 | | Book (edition) | | gemologists,gem collectors, sourcebook for immediate revised, Color En-gem dealers have...Properties Origin of Gemstones / 6 Rock ClassificationGem Scarcity Rock Types / / 9 Igneous Rocks / Intrusive.../ 16 Optics / 16 Spectral 37 / / SyntheticGem OF DATA USED / 13 14 FROM Definitions 9 / GEMSTONES.../ 9 Sedimentary Features / SOURCES Formula /GEM SECTION / / 19 19 20 / 237 238 COLOR MEASUREMENT...dealers are aware of the growing value of exoticgem species; the list of known taaffeites has thus grown | | | Book (edition) | | JOEL E. AREM, PH.D., FG.A.Sincethisgem collectors,gem dealers have relied ongemologists,1977...INTRODUCTION1What Is aGem? /Scope of This BookThe Nature of Gems2GEM SECTION//3/4GEMSTONES...PropertiesOrigin of GemstonesRock ClassificationGem Scarcity4Definitions6Characteristics9...Metamorphic Rocks / 10Color218/SyntheticGem Listing9///212/217/9Intrusive...So-called fancy colored diamonds (in truth, coloredgem-in the gemstone marketplace during this interval |  | | Journal (issue) | | SapphiresfromSriLankaKcirl Scl~metzerand Olaf MedenbachREGULARFEATURES112120124131Gem Trade Lab...Lab NotesGem NewsGemological AbstractsBook ReviewsABOUT THE COVER: The extraordinary play-of-color...Diffraction, one of the less common causes of color ingem materials, is described in this issuein the third...extensive listing of the known origins o f color ingem materials. The opal, from the Ditto3 Harold &>Collection...pit. Virtually all o f the diamondsrecovered aregem quality, although mostare relatively small, averaging |  | | Book | | sites Finding gems takes luck. Many historicgemABOVE Digging for diamondssources were discovered...manufactured material merelyresembles a naturalgem, but is different in composition, it is termed an...making imitations is to glue two or three pieces ofgem material togetherto make “doublets” or “triplets...and a big new find can turn a rareand expensivegem into one that is broadly available and affordable...the most incisive tools tobe brought to bear on agem are a good eye anda wealth of experience. What |  | | Book (edition) | | 12The Geological Sources of GemsCrystallineGem Materials340Part II345678910111213...The BiologicalGem MaterialsThe Fashioning of GemstonesValue-Enhanced Gemstones andGem Materials292...library for virtually all sources.Derivations ofgem and mineral names are not given; they can befound...not now considered valid or current.While manygem collectors collect mineral specimens too, the text...text for the 1994 edition. In this new edition, thegem testing section has been omitted; this information |  | | Book | | BermanecFormation Conditions and 40Ar/39Ar Age of theGem-Bearing Boqueirão Granitic Pegmatite,Parelhas,...Antonio Langone, Ilaria Adamo and Gabriele LanzafameGem-Quality Tourmaline from LCT Pegmatite in Adamello...Fallick, Maria Tsortanidis and Andreas LampridisGem Corundum Deposits of Greece: Geology, Mineralogy...Alluvial Sapphires from the Orosmayo Region, JujuyProvince, NorthwestArgentina: Insights into Their Origin...Cenozoic Alkaline Basalts of the Ratanakiri VolcanicProvince(Cambodia), Southeast Asia—Trace Element Geochemistry |  | | Book | | BUTTERWORTH-HEINEMANNGEM BOOKS ◊DB♦HOOVER♦ Butterworth-HeinemannGem BooksEdited by Peter...NassauGem Testing, 10th ednB. W. Anderson, revised by E. A. Jobbins Butterworth-HeinemannGem Books...DataHoover, D. B.Topaz. - (Butterworth-HeinemannGemBooks Series)I. Title II. Series553.8ISBN 0 7506...of South Africa 189Saudi Arabia 190Spain 190SriLanka 190Sweden 191Thailand 192Turkey 192United...Read asked if I would write one of Butterworth'sGem Books, I chosetopaz as the subject, because of my |  | | Book | | Chapter 2 Chapter 3 Chapter 4 - Basics The Geology ofGem Occurrences Crystallography Physical and Optical...Art of theGem 20B Chapter 8 - Diamanteering Chapter 9 - Lapidary Craft Chapter 10 -Gem Enhancement...Enhancement Chapter 11 -Gem Collecting Chapter 12 - Gemmology Chapter 13 -Gem Grading and Certification 210...each entry is organised as follows:Gem name[s] Specificgem names have varied ,vith time. The most...currently accepted version of the chemistry of agem mineral. In cases where this is not given it is because |  | | Book | | loosely associated one with the other. Occurrence:district). Japan—Tajima (Akenobe AKERITE AIKINITE or...3-6. Occurrence: USSR—Ural Mountains. Burma.SriLanka. Occurrence: USA— Lake Superior region. USSR—Chili...of nepheline and garnet. Occurrence: Portugal—Province of A1 garve. ALKALI ALLAGITE Derivative of rhodonite...coarse detrital materials, such as silt, sands andgravels, laid down by a stream, interbedded with finer-textured...garnet and precious garnet. Bluish or violet-redgem variety of spinel. Occurrence: USA—Colorado (Red |  | | Book (edition) | | complete cross index of familiargemnames. Information on eachgemincludes chemical formula, crystal...represent today's most sophisticated techniquesforgemhisownphotography.Resulting fromthree-year...clearly revealing thedegree of birefringence in agem, aswell as any inclusionsSome of the data provided...published before, such as thedispersion values for 15gem materials.Thesevaluesarecalculatedfrom...useful for gemologists.toOf practical interest togem cutters isaspecial graph relating critical angle | | | Book | | loosely associated one with the other. Occurrence:district). Japan—Tajima AKERITE AIKINITE or BELONITE...light. SG 3-6. USSR—Ural Occurrence: Burma.SriLanka. Mountains. Igneous rock of the ultrabasic clan...of nepheline and garnet. Occurrence: Portugal—Province of Al garve. ALBITITE Igneous rock of the syenite...coarse detrital materials, such as silt, sands andgravels, laid down by a stream, interbedded with finer-textured...Occurrence: USA—Colorado (Red Cloud Bluish or violet-redgem variety of spinel. Mine in Boulder County), North | | | Book (edition) | | complete cross index of f a mili argemnames. Information on eac hgemincludes chemical formula , c rystal...represent today's most sophisticated tech niquesforgem photography. Resul ti ng fromhis own three-year...three-year effort, they showthe exact color o f facetedgem stoneswhile displaying to best advantage thecut...clearly reveali ng thedegree of b1ref ringence in agem , aswell as any 1nclus1onsSome of the data provided...lished before, such as thed1spers1on valu es for 15gem ma terial s.These values are calculated fr o mmaterial |  | | Book | | GEMSTONES FOR EVERYMAN by the same authorGEM TESTING{8th revised editionpublished in 19JIby...12^)A.Granite with topaz crystalB.Ceylongem gravelC.Corundum groupD.Chrysoberyl and spinel...Removing the overburden covering diamondiferousgravels oncoast of South West AfricaII ILLUSTRATIONS...copyright facilities.For the picture of Ceylongem gravel I have to thank my old friendMr. R. K. Mitchell...in certain of their varieties, quite important asgem materials.This may well astonish an innocent reader |  | | Book (edition) | | Wilson } PIKES PEAK LIBRARYDISTRICT __NOLONGER °OPERTYOF PPLp aGEM MATERIAL THIRD EDITION Revised...WEI SISGiriFENG NAVI Se aleeee Hardness eer ofgem materials ce iv cage Sel mere ate rga in ascending...walelsy Sapiee Waves xlLeh Specificgravities ofgem materials in ascendingorder (including hardness &...wnaBole ee eo143 Refractive Cmeon indices ofgem materials in ascending erOscaysOrlmportant demolocical...significantly to the knowledge and understanding ofgem materials andgem cutting techniques. They were pioneers of |  | Fetherston, J. Michael, Stocklmayer, Susan M., Stocklmayer, Vernon C., Fetherston, J.M., Stocklmayer, S.M., Stocklmayer, V.C. (2013) Gemstones of Western Australia.Mineral Resources Bulletin 25 (1st ed.). Geological Survey of Western Australia | Report (edition) | | dmp.wa.gov.au/GSWApublicationsCover photograph:Gem-quality, fancy yellow, rough, sawable diamonds (average...................... 21East Kimberley DiamondProvince.................................................................... 24East Kimberley DiamondProvince................................................................... 24North Kimberley DiamondProvince ................................................................... 26West Kimberley DiamondProvince.............................................. |  | | Book (edition) | | Taylor,Correspondence CourseDiamondHANDBOOKOFGEMIDENTIFICATION10th EditionRichard T. Liddicoat...may be encountered inEnglish literature or in thegem, jewelry or art trades.BYROBERTM. SHIPLEY...Founder, Gemological Institute of Americaand AmericanGem SocietyASSISTEDBYThe late ANNA McCONNELL BECKLEY...Edward H. Kraus, coauthor ofMineralogy and Gems &Gem Materials; Dr. G. F. HerbertSmith, author of Gemstones...developments have occurredin the production of syntheticgem materials. Theseand other pertinent data have been |  | | Book (edition) | | is collecting residual heavy minerals in loosegravels onslopes or in streambeds, a shovel, a sieve,...thousands of years of erosion. Diamondbearinggravels in many parts of the world are thought to have...sands4g?Environment: Mainly in grains andandgravels.Crystal description: Crystals (octahedrons and...of the diamonds found aresaid to be suitable forgem use; the balance are used in industryfor tools and...—it also occursin thin veins. Madagascar andSriLanka (Ceylon), where itforms large pure masses in |  | | Book (edition) | | are few, with Monte Somma and Ger1nany's EifelDistrict (around the Laacher See) preeminent sites. Contact-metamorphic...(a deposit of heavy mineral residues in streamgravels). A low-grade deposit (one whose mineral deposits...thousands of years of erosion. Diamond-bearinggravels in several parts of the world (the Amazon and Orinoco...placer 1nineral in grains and nuggets in sands andgravels. Now n1ined from a mafic rock in South Africa and...percent of the dian1onds found are suitable forgem use, in fact the percentage is far higher, with Indians | | | Book (edition) | | are few, with Monte Sommaand Germany's EifelDistrict (around the Laacher See] preeminent sites. Contact-metamorphic...(a deposit of heavy mineral residues in streamgravels].A low-grade deposit (one whose mineral deposits...thousands of years oferosion. Diamond-bearinggravels in several parts of theworld (the Amazon and Orinoco...nuggetsmined from a mafic rock inin sands andgravels.South Africa and one of the sought-after metals...20 percent of the diamonds found are suitable forgem use, in factthe percentage is far higher, with Indians |  | | Book (edition) | | REFERENCE BOOK (1947)By Robert M. ShipleyHANDBOOK OFGEM IDENTIFICATION (2nd Edition, 1948)By Richard T....preparation)By Dr. Sydney H. BallPROPERTIES OFGEM VARIETIES OF MINERALS(posthumously 1948)Dr. Edward...may be encountered inEnglish literature or in thegem, jewelry or art trades.BYROBERT M. SHIPLEYFounder*...Founder* Gemologicat Institute of Americaand AmericanGem SocietyASSISTED BYANNA McCONNELL BECKLEYResearch...co-author of:;;M eralogy, and Gems andGem Materials; G. F. HerbertSmith, author of Gemstones |  | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997)Dana's New Mineralogy (8th ed.). Wiley-Interscience. p.1872 | Book (edition) | | British ColumbiaNFLabrador(part of NewfoundlandProvince)MBManitobaNBNew BrunswickNFNewfoundland...Co., Bonanza mine, Trinity Co., Michigan Bluffdistrict, Placer Co., in AK, placers at Fairbanks, Iditarod...andquartz veins at Juneau. In Canada, Norandadistrict, PQ; Porcupine, Kirkland Lake, and Larder Lake...deposits, ON; Atlin and Caribou, BC; and Klondikedistrict, YT. In Mexico, Altar and Magdalena, SON; Parral...localities, AZ; Calicodistrict, San Bernadino Co., Cerro Gordo(*), Inyo Co., Bodiedistrict, MonoCo., and other |  | | Book (edition) | | bfr encountered inEnglish literature or in thegem, jewelry or art trades.BYROBERT M. SHIPLEYFounder...Founder, Gemological Institute of Americaand AmericanGem SocietyASSISTED BYanna McConnell beckleyResearch...Kraus, co-author of MinV eralogy, and Gems andGem Materials; G. F. HerbertSmith, author of Gemstones...especially distinctive from those of theentiregem mineral species under which the propertiesIX are...macroscopic inclusions in sagenitic quartz and othergem¬stones.S.G.3.0-3.2.R.I.1.61/1.64.acute. Sharply |  | | Book (edition) | | expressed in abbreviations:Rep. (republic), prov. (province), co. (county), munic.(municipio), pref. (prefecture)...dept. (departement),dept. (departamento), dist. (district). Less commonterms are not abbreviated, e.g....the revolution in 1997. Its mineral richKatangaprovince was renamed Shaba by Mobutu, andis now the Katanga...Katanga administrative region again. Theformer Kivuprovince is now divided to three regions:INTRODUCTION...conditions in the gold-bearing "greenstone" in Abitibiprovince in northern Ontario and Quebec. Some genetic problems |  | | Book (edition) | | portion of an ore that is not economicallyvaluable.gem A mineral that possesses intrinsic value because...Colorado atthe Pelican Dives m.ine, Silver Plumedistrict, and at theLittle Emma mine, Clear Creek County;...lode,Summit County, and in the Cripple Creekdistrict. It isalso found in Canada; Mexico; Bolivia;...Califo1nia; in sodalite-syenite in the Julianehaabdistrict, Greenland; inthe liparite lavas of the island...slateand metamorphosed dolomite in the Beiyun-Obodistrict, Inner Mongolia, China, associated with aegirine | | | Book (edition) | | portion of an ore that is not economicallyvaluable.gem A mineral that possesses intrinsic value because...Colorado atthe Pelican Dives mine, Silver Plumedistrict, and at theLittle Emma mine, Clear Creek County;...lode,Summit County, and in the Cripple Creekdistrict. It isalso found in Canada; Mexico; Bolivia;...California; in sodalite-syenite in the Julianehaabdistrict, Greenland; inthe liparite lavas of the island...slateand metamorphosed dolomite in the Beiyun-Obodistrict, Inner Mongolia, China, associated with aegirine |
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