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| inclusions or these cannot be seen because the host gem is too opaque. The brownish opal termed hyalite,...KennethScarratt, Kenneth Scarratt, F.G.A. F.G.A. The Gem Gem Testing Testing Laboratory Laboratory of of Great...Laboratory's name that has changed, firstly from 'The Gem Testing Laboratory of the London Chamber of of Commerce...Commerce and Industry' and then to 'The British Gem Testing Laboratory of the London Chamber ofCommerce...The The Laboratory Laboratory is now known as 'The Gem Testing Laboratory of of Great Britain'.. Britain' |
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| Edelseifen um Ratnapura . . . . . . . . . . 22 Lageskizze der Edelsteinfelder in der Provinz Sabaragamuwa Ceylons...Polonnaruwa • Kandy Nuwara Eliya Adam's Peak Ratnapura • .Pelmadulla • Rakwana Malara Karte von Ceylon...altorientalisches Dichterwort die paradiesische Insel Lanka an der Siidspitze Indiens. Es hat bis heute seine...von Edelsteinen wie gerade Ceylon.Bereits in den Lanka-Sagen finden sich manche Hinweise auf Ceylons Edelsteinreichtum...ausser Gewiirzen auch Perlen und edle Steine aus Lanka, wie Ceylon im Altertum hiess, exportiert wiirden |
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| assemblage such as the zeolites from India, or high gem quality such as the rubies from Burma, or some significantly...notable example in this category is the Nuristan District of Afghanistan, which over the past 10 years has...has produced some of the most extraordinary gem minerals ever found. The majority of this volume is based...Saijo, Iyo Province, Ehime Prefecture, Island of Shikoku Ashio Mine, Shimotsuke Province, Tochigi Prefecture...Arakawa Mines, Ugo Province, Akita Prefecture, Honshu The Obira Mine, Bungo Province, Oita Prefecture, |
 | | Journal (article/letter/editorial) |
| transparent yellow, well crystallized. and cut as a gem and that occurs in some of the world’s best-known...it is recovered as a detrital constituent of gem gravels and other placers. Its worldwide modes of occurrence...alexandrite crystal in matrix from the Takovaya district, Russia, in the Urals Geological Museum collection...relative abundance in pegmatites of the Custer district, Custer County, South Dakota (Roberts and Rapp...Mint~ral Society,and the Mineral Section of the Houston Gem and Mineral Society. I es of intergrown chrysoberyl |
 | | Journal (issue) |
| run verticall y or horizontally righ t across the gem surface. Onyx is very popu lar in pe n da n t s an...have been the name of a town in ancient Egypt. A GEM AND A ROCK I I Most alabaster is defined as the...be artificially ""tJ Right: Although the term 'gem' is most commonly associated with the precious mountings...alabaster from Volterra, near Pisa (Italy). This gem material is basically the mineral gypsum. Although...now exhausted, but the gem can still be found in small quantities in Sri Lanka, Burma and Brazil. Alexandrite's |
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| to prepare a new edition of the Guide. Many new gem species have been added to the collections in recent...wherever possible. In a developing world the names of gem-producing countries may change rapidly, but many...in brackets) arc shown in the following list: Sri Lanka (Ceylon), Malagasy Republic (Madagascar), Kampuchea...minerals which are used for orn amental purposes the gem minerals are arranged in a series of exhibits in...topaz, or zircon, which is in vogue; the favoured gem consequently rises in value until some new whim relegates |
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| Properties of crystals Gem crystals 18 19 19 20 20 21 22 32 33 3 3.1 3.2 3.3 Gem testing Hardness Gemstones...56 4 4.1 4.2 4.3 4.4 4.5 Recent developments in gem testing 59 59 60 61 64 65 Thermal conductivity...understandably and rightly, with the science of gem testing and have covered that area very well. Details...entirely new gem mineral species have been found in the last few years; tanzanite, appearing on the gem market...with no gem potential whatever. It is not likely that many entirely new mineral species with gem application |
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| structure Properties of crystals Gem crystals 19 19 20 20 21 22 32 33 3 Gem testing Hardness Gemstones and...Specific gravity 36 37 56 4 Recent developments in gem testing Thermal conductivity Measurement of refractive...understandably and rightly, with the science of gem testing and have covered that area very well. Details...entirely new gem mineral species have been found in the last few years; tanzanite, appearing on the gem market...with no gem potential whatever. It is not likely that many entirely new mineral species with gem application |
 | | Book (edition) |
| the authors 4 Iolite (cordierite) 55 Is it a gem? 5 Andalusite, Fibrolite (sillimanite) Finding...Further reading and credits 73 Tanzanite 54 Gem deposits of the world 74 Taaffeite 54 Index ...qualities of beauty, rarity and about the individual gem species. The main durability, which are determined...are described, together with identifying gems. Gem mineral formation is notes on items of particular...outreach and (GAGTL) and the British examiner for the gem testing services. Prior to this post die was European |
 | | Book (edition) |
| carats from Burma. gemstones. Tanzania. Rare Sri Lankan orange sapphire of 57.26 carats. Emerald...illustrated. The section ends with a brief account of gem cutting. The most popular gemstones are described...final section of the book is concerned with how gem minerals form, where they are found and how they...are identified, and a selected index to the main gem species, technical terms and important topics such...Geological Museum in London. The collection consists of gem minerals in both a natural state and cut as exquisite |
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| Corundums Sapphire: Lord Keeper of the Seals in the Gem Kingdom Beryl: Palette of Pastel Colors Emerald:...total beauty. The investigation and explanation of gem colors forms one of the most exciting chapters of...taken place, loose strata were formed, such as gravels, sands, and clays, deposited from water and air...often called placer deposits or alluvial gem gravels. Such gravels are found both in present-day stream beds...Obviously this can only signify that formations of the gem-rich phases of the sial cropped out particularly |
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| EDITION AREM, PH.D., FG.A. gem gemologists, 1977, jewelers, and gem collectors, dealers have relied...INTRODUCTION What / Gem? a / Scope of This Book / Is The Nature Gems of GEM SECTION 1 2 GEMSTONES...Rock Classification Gem Scarcity Intrusive Crystal 6 Growth Synthetic Gem 9 / Gemstones SOURCES...dealers are aware of the growing value of exotic gem species; the list of known taaffeites has thus grown...greater monetary reward than are the tists who gem scien- build detection equipment. Inevitably, a |
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| Manager Telephone: [800! 4 2 1-7250 x 2 0 1 Editor, Gem Trade Lab Notes C. W. Frver Editor, Gemological Abstracts...Misiorowslzi Contributing Editor, John I. Koivula Editors, Gem News John I. Koivula Robcrt C. Kammerling SUBSCRIPTIONS...Robert E. Kane 47 54 Gem Trade Lab Notes Gems & Gemology Challenge 60 Gem News Book Reviews 62 ...only did the first Sumitomo gem-quality synthetic diamonds appear on the gem marlzet, but De Beers released...information revealing just how far their experiments with gem-quality synthetic diamonds had progressed; one such |
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| kyewitness CRYSTAL & GEM Apatite Cut topazes Calcite kyewitness CRYSTAL & GEM In association with...of an Indian woman ‘bedecked with jewellery Le GEM OF A CRYSTAL © Most gemstones are natural crystals...two shadow edges, depending on | = | whether the gem is singly or doubly = | refractive, form ona scale...containing fine gemquality crystals are known as gem pockets. This gem pocket CHANGED BY FORCE As a result of...This technique is often used to sort out gem-rich river gravels in areas such as Myanmar (formerly Burma) |
 | | Journal (article/letter/editorial) |
| 0 4 and is closely related to another beautiful gem: spinel. It is less closely related to the beryl...stone is moved), it is called cymophane. It is not a cat's-eye. Cymophane does occur in cat's-eye type...[University of Florida] at 19:21 06 August 2017 a small gem may be obtained from a large piece of rough. Probably...than that of Brazil. It is recovered from the gem gravels there and occurs in sizes from sand up to at...19:21 06 August 2017 Colonel Barron of the Southern Gem and Mineral Company, (5241 Montaya Road, Upper Valley |
 | | Journal (article/letter/editorial) |
| of fissures, and therefore unfit for cutting as gem-stones. They may, however, con tain pure and transparent...have been found in comparative abundance in the gem gravels of Ceylon. These show the characteristic dichroism...some display, in addition, the chatoyancy of cymophane, a feature never seen in the specimens from the...mentioned was cut with double facets, and gave a gem measuring 33 by 32 millimeters. Its color by day...the same composition and properties as the natural gem. These so-called Alexandrites are more bluish in |
 | | Journal (issue) |
| Presentations | ‘Living Room Sessions’ Webinars Gem Notes Cover photo: The aquamarine photo on the cover...from Zambia and/or Mozambique), while the largest gem weighs 58.57 ct and is from Santa Maria, Brazil....Gemmologiques de Paris | Gem-A Conference | 37th International Gemmological Conference Gem-A Notices 820 Learning...of Interest 831 838 The Journal is published by Gem-A in collaboration with SSEF. Photo by Chunyan Wang...Brendan M. Laurs brendan.laurs@ gem-a.com Ahmadjan Abduriyim Tokyo Gem Science LLC, Tokyo, Japan Executive |
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| GEMS Introduction 10 Gem descriptions is ORGANIC GEMS Introduction Z2i2 Gem descriptions 274 SYNTHETIC...SYNTHETIC AND ARTIFICIAL PRODUCTS Introduction 316 Gem descriptions 329 Synoptic Tables 366 Glossary...Probably the first question one tends to ask sbout a gem, as of a mineral, is ‘‘What is it?’’ Some look quite...including the use of a chemical hood and gloves. If a gem under examination is put, for example, into bottle...observations will be sufficient to identify the gem. Where a more precise figure is required, two pairs |
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| same time people in the jewelry industry and the gem trade have recognized the need for greater technical...description of a great collection, a single gem material, gem cutting, or jewelry making. In addition many...chapter, dealing with the genesis and occurrence of gem minerals, is followed by chapters on the chemical...in their determination. Brief chapters deal with gem inclusions and imperfections, synthesis, imitation...subject and a gem index to facilitate obtaining con1monly sought information; the name in the gem index is |
 | | Book (edition) |
| Related titles The Diamond Formula A. Barnard Gem Testing, Tenth edition B.W. Anderson, Revised by...the last 170 years The essential qualities of a gem material Organic and inorganic gems 1 1 1 9 10 ...species and varieties The origin of gems Gem occurrences The major gem localities Mining techniques 11 11... Ruby Sapphire 221 222 18 Identifying organic gem materials and their simulants Natural pearls Cultured...volume, particularly in its emphasis on practical gem identification. I am also grateful to Vivian Watson |
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| VOL.2 Bauer, Max Precious stones J FOX LAKE DISTRICT LIBRARY 2§| £ J3RAND AVENUE 60020 - PRECIOUS...Sapphire . Other varieties Spinel. Chrysoberyl Cymophane Alexandrite Beryl . Emerald . Precious beryl (Aq...candlelight Chrysoberyl, crystal : Brazil „ „ 11. (Cymophane), cut PLATE XIII. „ la. ., 2. ,, „ dark... Diamond-fields of the Diamantina. . . . district, Brazil .... „ 36. Occurrence of diamond in...corundum is of a poor colour it will still be cut as a gem, since the fine lustre of the mineral will redeem |
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| E YE WI TNES S HA N D B O O KS GEM STONES The visual guide to more than 130 gemstone varieties...org/details/gemstoneseyewitnOOcall EYEWITNESS HANDBOOKS GEM STONES E YE WI TNESS HANDBOOKS GEMSTONES Cally...varieties are found and fashions change. Over 130 gem species, including some exceptionally rare stones...why the species entries in this its book show the gem rough, natural state, perhaps embedded in still...they can be appreciated by anyone, from the amateur gem-spotter to the enthusiast who enjoys their beauty |
 | | Journal (article/letter/editorial) |
| thevaluestated,but as it is the principalsource of that gem,futureproduction will presumably approximate the...lyfrom year to year andevenin themostimportant gem-producing Countries, like SouthAfrica, the variabledemandfor...Moonstone4 ........... Cairngorm ß ........... Cymophane• .......... Amazonstone, anatase, euclase,4 cordierite..................... Agate ................... Cymophane .............. Amethyst ................ Nephrite............... Topaz .................... Beach gravels-Agate .................. N e p h r i t e, labradorRe |
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| if not created, a rapid growth in the hobbies of gem cutting, jewelry making, and mineral collecting....same time people in the jewelry industry and the gem trade have recognized the need for greater technical...description of a great collection, a single gem material, gem cutting, or jewelry mak- ing. In addition...chapter, dealing with the genesis and occurrence of gem minerals, is followed by chapters on the chemical...in their determination. Brief chapters deal with gem inclusions and imperfections, synthesis, imitation |
 | | Journal (article/letter/editorial) |
| have been found in comparative abundance in the gem gravels of Ceylon. These show the characteristic dichroism...some display, in addition, the chatoyancy of cymophane, a feature never seen in the specimens from the...mentioned was cut with double facets, and gave a gem ROCKS AND MINERALS measuring 33 by 32 millimeters...the same composition and properties as the natural gem. These so-called Alexandrites are more bluish in...a part of the local gem trade. We advise those who are going to Europe, on a gem hunt, to rent a car |
