 | | Journal (issue) | | from from the rhyolite matrix, are often trapped. Quartz, goethite and even two- and three-phase inclusions...Laboratory', but many gemmologists make the journey to Sri Lanka or Thailand at least once in their lives, if not...observations on brown tourmalines from Elahera, Sri Lanka Ulrich Henn and Martin Schramm Institut für...description of brown tourmalines from Elahera, Sri Lanka. They were classified as uvite and dravite as...deposits are located in the Uva region, in the Ratnapura district and in the Tissamaharma area (Dunn, 1977 |  | | Journal (issue) | | (Brazil and Colombia), central and southern Asia (Sri Lanka, India, Afghanistan, Pakistan, Russia, and China)...jade [both jadeite and nephrite], opal, peridot, quartz, spinel, tanzanite, topaz, and tourmaline). Locality...come from a number of sources, but predominantly Sri Lanka. Accented with smaller diamonds, the 129 gem corundums...They built fires under massive aquamarine-bearing quartz bodies, and then threw water onto the heated rock...Boehm, March 1993. the alluvial gem fields of Sri Lanka and the pegmatite districts of Brazil. Efforts |  | | Journal (issue) | | instrumentation such as LA-ICPMS—once primarily the province of academia—became a fixture in many gemological...were combined under the jurisdiction of the U.S. District Court of New Jersey 168 PRODUCTION AND MARKETS...addition to the traditional spinel sources of Sri Lanka, Pakistan, and Myanmar (spinel, if polished elsewhere...start operations at the Kagem mine in the Kafubu District, historically Zambia’s largest source of emeralds...ultimately decided in eBay’s favor when the U.S. District Court of New York determined that the burden of |  | | Book | | notable example in this category is the Nuristan District of Afghanistan, which over the past 10 years has...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,... Hyuga Province, Miyazaki Prefecture, Kyushu Otome Mine, Suisho Pass, Kurobera, Kai Province, Yamanashi...Prefecture, Honshu Mino Province, Gifu Prefecture, Honshu; and Omi Province, Shiga Prefecture, Honshu |  | | Journal (issue) | | Prospectors' Guide Map to the Gem Deposits of Sri Lanka C. B. Dissanayuke and M.S . Rupasinghe Two Treated-Color...York, PA; Richard P. Ellis, Missoula, MT; Sandra Rose Engeberg, Los Angeles, CA; Frank Ernst, Scottsdale...MI; Suzanne Rizzo, Commerce Twp., MI ; Charles L. Rose, Germantown, TN; Aimee Roseberry, West Des Moines...of metamorphic origin (from localities such as Sri Lanka, Myanmar, Please see LETTERS, p. 226 Figure B...new cuts. Prior to 1900, most diamonds were cut in rose, old mine, round brilliant, oval, cushion, and pear |  | | Book | | Enterprise as carried on, chiefiy in the Sabaragamuwa district; to the splendid opportunity presented for...round off the list of precious things for which Lanka and Serendib have been famous from time immemorial...Corundum ... ... 30, 98, 123, 140 Cost of Crushing Quartz . 5 Cost of Labour . 8 Cradle tor Washing Gold...to Minerals . 68 Crushing Gold 65, 158 Crushing Quartz, Cost of .. *•• o Crystal .. 29, 30, 96 Cupellation...Garnet. 29, 30, 97, 125, 141 Gem Searching in Sabaragamuwa. Ill, 119 Gems in Ceylon ...12, 26, 59, 67, |  | | Journal (issue) | | Spinels of Mogok – A Brief Overview Spinels from Sri Lanka 54 The Spinels of Mahenge, Tanzania In Search...Responsibility 94 Book Review Discovering the Gems of Sri Lanka 98 100 108 113 Members 14 Saurabh Bansal Damien...Shirley Xue Li Zhang, Hong Kong E. Gamini Zoysa, Sri Lanka Advisors Jean Claude Michelou, Colombia Ruben...countries, as well as Ilakaka in Madagascar and Sri Lanka (Langerwey, 1974; Gorghinian et al., 2013). Until...in Sri Lanka for which the nature of the primary deposits is still unknown. Except for Sri Lanka, Image |  | | Book | | 120) Page 6: Mimetite (see page 139) Page 248: Quartz (amethyst variety), Erongo Mountains, Namibia *...Earth’s crust are composed ofjust a few minerals; quartz and the feldspar group are the most abundant processes...A CHANGING PLANET 11 Vanadinite, San Carlos district, Chihuahua, Mexico * 8 x 4 x 2 cm Mineral Species...growth, as exemplified by tourmaline in schist, quartz or phlogopite. Space for Growth Cavities in rocks...about the same time, as happens with pyrite and quartz, or they may have grown one after the other, as | | | Book | | 120) Page 6: Mimetite (see page 139) Page 248: Quartz (amethyst variety), Erongo Mountains, Namibia *...Earth’s crust are composed of just a few minerals; quartz and the feldspar group are the most abundant species...periods of stability PLANET | 114 San Carlos district, Chihuahua, Mexico * 8 x 4 x 2 om are uncommon...growth, as exemplified by tourmaline in schist, quartz or phlogopite. Space for Growth Cavities in rocks...about the same time, as happens with pyrite and quartz, or they may have grown one after the other, as |  | | Book | | example is very rare indeed compared to salt or quartz, but not compared to ruby, the particular conditions...of it crystallizes as free silica in the form of quartz, as in a granite. Along with the increasing silica...crystals (resembling bamboo stalks) in some emerald, quartz and garnet • anatase in rock crystal • apatite...fuchsite in quartz, emerald and corundum pyrite in corundum and emerald rutile in quartz spinel in ruby...diamond. Pegmatite minerals such as apatite and quartz may be found in another pegmatitic mineral, aquamarine | | | Book | | example is very rare indeed compared to salt or quartz, but not compared to ruby, the particular conditions...of it crystallizes as free silica in the form of quartz, as in a granite. Along with the increasing silica...crystals (resembling bamboo stalks) in some emerald, quartz and garnet • anatase in rock crystal • apatite...fuchsite in quartz, emerald and corundum pyrite in corundum and emerald rutile in quartz spinel in ruby...diamond. Pegmatite minerals such as apatite and quartz may be found in another pegmatitic mineral, aquamarine |  | | Book | | known to 1umankind since prehistoric times such as quartz 1nd gold, but also ~minerals first described quite...secondary. It occurs with pyrite, arsenopyrite, quartz, sylvanite, calaverite, krennerite and other minerals...in many localities in California, USA (Colorado Quartz mine, Nigger Hill and others). Fine leaf gold comes...(3 1/R in) and imperfect crystals were found in quartz veins in Allin, British Colwnbia, Canada. Fine...California, USA Foliated aggregates are found in Sri Lanka (Radegara, Galle region). Accumulations in Buckingham |  | | Book | | known to humankind since prehistoric times such as quartz and gold, but also minerals first described quite...secondary. It occurs with pyrite, arsenopyrite, quartz, sylvanite. calaverite. krennerite and other minerals...in many localities in California, USA (Colorado Quartz mine. Nigger Hill and others). Fine leaf gold comes...mm (37s in) and imperfect crystals were found in quartz veins in Atlin, British Columbia, Canada. Fine...California. USA Foliated aggregates are found in Sri Lanka (Radegara, Galle region). Accumulations in Buckingham |  | | Book | | natural, cultured and imitation Alexander E. Fam Quartz Michael O'Donoghue In preparation Diamond Roy... Major sources: Burma, Thailand, Cambodia, Sri Lanka, India, Australia, Kenya, Tanzania, Montana and...Stone Tract in Upper Burma to the gem gravels of Sri Lanka, we find the historical occurrences of rubies...Burma 67 Sapphire - Burma 75 Ruby and sapphire - Sri Lanka 77 Ruby - Thailand and Cambodia 80 Sapphire -...273 Sri Lanka (Ceylon) 273 History 273 Mining areas 276 Mining methods 278 The market in Sri Lanka 280 |  | | Book | | finest star ruby on public display. A product of Sri Lanka's gem gravels, today it resides at the Smithsonian...origin is uncertain, but probably emanates from Sri Lanka. Today it rests in New York's Amer1can Museum...473 History 474 Luc Yen 474 Quy Chau (Bu Khang District) 475 Other Vietnam corundu.n1 localities 478 Mining...History 390 Ruby & sapphire variecies 395 Origin of Sri Lanka's corundum deposits 395 Mining areas 396 Mining...marker in Sri Lanka 399 Characteristics of Sri Lanka.n corundLm1s 402 Bibliography- Sri Lanka 405 C Ruby |  | | Book (edition) | | in brackets) arc shown in the following list: Sri Lanka (Ceylon), Malagasy Republic (Madagascar), Kampuchea...reflection of light in 3 a stone 9 Diamond 9 4 Quartz 10 5 Path of rays in a brilliant 10 6 Dispersion...dichroscope 15 The brilliant 20 The step cut 20 The rose cut 21 The briolette 21 The marquise 21 The pendeloque...Rhombic dodecahedron 49 lcositetrahedron 49 Group of quartz crystals 63 Plates 1 2 3 4 5 6 7 8 Corundum... 58 Jade Faci11g p. 58 Opal group Facing p. 59 Quartz group Faci11g p. 59 Figure 1 Plan of the Gemstone |  | | Journal (issue) | | and from historical gemmology in Afghanistan, Sri Lanka or the UK to the criteria for distinguishing natural...the Chuncheon area, north east of Seoul, in the Province of Kangwondo, which is in the central part of...light, similar to those from Sri Lanka. The key difference between Burma and Sri Lankan sapphires is saturation...specimens are known, including a 40.3kg crystal from Sri Lanka which contains gemmy portions (see Table II)....Louis XIV. Said to be Bengal; probably Burma or Sri Lanka Date unknown Museum National D'Histoire Naturelle |  | | Journal (issue) | | yellow to brown and bluish white sapphire from Sri Lanka, known as geuda, could be transformed to a fine...concentration of iron. The 1.40 ct heat-treated Sri Lankan sapphire on the right is colored by Mg2+-trapped-hole...like Mg2+. The heat-treated yellow sapphires of Sri Lanka and the natural-color or heattreated yellow portions...colorless sapphire that results from heat treating some Sri Lankan geuda. In such stones, we have the condition...cases of Montana alluvial sapphire, Sri Lankan sapphire, and Sri Lankan geuda, there are many stones |  | | Report (issue) | | —The Mineral Resources of the North-West Frontier Province. By A. L. Coulson. (Prioe As. 14 or la. 3d.) No... ♦ Iter: Indian Precious Stones. Packs. XVII. Quartz .... . 41 41 Introduction . 41 Uses .... 41— 42...Another form of cut used for the diamond is the rose cut for small and flat stones. (ii) For coloured...after showers of rain at Wajra Karur, Anantapur district. There is an igneous pipe or neck, of bluish tuff...pebbles derived from the Bijawar formation and vein quartz similar to that found in the Bundelkhand granites |  | | Journal (issue) | | Franks, B.Sc., Ph.D., F.G.A. South Yorkshire & District Branch: J. L Platts, F.G.A. Examiners: E. A. Jobbins...(1981): Unstable colour in a yellow sapphire from Sri Lanka. J.Gemm., XVII, 8, 615-18. (4) Scarratt, K. (1981):...and Burma rubies and even the lighter pink of Sri Lanka corundums (pink sapphires). Therefore this least...the length of the crystal. There is evidence of quartz inclusions, and part of the matrix (biotite mica)...in August 1983 had attacked a mine in Zambezia Province, where they had killed two Soviet geologists and |  | | Journal (issue) | | Micro-World Actinolite in spinel • Bavenite in quartz • Diamond with mobile green diamond inclusion •...Montana and Australia • Blue sapphire from Rakwana, Sri Lanka • Trapiche gems • Carvings from Bali • Carvings...Czochralski method. Also shown is a fine 4.10 ct unheated Sri Lankan blue sapphire, representative of the color...Czochralski method. Also shown is an 11.41 ct unheated Sri Lankan yellow sapphire, representative of the color...primary cause of color for yellow sapphires from Sri Lanka and other sources where the iron content is not |  | | Book (volume) | | Drosdov and A.P. Turinge 331 Gems deposits of Sri Lanka E. Gaminee Zoysa 343 Precious and semi-precious...formation were found in Mimecha-Kotui carbonatite province. This deposits are not mining yet for their difficult...material. Only stable minerals of maternal rock, e.g., quartz, zircon, rubile and others are preserves without...kaolinite 8 clays (secondary kaoline) or pure quartz sands in fresh water basins. In case of saltwater...plastic clay (ball clay) deposits are forming. Quartz sands It is just sorting of elubial material related |  | | Book | | ,vhe re th.e inclusio ns of rutile ,vithin the quartz n1ay ~1dd to the rarity. desirabil ity. and value...cheap. For exan, ple, in Indo nesia, lvfala ysia, Sri La nka. a nd Ind ia, local inhabitants search ri...dep o.siL.s, .such a .s the ge1n grave ls o f Sri Lanka and Burma (Ivlyann1ar), contain ~1 d i, e rse...elsewhe re. Jetceler'.~ worksbop in the dia m ond district of 1\Ju mbai. I ndia CHINA China is in vesting...ts. \Xfuz ho u, a s n1a ll c ity in G ua ngxi Province, is China's largesL costun1e je w e lry cente |  | | Book | | Gem Diamond Synthesis 101 103 107 Irridation Rose Cut Synthesis Growth from Solution Glass 107...Early man undoubtedly discovered by accident that quartz and flint could be broken to produce sharp cutting...minerals have definite compositions; for example, quartz (rock crystal and amethyst) is silicon dioxide...amethyst, is so soft it the lovely.purple variety of quartz. For hundreds of of diamond, ruby, sapphire, and...beauty resulting from an internal display of colors. Quartz, one of the most abundant minerals on the earth’s | | | Book | | Introduction 108 Cabochon Cut 109 Faceted Cut 109 Rose Cut 111 Table Cut 111 Step or Emera ld Cut Brilliant...Early man undoubtedly discovered by accident that quartz and flint could be broken to produce sharp cutting...minerals have definite compositions; for example, quartz (rock crystal and amethyst) is silicon dioxide...beauty resulting from an internal display of colors. Quartz, one of the most abundant minerals on the earth's...Therefore, ideally a gem should be harder than quartz, a qualification met by only 10 or 12 gemstones |
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