 | | Journal (issue) | | (7) 2.14 ct blue sapphire, (8) 23.18 ct blue spinel, (9) 4.82 ct purple sapphire, (10) 5.32 ct Paraíba...1.15 ct purplepink sapphire, (16) 5.54 ct spessartine, (17) 8.04 ct orange sapphire, and (18) 3.48 ct...(Brazil and Colombia), central and southern Asia (Sri Lanka, India, Afghanistan, Pakistan, Russia, and China)... alexandrite and other chrysoberyls, ruby and sapphire, diamond, garnet, jade [both jadeite and nephrite]...come from a number of sources, but predominantly Sri Lanka. Accented with smaller diamonds, the 129 gem corundums |  | | 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...include the colored gemstones ruby, emerald, and sapphire. This paved the way for Greenland Ruby to join...Greenland Ruby’s mine produces both ruby and pink sapphire. “We’re delighted to begin the process of becoming |  | | Journal (issue) | | April2000 2000 April ' SriLankan Lankan 'f^ ^ < Sri gemdeposits deposits ; . gem LW NwwTN » ., GEPOL...deposits in in the the Okkampitiya Okkampitiya gem gem field, field, Sri Sri Lanka Lanka 1 1 2 V. V.Mathavan...University University ofofPeradeniya, Peradeniya,Sri SriLanka Lanka 2.2.Institutfur Institut für Geowissenschaften...discovered recently recently in inthe theOkkampitiya Okkampitiya gem gem field field which which isissituated...situated in in south-eastern south-eastern Sri Sri Lanka. Lanka. These These are are (1) (1) the the gem-bearing |  | | Conference Proceedings | | Henry A. Hänni, Switzerland; Mr. Gamini Zoysa, Sri Lanka; Dr. Karl Schmetzer, Germany; Prof. Dr. Emmanuel...(1979), Kashiko-Jima, Japan (1981), Beruwela, Sri Lanka (1983); Sydney, Australia (1985); Rio de Janeiro...Norway, Russia, Singapore, South Africa, Spain, Sri Lanka, Switzerland, Sweden, Tanzania, Thailand, U.S...Chen Yanyu, Arūnas Kleišmantas: Spinels from Sri-Lanka. 11 36 th IGC 2019 – Nantes, France Co nference...Chanmuang N. , E. Gamini Zoysa : Ekanite from Sri-Lanka : what can we learn from a radioactive gemstone |  | | Journal (issue) | | iridescent chatoyancy Grey orthoclase moonstone from Sri Lanka has a unique combination of a cat's-eye and a...Brazil and another colourless of 12.20 ct from Sri Lanka, but this specimen is considerably larger. Two...Moonstone with a star and cat'seye combination from Sri Lanka Sunstone cat's-eye from Russia A stone described...purchased in Germany and probably comes from Sri Lanka, where a similar one was offered to the author...located 31.5 km south of the city of Wroclaw in the province of Dolny Slask (Lower southwest Poland (Figure |  | | Journal (issue) | | from Guyana Surface Features of Ekanite from Sri Lanka A Study of Gems from Napoleon III’s Crown A New...EDITORIAL 137 Diamonds from Guyana, Ekanite from Sri Lanka, a New Amber Source in Vietnam, and More... Duncan...characteristics of ekanite from secondary deposits in Sri Lanka. 168 A Gemological and Spectroscopic Study with...necklaces • A star and cat’s-eye color-change sapphire • Bicolor cuprian tourmaline p. 219 226 G&G...0016-626X Diamonds from Guyana, Ekanite from Sri Lanka, a New Amber Source in Vietnam, and More... Welcome |  | | Journal (issue) | | Argyle, courtesy of Rio Tinto; (4) an 11.16 ct sapphire from Madagascar, GIA Collection no. 31618; (5)...fields. Likewise, beryllium diffusion of ruby and sapphire brought together geologists, gemologists, and...instrumentation such as LA-ICPMS—once primarily the province of academia—became a fixture in many gemological...exports from Myanmar disrupted supply channels for sapphire and ruby. And the proliferation of new sales avenues...were combined under the jurisdiction of the U.S. District Court of New Jersey 168 PRODUCTION AND MARKETS |  | | 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...exploration. INTRODUCTION The gem minerals of Sri Lanka have attracted the attention of mineralogists |  | | 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...in natural stones such a s ruby. emerald. and sapphire. selling points of gemstones and how to separate...Flux Ruby Synthetic Flame Corundum Natural Blue Sapphire Opal and Synthetic Opal Diamond Simulants Green |  | | Journal (issue) | | bubble in opal • Iridescent healed fissures in sapphire • Quarterly Crystal: Topaz with phlogopite 70...Paula Crevoshay • Prida Tiasuwan • Rock Creek sapphire update • Peter Ngumbi • Somewhere in the Rainbow...applied to turquoise sourced from China’s Hubei Province. Next, Che Shen and coauthors provide a mathematical...58 Pardieu V., Rakotosaona N. (2012) Ruby and sapphire rush near Didy, Madagascar. GIA Research News...source of commercial turquoise in China’s Hubei Province, where mass production has been ongoing for several |  | | 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 (issue) | | Scapolite with Unusual Properties from Embilipitiya, Sri Lanka Pieter C. Zwaan Some Tanzanite Imitations Lore...well-representedin this issue: Unusual gem materials from Sri Lanlza (a country Bob visited several years ago)...world gem market as the Ouro Preto Imperial topaz district comprises two major active mining sites-Cap50...operation is the Cap50 mine, in the Rodrigo Silva district. Specimens and information about that mine were...occurrence) on the west, both in the Ouro Preto district (again, see figure 2). Pires et al. (1983)identified |  | | Journal (issue) | | NEWTECHNIQUES Sapphires from Changle in Shandong Province, China fingfeng Guo, Fuquan Wang, and Gerry Yukoumelos...predon~inantlyindustrial production in nearby Zaire (East Kasai province), that in Angola is reportedly 70% gem quality...Shield near Arkhangelsk (on the White Sea, in the province of Oblast, near the border with Finland) gives...subsequently-for example, in clusters in the State Line district of Colorado and Wyoming, in the Lake Ellen group...portions of which contain the largest geologic province of lamproitic roclzs in the world (Peterson, 1992) |  | | Journal (issue) | | TECHNIQUES 159 Inclusions in Taaffeites from Sri Lanka , Mahinda Gunawardene 163 ~ a ~ n e tProperties...NEW TECHNIQUES INCLUSIONS IN TAAFFEITES FROM SRI LANKA By M a h j n d a G u n a w a r d e n e This article...mineralogical study of inclusions i n taaffeites from Sri Lanka, with photomicrographs of some of the most characteristic...genesis of taaffeite is discussed. Taaffeitesirom Sri Lanka, China, the USSR, Australia, and even Burma have...reported is believed to be of Ceylon (now called Sri Lanka] origin (Anderson et al., 1951; Anderson, 1968) |  | | Book | | Blue = sapphire All other colours are termed sapphire with the colour prefix (e.g. yellow sapphire) Phenomena:...o-ray = purplish red; e-ray = orangy red Blue sapphire: o-ray = violetish blue; e-ray = greenish blue...nm, and general absorption of the violet Blue sapphire (Fe + Ti) = Three lines at 451.5 (strongest),...to strong red (long wave and short wave) Blue sapphire = various reactions (see text) Natural inclusions:... Major sources: Burma, Thailand, Cambodia, Sri Lanka, India, Australia, Kenya, Tanzania, Montana and |  | | 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...known deposits are located in the Uva region, in the Ratnapura district and in the Tissamaharma area (Dunn...(1977) classified the brown tourmalines from Sri Lanka as uvite and dravite: Results For the analyses |  | | Book | | by Surface Waters: 1 5 The Gem Gravels of Sri Lanka 2. Gemstones Formed from Surface Water: 19 ...by surlace waters. The classic gem gravels of Sri Lanka are used as an example of one of these secondary...examined the chapter on alluvial deposits and Sri Lanka. Dr. Ralph Segnit, Chairman of the Committee for...it was most needed. Spectacular photographs of Sri Lanka were provided by Peter Horree of the Netherlands...Concentrated by Surface Waters: The Gem Gravels of Sri Lanka Chapter 2. Gemstones Formed from Surface Water: | | | Book | | by Surface Waters: 1 5 The Gem Gravels of Sri Lanka 2. Gemstones Formed from Surface Water: 19 ...by surlace waters. The classic gem gravels of Sri Lanka are used as an example of one of these secondary...examined the chapter on alluvial deposits and Sri Lanka. Dr. Ralph Segnit, Chairman of the Committee for...it was most needed. Spectacular photographs of Sri Lanka were provided by Peter Horree of the Netherlands...Concentrated by Surface Waters: The Gem Gravels of Sri Lanka Chapter 2. Gemstones Formed from Surface Water: |  | | Journal (issue) | | North-West Branch: S. Hill, F.G.A. South Yurkshire & District Branch: J. L Reynolds, F.G.A. Examiners: E. A... 203 J. Gemm., 1986, 20, 4 Glass fillings in sapphire K. Scarratt, F.G.A.* R.R. Harding, B.Sc., D.Phil...glass containing bubbles near culet of 1.28 ct sapphire. The largest bubble is 0.5 mm in diameter. Abstract...analyses of afillingat the surface of a faceted sapphire indicate that it is an aluminosilicate glass....discussed. It is concluded that the glass in this sapphire is man-made. Introduction Rubies and sapphires |  | | Journal (issue) | | occur in the John Saul ruby mine, Taita-Taveta District, Kenya (Simonet, 2000) which is located just north...change to green by heating of red corundum from Sri Lanka, and reversion to red by cooling. Thermochromy...colouring Easter eggs. I b A certain orange-yellow sapphire placed on top of a green UE tourmaline turns deep...with a Chelsea filter. Placing the orange-yellow sapphire on top of a green UE tourmaline also results in...of four green tourmalines from the Taita-Taveta District, Kenya. For the present study, the contents of |  | | Journal (issue) | | 536 Geographic Origin Determination of Blue Sapphire Aaron C. Palke, Sudarat Saeseaw, Nathan D. Renfro...Shane F. McClure In some cases, the value of a sapphire depends strongly on its geographic origin. This...details the origin data GIA has collected for blue sapphire and describes its methodology for using the data...from left: a 64.45 mm Sri Lankan sapphire crystal, a 24.34 ct Sri Lankan blue sapphire, two cuprian tourmalines...mm pink-purple Sri Lankan sapphire crystal, a 10.90 ct Burmese ruby, and an 11.11 ct Sri Lankan alexandrite |  | | Book | | - by richard w. hughes I - ,=: CJ? UBY & SAPPHIRE is a journey into one of mankind's most fascinating...than yawns is always a scarce item. But Ruby & Sapphire is just such a book-a rare combination of face...fun, the pertinent and che peculiar. Open Ruby & Sapphire and you seep into a secret world where, with each...amazing and colorful tales within. Bur Ruby & Sapphire is also 1nuch more. T he product of over 15 years...a virtual encyclopedia of the subject. Ruby & Sapphire highlights: • Side-by-side photos illustrate color |  | | Journal (issue) | | in Colorless, Yellow, and Blue Sapphires from Sri Lanka Kcirl Scl~metzerand Olaf Medenbach REGULAR FEATURES...Banjarmasin-Martapura area of southeastern Kalimantan (the province of Kalimantan Selatan). The gemological characteristics...map shows the two major areas (left the Landak district of western Kali= man tan, below = the Bmjarn~asin-Maitapura...000 guilders worth of diamonds from the Landak district in what is now western Kalimantan. The 367-ct...Banjarmasin, the capital city of Kalimantan Selatan province. In GEMS & GEMOLOGY Summer 1988 this area |  | | Journal (issue) | | (including alexandrite), corundum (ruby, blue sapphire and synthetic colour-change corundum), diamond...gia.edu/gia-news-researchnigerian-source-blue-sapphire. Goldsmiths’ Review 2013/2014 In July 2014, The...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 |  | | Journal (issue) | | Volume 36 / No. 8 / 2019 Sapphire Intaglio from Pompeii Chinese Synthetic Diamonds Trapiche Rubies...Fuchsite Phantom Inclusions | Tourmaline from Sri Lanka with Transient Tenebrescence? | Diving for Natural...basaltic-type sapphire (see article on pp. 710–725 of this issue) and therefore does not have a Sri Lankan origin...ash. ARTICLES Gemmological Analysis of a Roman Sapphire Intaglio and Its Possible Origin 710 By Michael...Trapiche Ruby from Khoan Thong, Luc Yen Mining District, Northern Vietnam 726 By Isabella Pignatelli |
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Okkampitiya, Monaragala District, Uva Province, Sri Lanka