 | | Book (edition) | | 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 |  | | Book | | 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 | | | Book | | 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) | | 1 2 The Geological Sources of Gems Crystalline Gem Materials 3 40 Part II 3 4 5 6 7 8 9 10 11 12 13...The Biological Gem Materials The Fashioning of Gemstones Value-Enhanced Gemstones and Gem Materials 292...library for virtually all sources. Derivations of gem and mineral names are not given; they can be found...not now considered valid or current. While many gem collectors collect mineral specimens too, the text...text for the 1994 edition. In this new edition, the gem testing section has been omitted; this information |  | | Book | | TREASURES The IN THE SMITHSONIAN Gem Collection Paul E. Desautels ;".'*" - • * « . ^- - ...: »•• * . The Gem Collection TREASURES The IN THE SMITHSONIAN Gem Collection Paul E. Desautels...Paul E Treasures in the Smithsonian: the Gems. gem collection. Smithsonian Institution. Smithsonian...One of the more important gifts to the Smithsonian gem collection in recent years is the 68-carat Victoria-Transvaal...champagne-colored gem was discovered in Africa in 1951. CONTENTS I. II. THE NATIONAL GEM COLLECTION THE |  | | Journal (issue) | | 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 |  | | Journal (issue) | | Journal of Gemmology THE GEMMOLOGICAL ASSOCIATION AND GEM TESTING LABORATORY OF GREAT BRITAIN OFFICERS AND... R. Cavey, FGA The Gemmological Association and Gem Testing Laboratory of Great Britain 27 Greville Street...ISSN: 0022-1252 J. Gemm., 1991,22,8 458 THE GEM DIAMOND DIPLOMA GAGTL have brought together the finest...world of diamonds to produce the most comprehensive Gem Diamond home study course available. The course acknowledges...international diamond market and includes every aspect of gem diamond you will ever need to know. Following an |  | | Journal (issue) | | Branch: M. P. Gayton, F.G.A. South Yorkshire & District Branch: M. W. Eldridge, M.B., Ch.B., F.G.A. Examiners:...absorption in the visible region and most colourless gem quality diamonds contain substantial concentrations...using a hand spectroscope, Kenneth Scarratt of the Gem Testing Laboratory has observed (personal communication)...through Alec Farn of the London Chamber of Commerce Gem Testing Laboratory.I am also grateful to Mr Farn...Mohammed, K., 1981 (in preparation). Anderson, B. W., Gem Testing, 9th edn., p.211, London: Butterworths, 1980 |  | | Book | | Found in the Irkutsk area of Siberia, and in Sri Lanka, where it occurs in veins. Graphite crystals occur...Australia at Kalgoorlie; in the Cripple Creek district, Teller Co., Colorado and in Calaveras Co., California...pyrite, calcite and dolomite. Localities. Fine gem-quality material is found at Picos de Europa, Santander...Germany. Major economic deposits are in Honan Province, China, in Algeria and in Mexico. Treatment. Best...in Norway and with pyrrhotine in the Sud¬ bury district of Ontario; San Diego Co., California. Treatment |  | | Book (edition) | | complete cross index of familiar gem names. Information on each gem includes chemical formula, crystal...represent today's most sophisticated techniques for gem his own photography. three-year the exact color...clearly revealing the degree of birefringence in a gem, as well as any inclusions Some of the data provided...published before, such as the dispersion values for 15 gem materials. These values are calculated from...useful for gemologists. to Of practical interest to gem cutters isa special graph relating critical angle |  | | Journal (issue) | | of western U.S. locations, including the Little Gem amethyst scepter mine in Montana, the Fluorita Dulcita...Rhodochrosite on Manganite N'Chwaning Mine, Northern Cape Province, South Africa. 8.7 cm In 1978 a historic discovery...emeralds. It has long been a commonplace in the gem trade that the world’s 2709 E. Exeter Street,Tucson...2022 finest gem-grade rubies are those from the Mogok Stone Tract, and that Mogok’s gem-grade sapphires...the gemology, treatment, cutting and marketing of gem corundum from Mogok, and—as a kind of resonance of |  | | Book | | MALAWI Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...Administered Tribal Areas and North West Frontier Province. Ilmenite crystal clusters to 12 cm across have...of rutile (Weerth, 2004). Tonniq Valley, Skardu district, Gilgit-Baltistan [Northern Areas]. Beginning...hematite. Zagi [Zegi] Mountain, Warsak district, North West Frontier Province. Surface diggings worked by local...to 6 cm (2005: 120). Los Remedios mine, Taxco district, Taxco, Guerrero. Ilvaite occurs in the wallrock |  | | Catalog/List | | OCTOBER 15, 2015 ❘ NEW YORK The RAINBOW OF AFRICA GEM & MINERAL COLLECTION Front Cover: Gems from the...Signature® Internet Session 2 Heritage Auctions Design District Annex 1518 Slocum Street • Dallas, TX 75207 (HERITAGELive...57070. The next part of the catalog is the African gem collection – an unheard of gathering of some of the...a family determined to create the finest African gem collection the world has ever seen. And they succeeded...Warren Taylor Ian Taylor The RAINBOW of AFRICA Gem & Mineral Collection A three-generation collection… |  | | Book | | lapidary, tabulated compactly for easy reference. Gem-fashioning processes, too, are described -from simple...about the transformation thatturns a stone into a gem, wili find as much in this book as the enthusiastic...the bibliography of this book. The study of the gem materials, today universally known as gemmology,...mineralogy than with any other, since nearly all gem materials are minerals. However, gemmologists borrow...experience when attempting to identify a synthetic gem set in jewellery. But now that so many new materials |  | | Book (volume) | | research, and our knowledge of numerous aspects of gem behaviour has been increased as a consequence of...Glasses 15 Marble 16 Lesser Known Ornamental and Gem Materials 17 Synthetic Gemstones 18 Imitation...proved a useful elementary textbook on the subject of gem materials and their testing, a study now known as...properties of gem materials. They then go on to the theory and use of instruments used in gem-testing before...in the earth leads to descriptions of the various gem materials. Following this, there are chapters on |  | | Book (edition) | | expressed in abbreviations: Rep. (republic), prov. (province), co. (county), munic. (municipio), pref. (prefecture)...dept. (departement), dept. (departamento), dist. (district). Less common terms are not abbreviated, e.g....the revolution in 1997. Its mineral rich Katanga province was renamed Shaba by Mobutu, and is now the Katanga...Katanga administrative region again. The former Kivu province is now divided to three regions: INTRODUCTION...conditions in the gold-bearing "greenstone" in Abitibi province in northern Ontario and Quebec. Some genetic problems |  | | Book (volume) | | His works are known to almost every collector, gem cutter, gemologist, and mineralogist. His writings...newer events to bring the history of North American gem mining up to date. Here, then, is the latest, most...Systematic large-scale mining of sapphire-bearing gravels in Montana is beginning and is expected to produce...of turquoise and peridot, although for the latter gem, much larger facetable rough crystals appear with...will make it easier for readers to investigate the gem literature further or to obtain those references |  | 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 Columbia NF Labrador (part of Newfoundland Province) MB Manitoba NB New Brunswick NF Newfoundland...Co., Bonanza mine, Trinity Co., Michigan Bluff district, Placer Co., in AK, placers at Fairbanks, Iditarod...and quartz veins at Juneau. In Canada, Noranda district, PQ; Porcupine, Kirkland Lake, and Larder Lake...deposits, ON; Atlin and Caribou, BC; and Klondike district, YT. In Mexico, Altar and Magdalena, SON; Parral...localities, AZ; Calico district, San Bernadino Co., Cerro Gordo(*), Inyo Co., Bodie district, Mono Co., and other | | | Book (edition) | | complete cross index of f a mili ar gem names. Information on eac h gem includes chemical formula , c rystal...represent today's most sophisticated tech niques for gem photography. Resul ti ng from his own three-year...three-year effort, they show the exact color o f faceted gem stones while displaying to best advantage the cut...clearly reveali ng the degree of b1ref ringence in a gem , as well as any 1nclus1ons Some of the data provided...lished before, such as the d1spers1on valu es for 15 gem ma terial s. These values are calculated fr o m material | | | Book (volume) | | His works are known to almost every collector, gem cutter, gemologist, and mineralogist. His writings...newer events to bring the history of North American gem 1nining up to date. Here, then, is the latest, most...Systematic large-scale mining of sapphire-bearing gravels in Montana is beginning and is expected to produce...of turquoise and peridot, although for the latter gem, much larger facetable rough crystals appear with...will make it easier for readers to investigate the gem literature further or to obtain those references |  | | Journal (issue) | | THE GEMMOLOGICAL ASSOCIATION OF GREAT BRITAIN GEM MOL 0 G I CA LAS SOC IAT ION OF GREAT BRITAIN SAINT...or dark brown veins, but it is little known as a gem material outside the United States of America. T...northeast of Ventura County. T h e source of the gem material is, however, in Tick Canyon, an offshoot...find out whether it will turn to citrine colour for gem purposes. 4 illus. R.W. GROWNINGSHIELD (R.)« The...SHIELD (R.). Developments and Highlights at the Gem Trade Lab. in New Tork. Gems a n d Gemology, Vol |  | | Book (edition) | | org/details/handbookofgemideOOOOIidd HANDBOOK OF GEM IDENTIFICATION Books by the Same Publishers DICTIONARY...Martin, G. Robert Crowningshield 11 HANDBOOK OF GEM IDENTIFICATION Characteristic silk-like inclusions...of demantoid garnet. Frontispiece Handbook of GEM IDENTIFICATION by Richard T. Liddicoat, Jr. President...of America, founded in 1931, and of the American Gem Society, organized in 1934. For some time, however...supplied by Richard T. Liddicoat’s “Handbook of Gem Identification.” By his excellent scientific training | | | Book | | lapidary, tabulated compactly for easy reference. Gem-fashioning processes, too, are described — from ...about the transformation that turns a stone into a gem, will find as much in this book as the enthusiastic... in the bibliography of this book. study of the gem materials, today The is more as gemmology, universally...mineralogy than with any other, since nearly all gem materials are minerals. However, gemmologists borrow...experience when attempting to identify a synthetic gem set in jewellery. But now that so many new materials |  | | Book (volume) | | fringes of Greenland; in fact, there is no state or province which does not boast at least one gemstone worthy...contains all the basic information about the exciting gem resources of our continent. In careful, accurate...gemologists will find the latest and most accurate gem-identification data under each species. Finally,...unique and valuable reference by every collector, gem cutter, miner, geologist, mineralogist, jeweler,...was furnished by Col. E. M. Barron of the Southern Gem and Mineral Company of El Paso, Texas. Information |  | | Report (edition) | | dmp.wa.gov.au/GSWApublications Cover photograph: Gem-quality, fancy yellow, rough, sawable diamonds (average...................... 21 East Kimberley Diamond Province.................................................................... 24 East Kimberley Diamond Province................................................................... 24 North Kimberley Diamond Province ................................................................... 26 West Kimberley Diamond Province.............................................. |
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