 | | Report (chapter) | | from the Rakwana area in the Ratnapura (Sinhalese: ‘city of gems’) District, in the Sabaragamuwa Province...Province of Sir Lanka (formerly Ceylon). Baddeley then submitted these samples to Mr Pringle of the Museum...This is clearly one of the better samples from Rakwana, Ceylon and shows some crystal faces from which...geikielite is Rakwana, Ratnapura District, Sabaragamuwa Province, Sri Lanka, a gem-mining district (Back 2018)...2018). Sabaragamuwa Province in Sri Lanka is, in fact, the centre of gem mining in Sri Lanka. Archean |  | | Journal (article/letter/editorial) | | of Beryllium and Fluorine in the Gem Fields of Sri Lanka M. S. Rupasinghe 1, A. Banerjee 1, j. Pense 1...Peradeniya, Sri Lanka Abstract. A study of the abundance of Be in the gem sediments of Sri Lanka shows that...pegmatites of the Highland and Southwest Groups of Sri Lanka, very little decomposition of the Be-bearing minerals...granites and pegmatites of the Precambrian of Sri Lanka are presumed to have been formed due to the magmatic...rocks abundant in the main gem bearing areas of Sri Lanka. Fluorine is found in the range of 400-2,000 ppm |  | | Journal (article/letter/editorial) | | are known from the Rubikon mine in the Karibib district of the Erongo region. The GIA collection has two...cat’s-eye, from left 11.40, 8.02, and 9.60 carats, Sri Lanka, India, and Myanmar (Burma). No polarizer. GIA...greenish-yellow—coming from Mwami in the Karoi (Urungwe) district of Mashonaland West. Asia India Although transparent...carats and 10.51 carats, Mwami, Karoi (Urungwe) district, Mashonaland West, Zimbabwe. GIA Gübelin collection;...dramatic yellow to blue pleochroism. Sri Lanka Like India, Sri Lanka is a notable producer of cat’s-eye |  | | Journal (article/letter/editorial) | | ratios to gem exploration in the granulite belt of Sri Lanka S.J.K. Gamage a, M.S. Rupasinghea and C.B. Dissanayake...Road, Kandy, Sri Lanka bDepartrnent of Geology, University of Peradeniya, Peradeniya, Sri Lanka (Received...ratios to gem exploration in the granulite belt of Sri Lanka. J. Geochem. Explor., 43:281-292. The geochemical...and strontium in the central granulite belt of Sri Lanka, where many of the gem deposits are found, was...minerals that are mined at present are corundum, spinel, zircon and tourmaline. It was observed that higher |  | | Journal (issue) | | 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...(1977) classified the brown tourmalines from Sri Lanka as uvite and dravite: Results For the analyses |  | | Journal (article/letter/editorial) | | in stream sediments of a granulite terrain in Sri Lanka — evidence for a mineralized belt Rohana Chandrajith...Geology, UniÕersity of Peradeniya, Peradeniya, Sri Lanka Received 17 March 1999; accepted 11 May 2000 ...located in a high-grade metamorphic terrain of Sri Lanka have been analysed for their major and trace element...Stream sediment; Geochemistry; Walawe Ganga Basin; Sri Lanka 1. Introduction ) Corresponding author. Fax:...Faculty of Applied Sciences, Sabaragamuwa University of Sri Lanka, Buttala, Sri Lanka. The Walawe Ganga ŽGanga |  | | Journal (article/letter/editorial) | | processes. The charnockites of the Highland Group of Sri Lanka represent this type and show genetic relationships...aluminous metasediments such as those found in Sri Lanka result in the formation of an assemblage of gem...gem minerals such as sapphirine, cordierite, spinel, ruby and corundum. The pegmatites with which gem...charnockitic parent. 1. I n t r o d u c t i o n Sri L a n k a is well k n o w n for its s e d i m e n...varieties o f c o r u n d u m , c h r y s o b e r y l , spinel, garnet, beryl, t o u r m a l i n e , t o p a z |  | | Journal (article/letter/editorial) | | Sediment Geochemistry of the Walawe Ganga Basin of Sri Lanka - Implications for Gondwana Mineralization Rohana...Geology, University of Peradeniya, Peradeniya, Sri Lanka * Corresponding Author (Manuscript received September...western-part of the Walawe Ganga (river) Basin in Sri Lanka is represented in this paper. The river basin...Walawe Ganga Basin, Sri Lanka. Introduction More than 90% of the island of Sri Lanka is made up of amphibolite...(1994) revised the subdivisions of Precambrian Sri Lanka based on the geochronological, petrological and |  | | Journal (article/letter/editorial) | | THE ORIGIN OF GEMSTONES TISSA MUNASINGHE OF SRI LANKA AND C. B. DISSANAYAKE Department of Geology...Geology, University of Peradeniya,Peradeniya,Sri Lanka Sri Lanka is well known throughout the world for its...gemstonesdominated by varieties of corundum, ½hrysoberyl,spinel, garnet, beryl, tourmaline, topaz, and zircon....Largescale gem mining is confined mainly to the Ratnapura and Elahera areas (Fig. 1). In most local- ities...(Dahanayake et al., 1980). The gem-bearing beds in the Ratnapura area are mostly alluvial in origin and consist |  | | Journal (issue) | | 28 ct blue spinel, (6) 1.17 ct benitoite, (7) 2.14 ct blue sapphire, (8) 23.18 ct blue spinel, (9) 4.82...8.04 ct orange sapphire, and (18) 3.48 ct pink spinel. The necklace contains 25.85 ct of radiant-cut...(Brazil and Colombia), central and southern Asia (Sri Lanka, India, Afghanistan, Pakistan, Russia, and China)...[both jadeite and nephrite], opal, peridot, quartz, spinel, tanzanite, topaz, and tourmaline). Locality information...come from a number of sources, but predominantly Sri Lanka. Accented with smaller diamonds, the 129 gem corundums |  | | 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...price and grew ever scarcer in world markets, red spinel and pink-to-red tourmaline became sought-after...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 |  | | Journal (issue) | | Number 2 TABLE OF CONTENTS FEATURE ARTICLES 62 Sri Lanka: The Gem Island Peter C. Zwnan The Identification...a n y fine gemstones found on the island o f Sri Lanka, the subject of Peter Zwaan's article i n this...this issue. This fine 9.57-ct cabochon from Sri Lanka is pictured here against a 19th century lithograph...from synthetic corundum, opal, alexandrite, a n d spinel, a s well as diamonds from simulants. mining,...t s Synthetic Alexandrite Natural and Synthetic Spinel Major Gem Locations and Production: Muzo, Colombia-the |  | | Report (issue) | | c = 5.024(4) Z=4 X-ray Powder Pattern: Rakwana, Sri Lanka. 2.92 (100), 1.516 (35), 1.721 (30), 3.61...Hf)O2 Total (1) 56.30 43.97 100.27 (1) Rakwana, Sri Lanka; by electron microprobe, average of 50 analyses...geikielite, spinel, perovskite. Distribution: Name: From Rakwana, Sri Lanka. For Sri Lanka, the country |  | | Report (issue) | | 01 (3) 33.54 Total 100.28 99.7 100.00 (1) Sri Lanka. (2) Bergell zone, Switzerland/Italy; by electron...gem-bearing placer deposits. Association: Rutile, spinel, clinohumite, perovskite, diopside, serpentine...calcite. Distribution: From the Rakwana and Balangoda districts, Sri Lanka. At Baltistan, Kashmir, Pakistan...Kimberley, Cape Province, South Africa. From north of the Mahogany mine, Hartley district, Zimbabwe. Several |  | | Journal (issue) | | Summer 2019 Issue 43 All About Colored Gemstones Spinel In All Shades & Sparkling Colors A Publication...Jewelry Industry Special Spinel Pink and Red Gem Spinels in Marble and Placers Spinel from Tajikistan – The...Spinels from Sri Lanka 54 The Spinels of Mahenge, Tanzania In Search of Cobalt Blue Spinel in Vietnam Spinel...Spinel Inclusions – An Exercise in Aesthetics Spinel – A Gemstone for Kings 66 InColor InColor is the...Responsibility 94 Book Review Discovering the Gems of Sri Lanka 98 100 108 113 Members 14 Saurabh Bansal Damien |  | | Journal (issue) | | Montana 34-43 Mines and minerals of the Georgetown District, Grant Co., New Mexico 44-50 Chalcopyrite, French...the Ophir District, Tooele Co., Utah 65-69 Minerals of the Singer mine, Goodsprings District, Clark Co...Joseph Baddeley gevonden in Kommonnangam, Rakwana, Sri Lanka, en beschreven door Fletcher. Bijna gelijktijdig...type-vindplaats ligt in Sri Lanka (het vroegere Ceylon) : Kollonnagam, Rakwana, Sabaragamuwa Province. Het typemateriaal...perovskiet, roze kwarts, spessartien, spinel, zirconoliet. Rakwana is daarenboven de type-vindplaats voor |  | | 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 |  | | Book | | extensive native plantations in the Northern Province, especially in the Jaffna Peninsula and the outlying...and December, the rainy season of the Northern Province. Sugar or “jaggery ” is prepared from sweet toddy...stone inthe Western Province, or of tamarind wood in the North-Central Province; in this a heavy pesile...to one family of ivory workers in the Kegalla District. The little figures of the last King of Kandy...Chief Priest are said to be contemporary portraits. Sri Wikrama Raja Sinha was the last king of the Suluwansa |  | | Journal (issue) | | Prospectors' Guide Map to the Gem Deposits of Sri Lanka C. B. Dissanayuke and M.S . Rupasinghe Two Treated-Color...of metamorphic origin (from localities such as Sri Lanka, Myanmar, Please see LETTERS, p. 226 Figure B...society, were Bahrain in the Persian Gulf, Ceylon (now Sri Lanlza), and Australia. Freshwater pearls came from...sapphires were coming from Kashmir (figure 71, Ceylon (Sri Lanlza), Australia, and the U.S. The American ' N...collector J.(ohn)P.(ierpont) Morgan. Aquamarine and red spinel are also found in Edwardian jewelry. The Edwardians |  | | Journal (article/letter/editorial) | | centre of Ceylon in the South Central, Uva, and Sabaragamuwa provinces. In this area rise lofty and often...s i t s , especially near Ratnapura and Rakwana in the Sabaragamuwa district. Here the gravels are very...rough gems occurring in the gravels at Ratnapura and Rakwana, c o r u n d u m is abundant and very often...(elongated grains), hypersthene, garnet, magnetite, and spinel. The magnetite is fairly abundant, and usually...strips of resinous-looking, dark green, isotropic spinel. Occasionally very small portious of this green |  | | 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...Garnet. 29, 30, 97, 125, 141 Gem Searching in Sabaragamuwa. Ill, 119 Gems in Ceylon ...12, 26, 59, 67,...104 Rakwana ... ... ...67, 72, 129 Ramboda ... ... ... ... 140 Rangala ... .2, 31, 104 Ratnapura 7, 28...184 .30, 98, 121, 140 30, 104 2, 33, 53, 104 Sabaragamuwa, Gold & Gems 7, 28, 33. 43,59, 67, 106, 111 |  | | Journal (issue) | | jadeite (green), peridot, spinel (red, green, blue and synthetic blue spinel) and zircon (high and low...supplier, the fluorite was mined from Cao Bang Province, northeast of Yen Bai. The crystal surfaces were...29.05 ct fluorite is reportedly from Cao Bang Province in northern Vietnam. Photo by Bilal Mahmood. ...yellow-green grossular from Kambanga, Taita-Taveta District, Voi, Kenya, is notable for having a significantly...at the Tourmaline Queen mine, also in the Pala District (e.g. Larson, 2012). So far, approximately three |  | | Journal (issue) | | not changed colour. The other stones are from Sri Lanka and are not treated; they weigh 9.85 ct (green)...mine, Kha district Looi mine, Kha district Looi mine, Kha district Looi mine, Kha district Notes Natural...mine, Kha district Finest. Only white after initial heating 6 7 Various, Champasak district Various...Champasak district 8 9 Various, Champasak district Pailin district 10 11 12 Looi mine, Kha district Looi...Looi mine, Kha district Various, Champasak district White stones after full heating Pre-heated to facilitate |  | | Journal (issue) | | JOURNAL OF THE GEMOLOGICAL INSTITUTE OF AMERICA Sri Lanka: Where Tradition and Technology Meet Characteristics...Tomorrow 173 Duncan Pay FEATURE ARTICLES 174 Sri Lanka: Expedition to the Island of Jewels Andrew Lucas...Pedro Padua pg. 175 Offers a firsthand look at Sri Lanka’s mining, cutting, jewelry manufacturing, and...colored stones. 228 Nephrite Jade from Guangxi Province, China Zuowei Yin, Cui Jiang, M. Santosh, Quanli...article in this issue examines the revitalization of Sri Lanka’s gem and jewelry industry, achieved by combining |  | | Journal (article/letter/editorial) | | areas which have been mapped : Ratnapura Sheet (Western half), Rakwana sheet (Western half). Gampaha sheet...which minerals such as forsterite, phlogopite, spinel, diopside, graphite are commonly present. Mineral...-phlogopite. 2. Calcite( ±)dolomite-forsterite-spinel-phlogopite. 3. Calcite( ±)dolomite-forsterite-diopside-phlogopite...hornblende, and spinel, is recorded in this class. Mineral assemblage : hypersthenehornblende-spinel. Ccr/ ...Calcite-dolomite. "j Calcite(±)dolomite-forsterite-spinel. \ (Calcareous) Calcite( ±)dolomite-diopside-forsterite |
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