire, ruby, star-sapphire and zircon, and over the years the skill...first visit to Khau Ploi Waen, or "Hill of the Sapphire Ring", as this mining area at Chantaburi is named |
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| about the beauty, rarity, and value of colored gemstones. The jewelry sector is becoming more sophisticated...Color your life eit her way... Dealer of Fine Gemstones, Tanzanite & Zambian Emeralds Manufacturer of...exporters to set up a firm to engage in sourcing gemstones globally and distributing them in India, according...colored gemstones in Africa rose more than 50 percent in a month. “Usage of colored gemstones is part...have brought exporters and importers of colored gemstones together as stakeholders in the new company. This |
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| SAPPHIRES A CLASSIC GEMSTONE A sapphire is one of the most elegant of gemstones. Traditionally, blue (especially...million carats orlltonnesofcorundum) • What is a sapphire? Sapphires are a gemstone variety of the mineral...is derived from the Latin word rubeus, 'red'. Sapphire is from the Latin word sapphiris, 'blue', in turn...yellow sapphire, 'oriental emerald' for green sapphire and 'oriental amethyst' for purple sapphire should...should be avoided. Topaz, emerald and amethyst are gemstones of different minerals in their own right, and |
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| GEMSTONES ofthe World % . NHSeeeY REVISED.&@ EXPANDED THIRD EDL ERNS 4 y 4 MAW Alicommere ehesectepe...Cutting . i Fy 3 Ve, < $24.95 Can. $32.95 GEMSTONES of the World The standard reference for over...would you choose a diamond by its cut alone? Gemstones have fascinated people for thousands of years...plague. A link with astrology was formed, and gemstones were allocated to the signs of the zodiac. At...source is filled with fascinating facts about gemstones, both precious and semi-precious. It’s also a |
