 | | Report (chapter) | | in the Ratnapura (Sinhalese: âcity of gemsâ) District, in the Sabaragamuwa Province of Sir Lanka (formerly...is Rakwana, Ratnapura District, Sabaragamuwa Province, Sri Lanka, a gem-mining district (Back 2018).... Sabaragamuwa Province in Sri Lanka is, in fact, the centre of gem mining in Sri Lanka. Archean high-grade...developed at the expense of dolostones, chrome-spinel deposits and in gem gravels. In the majority of... brucite, calcite, rutile, zircon, sphalerite, spinel, pyrrhotite, baddeleyite and qandite (Ferry 1996; |  | | Journal (article/letter/editorial) | | are known from the Rubikon mine in the Karibib district of the Erongo region. The GIA collection has two...catâs-eye, from left 11.40, 8.02, and 9.60 carats, Sri Lanka, India, and Myanmar (Burma). No polarizer. GIA...greenish-yellowâcoming 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 GĂźbelin collection;...dramatic yellow to blue pleochroism. Sri Lanka Like India, Sri Lanka is a notable producer of catâs-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) | | 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 |  | | 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 â The...Spinels from Sri Lanka 54 The Spinels of Mahenge, Tanzania In Search of Cobalt Blue Spinel in Vietnam Spinel...Spinel Inclusions â An Exercise in Aesthetics Spinel â 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 |  | Giuliani, Gaston, Fallick, Anthony E., Boyce, Adrian J., Pardieu, Vincent, Pham, Van Long (2017) Pink and Red Spinels In Marble: Trace Elements, Oxygen Isotopes, and Sources. The Canadian Mineralogist, 55 (4) 743-761 doi:10.3749/canmin.1700009 | Journal (article/letter/editorial) | | the main productive and historical sources of gem spinel. Three consistent sets of d18O values were found...by combination with the O-isotope composition of spinel. The present study shows that it is possible to...and red spinel, trace elements, oxygen isotopes, geographic origin. INTRODUCTION Gem spinel belongs...belongs to the aluminous spinel subgroup A2ĂžB3Ăž2O4, where A represents Mg, Fe2Ăž, Zn, Mn, Ni, Co, Cu, and Ge...sites of the crystal structure controls the color. Spinel offers a wide palette of colors (Fig. 1) extending |  | | 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) | | 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 (article/letter/editorial) | | they are the possiblesourcerock for many of the Ratnapura-type gem depositsin this area. The cordierite...sillimanite+ corundum q- sapphirine Fro. 1. The Ratnapura gem area (outlined) in relation to the occurrences...are marked by a cross. SiO2 Ilmenite-magnetite, spinel,and zircon are ubiqquitousaccessory mineralsand...The sillimanite-corundum and similar sillimanite-spinel Fig. 2. Corundum Coexistingphasesin the systemSiO2-AI20...portrayed in the SiO2-A12Oa-MgOtriangle (Fig. 2). Ratnapura-type Gem Deposits Most of the gem fields are |  | | 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) | | abundance in the sedimentary gem deposits of Sri Lanka M.S. RUPASINGHE and C.B. DISSANAYAKE* Institut...abundance in the sedimentary gem deposits of Sri Lanka. Lithos, 17: 329-342. This study reports some...elements) data from the gem-bearing sediments in Sri Lanka. The REE in these placer deposits are highly enriched...marked similarity with those for charnockites in Sri Lanka as well as for charnockite-granite rocks in other...the Highland Group in which all gem fields of Sri Lanka are found. The element pairs Zr-Hf, Zr-Ce, Zr-Ti |  | Giuliani, Gaston, Fallick, Anthony, Rakotondrazafy, Michel, Ohnenstetter, Daniel, Andriamamonjy, Alfred, Ralantoarison, ThĂŠogène, Rakotosamizanany, Saholy, Razanatseheno, Marie, Offant, Yohann, Garnier, Virginie, Dunaigre, Christian, Schwarz, Dietmar, Mercier, Alain, Ratrimo, Voahangy, Ralison, Bruno (2007) Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium Deposita, 42 (3) 251-270 doi:10.1007/s00126-006-0105-3 | Journal (article/letter/editorial) | | Eastern Africa, India, and Sri Lanka is presented. Giant placer deposits from Sri Lanka, Madagascar, and Tanzania...gem corundum from Eastern Africa, India, and Sri Lanka is presented. Introduction For over 10 years...the main world producers of East Africa, India, Sri Lanka, Myanmar, Thailand, and Australia. Since 1993...from hand miners and exporting Malagasy rough to Sri Lanka and Thailand. The opportunity to establish the...central Madagascar and in the Ambohitra igneous province in the north, which includes the Nosy Be archipelago |  | | 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 fĂźr...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) | | Source Rocks of Gem Minerals A Case Study from Sri Lanka K. Dahanayake and A. P. Ranasinghe Department...Geology, Universityof Peradeniya, Peradeniya, Sri Lanka Field and laboratory studies on the geology and...of gem minerals such as topaz, corundum, beryl, spinel, tourmaline and zircon. Les travaux sur le terrain...tourmalines et zircons. INT RODUCTION The island of Sri Lanka consists mainly of Precambrian metamorphic rocks...northeastern coastal regions. The Precambrian of Sri Lanka has been divided into three major divisions by |  | | Journal (article/letter/editorial) | | of Sri Lanka K. Dahanayake Department of Geology, University of Peradeniya, Peradeniya, Sri Lanka The...The island of Sri Lanka is underlain primarily by Precambrian metamorphic rocks belonging to the Amphibole...cordierite gneisses, marbles and pegmatites. L'~le de Sri Lanka est formSe presque entiSrement des roches mStamorphiques...des pegmatites. INT ROD U CTION The island of Sri Lanka (formerly Ceylon) is underlain principally by...gneisses. The major gem fields of Sri Lanka Viz. Elahera and Ratnapura both lie in the Highland Group terrain |  | | Report (issue) | | 8819(5) c = 5.6813(4) Z=4 X-ray Powder Pattern: Sri Lanka. 2.14 (vvs), 1.621 (vs), 3.24 (s), 2.62 (s), 4...43 2.10 29.24 31.96 [100.95] 100.00 (1) Sri Lanka; corresponds to Mg1.02 (Al1.03 Fe3+ 0.03 )ÎŁ=1...Association: Spinel, serendibite, ludwigite, warwickite. Distribution: From Sri Lanka, in gem gravels...gravels, in the Ratnapura district, at Nivitigala, Balangoda, Nirialla; around Elahera and Eheliyagoda; and...Ontario, Canada. From the Kwakonje area, Handeni district, Tanzania. In the Tayozhnoye iron deposit, 550 |  | | Journal (issue) | | ......................................... 47 Sri Lanka ................................................Russia; Sant Enterprises, Thailand; Facets Show, Sri Lanka; Thai Gems and Jewelry Traders Association, Thailand;...Akira Ito, Japan SECRETARIES Ismail M. Kamil, Sri Lanka Jacqui Grande, USA DIRECTORS Andrew Cody, Australia...Namibia; Gamini Zoysa and Ismail Kamil, Colombo, Sri Lanka; TanzaniteOne Ltd.; South Africa; the Thai Gem...Masashi Furuya, Japan; Gem & Jewellery Authority of Sri Lanka; Jewellery Review Magazine, Russia; Prof. Mimi |  | Santosh, M., Katori, R., Yoshikura, S., Higash, S., Salim, A.K. (2002) Pink Sapphire from Southern Kerala, S. India: Implications on India-Madagascar Correlation Within Gondwana Assembly. Gondwana Research, 5 (4) 894-901 doi:10.1016/s1342-937x(05)70925-4 | Journal (article/letter/editorial) | | hues also occur in the Ratnapura gem district in the southwestern part of Sri Lanka. The pink sapphire occurrences...topaz, kornerupine, green and golden zircons, blue spinel, almandine and pyrope garnets, blue and green apatites...similar events recorded from adjacent terrains of Sri Lanka, Madagascar and East Antarctica within the East...and zircon from southern Kerala in South India, Sri Lanka and Madagascar and aquamarine, topaz, tourmaline...southern India and Sri Lanka into East Antarctica also represents a Pan-African gemstone province (Menon et al |  | | 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 Lankaâs 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 Lankaâs gem and jewelry industry, achieved by combining |  | | 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 (article/letter/editorial) | | form phlogopite a n d spinel: MgCO3 corundum--, spinel + CO2, fluid I + MgCO3 + spinel + scapolite--, phologopite...prevented complete conversion o f c o r u n d u m to spinel through reaction 2. Acknowledgements. The authors...are grateful to the National Science Council of Sri Lanka for providing funds for this project under grant...A. P.: Genesis of sedimentary gem deposits in Sri Lanka; Sediment. Geol. 25:105-115 (1980) Fyfe, W. S...pp. (1983) Katz, M. B.: On the origin of the Ratnapura gem deposits of Ceylon; Econ. Geol. 67:113-115 |  | | Journal (issue) | | Zircon Inclusions in Sapphires from Ratnapura and Balangoda (Sri Lanka) and Implications for Geographic...Grandidierite inclusions in sapphires ⢠Lazurite in spinel ⢠Fossil insect in opal ⢠Trapiche-like ruby from...⢠Colored stone trends ⢠Granada Gallery ⢠Gray spinel ⢠Greenland ruby ⢠Hand-carved cameos ⢠Moonstone...more about the age and origin of sapphires from two Sri Lankan alluvial deposits. Next, a team headed by...the 2017 news of sapphires from northern Tigray Province, prompted a 2018 GIA field expedition. Led by |  | | Journal (issue) | | from the fertile agricultural plain of the Mardan District in the neighborhood of a small village. This settlement...northeast of Peshawar and about 20 km north of the district capital Mardan "as the crow flies" (approximately...o f the topaz hill at Ghundao, i n the Mardan District o f Pakistan, and the geological setting of the...(1973)Economic aspects of topaz of Ghundao Hill, Katlang, District Mardan. West Palzistan Industrial Corp., unpublished...porphyries of the Peshawar plain alkaline igneous province, Northwest Himalayas, Palzistan. In F.A. Shams |  | | Report (issue) | | Andesine, oligoclase, nepheline, scapolite (syenites); spinel, rutile, chondrodite, âhornblendeâ, phlogopite...dumortierite, chlorite (schists); pyrope-rich garnet, spinel, phlogopite, omphacitic clinopyroxene, kyanite...Chester, Hampden Co., Massachusetts; the Cortland district, Westchester Co., New York; at Franklin, Sussex...gems from: the Mogok district, Myanmar (Burma). In the Ratnapura district, Sri Lanka. Around Mysore, India...Sorobi, Laghman Province, Afghanistan. At Merkestein, near Longido, and the Morogoro district, Tanzania. From |  | | Journal (article/letter/editorial) | | in stream sediments of a granulite terrain in Sri Lanka â evidence for a mineralized belt Rohana Chandrajith...Geology, UniĂersity 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 Ĺ˝Ganga |
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Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka