 | | Journal (article/letter/editorial) | | COMMUNICATIONS IN THE GEM C. B. DISSANAYAKE AND S. W. 788 BEDS OF SRI LANKA NAWARATNE Department...Peradeniya,Peradeniya,Sri Lanka Even thoughthe occurrenceof gold in Sri Lanka has been mentioned in...confirmedby the officersof the Mineral Surveyin the Sabaragamuwa, centraland western provinces(Ceylon Administration...p. 57), showsthe known occurrences of gold in Sri Lanka. The area under considerationis a very rugged...mountainous regionin the southeastern part of Ratnapura (Fig. 1). Figure 2 showsthe detailedgeology of |  | | 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) | | Geochemistry of Beryllium and Fluorine in the Gem Fields of Sri Lanka M. S. Rupasinghe 1, A. Banerjee 1, j. Pense...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...charnockitic rocks abundant in the main gem bearing areas of Sri Lanka. Fluorine is found in the range of |  | | Journal (article/letter/editorial) | | and Liddicoatitic Tourmalines ANJANABONOINA DISTRICT, MADAGASCAR T he tourmaline database, like that...Madagascar, as the calcium analogue of the well-known gem and specimen species elbaite (Dunn, Appleman, and...those cut across the c-axis, at major mineral and gem shows. Consequently, because of its great collector...highlands of the Vakinankaratra region, Antananarivo Province, near Antsirabe and south of Betafo, near the...perpendicular to the c-axis, is from the Anjanabonoina district, Madagascar. Trinity Minerals specimen, John Veevaert |  | | Journal (issue) | | inclusions or these cannot be seen because the host gem is too opaque. The brownish opal termed hyalite,...KennethScarratt, Kenneth Scarratt, F.G.A. F.G.A. The Gem Gem Testing Testing Laboratory Laboratory of of Great...Laboratory's name that has changed, firstly from 'The Gem Testing Laboratory of the London Chamber of of Commerce...Commerce and Industry' and then to 'The British Gem Testing Laboratory of the London Chamber ofCommerce...The The Laboratory Laboratory is now known as 'The Gem Testing Laboratory of of Great Britain'.. Britain' |  | | 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...topaz, and zircon. Largescale gem mining is confined mainly to the Ratnapura and Elahera areas (Fig. 1)...1). In most local- ities gem minerals are recovered from residual, alluvial, and eluvial depositsthough...common (Dahanayake et al., 1980). The gem-bearing beds in the Ratnapura area are mostly alluvial in origin |  | | Journal (article/letter/editorial) | | element abundance in the sedimentary gem deposits of Sri Lanka M.S. RUPASINGHE and C.B. DISSANAYAKE*...element abundance in the sedimentary gem deposits of Sri Lanka. Lithos, 17: 329-342. This study reports...(rare-earth elements) data from the gem-bearing sediments in Sri Lanka. The REE in these placer deposits...marked similarity with those for charnockites in Sri Lanka as well as for charnockite-granite rocks in other...negative Eu-anomaly. From the general geology of the gem fields and from the REE data it appears that the |  | 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) | | of the main productive and historical sources of gem spinel. Three consistent sets of d18O values were...study shows that it is possible to discriminate gem spinels hosted by marbles from different geographic...oxygen isotopes, geographic origin. INTRODUCTION Gem spinel belongs to the aluminous spinel subgroup A2þB3þ2O4...Pardieu/GIA; (E) E. Gaillou/ENSMP. Badakshan Province in Afghanistan (Spencer 1937). In Roman times...SPINELS IN MARBLE FIG. 2. Location of pink and red gem spinel deposits (large star) and occurrences (small |  | | Journal (article/letter/editorial) | | peculiar vein-dikes of the Grenville Geologic Province, Canada. Gem zircon and associated corundum occur in...aggregates to as much as 7 cm across associated with monazite, uraninite, and a variety of secondary uranium...sheet mica pegmatite mines of the Spruce Pine district, Mitchell and Yancey counties. Relatively productive...centimeters across have been collected at the monazite prospect near Mars Hill. Several zircon mines...titanite (some replaced by anatase), allanite, monazite, xenotime, apatite, stilbite, and epidote. Similar |  | | 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...rich accessory mineral phases such as zircon, monazite, apatite, garnet and rutile in the sediments....Walawe Ganga Basin, Sri Lanka. Introduction More than 90% of the island of Sri Lanka is made up of amphibolite |  | | 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...with flux synthetic ruby overgrowth pg. 243 244 Gem News International Aquamarine with unusually strong |  | | Journal (article/letter/editorial) | | hyperspectral PL maps. Zircon from the Ratnapura district (Sri Lanka, ~520 Ma), was used as reference material...bands is discussed on two examples from Mt. Malosa district, Malawi. A mean weighted U-Pb isotope age of 111...relatively large, gem-quality zircon samples from gem-gravels in Ratnapura, Sri Lanka that have high chemical...higher chemical flexibility than zircon (e.g., monazite-type group minerals as reported by Ruschel et...well-studied reference material from the Ratnapura district (Sri Lanka). The basic principle and underlying |  | | Journal (issue) | | Tribute to Robert M. Shipley, Jr. The Chanthaburi-Trat Gem Field, Thailand Peter C. Keller 197 Gemstones with...Alexandrite Effect E. Giibelin and K. Schmetzer 204 Gem-Quality Grossular Garnets D. Vincent Manson and Carol...Crystal: The Van Pelt Collection John Sinkankcis 221 Gem-Quality Friedelite from the Kalahari Manganese Field...REGULAR FEATURES Gem Trade Lab Notes Editorial Forum Gemological Abstracts Book Reviews Gem News Index to...Liddicoat, Jr. Associate Editor Peter C. Keller Editor, Gem Trade Lab Notes Chuck Fryer Editor, Gemological Abstracts |  | Dushyantha, Nimila, Ilankoon, I. M. Saman K., Ratnayake, N. P., Premasiri, H. M. R., Dharmaratne, P. G. R., Abeysinghe, A. M. K. B., Rohitha, L. P. S., Chandrajith, Rohana, Ratnayake, A. S., Dissanayake, D. M. D. O. K., Batapola, N. M. (2022) Recovery Potential of Rare Earth Elements (REEs) from the Gem Mining Waste of Sri Lanka: A Case Study for Mine Waste Management. Minerals, 12 (11) 1411 doi:10.3390/min12111411 | Journal (article/letter/editorial) | | Rare Earth Elements (REEs) from the Gem Mining Waste of Sri Lanka: A Case Study for Mine Waste Management...Rare Earth Elements (REEs) from the Gem Mining Waste of Sri Lanka: A Case Study for Mine Waste Management...Engineering, University of Moratuwa, Moratuwa 10400, Sri Lanka Department of Applied Earth Sciences, Faculty...Wellassa University, Passaara Road, Badulla 90000, Sri Lanka Discipline of Chemical Engineering, School of... University of Peradeniya, Peradeniya 20400, Sri Lanka Correspondence: nimila.dush@gmail.com (N.D.); |  | | Journal (article/letter/editorial) | | established using a suite of well-characterized Sri Lankan zircon. Band broadening upon increasing corpuscular...Second, we have investigated large, homogeneous, gem-quality zircon samples. These included 13 mildly...radiation-damaged stones from gem gravels in the Ratnapura area, Sri Lanka (U–Pb ages in the range 522–572...concentrations, ages, a-doses and spectroscopic data of the gem samples are listed in Table 2. To identify specific...Lowtemperature photoluminescence-measurements of homogeneous, gem-quality zircon samples were done using a long-distance |  | | Journal (issue) | | Branch: M. P. Gayton, F.G.A. South Yorkshire & District Branch: 1. R. M. Lewis, F.G.A. Examiners: B. W...many others, I owe all such knowledge of gems and gem materials as I possess—apart, in my case, from such...matters more complicated the actual weights used by gem merchants with their balances were numbered 1000...appeared in the early years of the century are The Gem Cutter's Craft by L. Claremont (London, 1906), which...was my standby when I first started work in the Gem Testing Laboratory, but one had to wait until 1940 |  | | Journal (article/letter/editorial) | | to the lamprophyre family. R. H. R. ILMENITE, MONAZITE, AND ZIRCON AND GEMS AND SEMI-PRECIOUS STONES...example, owing to the decreased use of gas mantles monazite is now valuable less for its thorium content than...extent and high grade. From time immemorial the gem gravels of Ceylon have been famous : they seem to produce...for sapphires. From a definite area in the Ratnapura district comes 95 per cent of the output of gems and...pegmatites therein. It is noted that the local methods of gem-cutting are extremely primitive, and that expert |  | | Journal (article/letter/editorial) | | to the lamprophyre family. R. H. R. ILMENITE, MONAZITE, AND ZIRCON AND GEMS AND SEMI-PRECIOUS STONES...example, owing to the decreased use of gas mantles monazite is now valuable less for its thorium content than...extent and high grade. From time immemorial the gem gravels of Ceylon have been famous : they seem to produce...for sapphires. From a definite area in the Ratnapura district comes 95 per cent of the output of gems and...pegmatites therein. It is noted that the local methods of gem-cutting are extremely primitive, and that expert |  | | Book | | Dimensions in the captions refer to the entire gem or mineral; however, in some cases only a portion...A CHANGING PLANET 11 Vanadinite, San Carlos district, Chihuahua, Mexico * 8 x 4 x 2 cm Mineral Species...can be as valuable as the richly colored stones. Gem cutters bring out the inner beauty of gems by creating...trick with light. Facets allow light to enter the gem; once inside, the light bounces off its other angled...Africa and Canada « 2.00 ct and 3.06 ct leaves the gem, similar to what happens when you pass light through |  | | Journal (article/letter/editorial) | | 48109-2104, U.S.A. 2 ABSTRACT A single, zoned, Sri Lankan zircon exhibits a range of microstructures...zones was consistent with results for a suite of Sri Lankan single crystals, suggesting that all of these...undergone minimal annealing (e.g., lunar zircon), the Sri Lankan zircon crystals have accumulated less damage...annealing. To estimate the extent of annealing in Sri Lankan samples, an equivalent damage dose (i.e.,...unannealed zircon. The dose vs. damage relationship in Sri Lankan zircon crystals (560 Ma) is equivalent to |  | Voudouris, Panagiotis, Mavrogonatos, Constantinos, Graham, Ian, Giuliani, Gaston, Melfos, Vasilios, Karampelas, Stefanos, Karantoni, Vilelmini, Wang, Kandy, Tarantola, Alexandre, Zaw, Khin, Meffre, Sebastien, Klemme, Stephan, Berndt, Jasper, Heidrich, Stefanie, Zaccarini, Federica, Fallick, Anthony, Tsortanidis, Maria, Lampridis, Andreas (2019) Gem Corundum Deposits of Greece: Geology, Mineralogy and Genesis. Minerals, 9 (1) 49 doi:10.3390/min9010049 | Journal (article/letter/editorial) | | minerals Article Gem Corundum Deposits of Greece: Geology, Mineralogy and Genesis Panagiotis Voudouris... Abstract: Greece contains several gem corundum deposits set within diverse geological settings...–Ti4+ pairs produce blue. Distinction of primary gem quality-rubies and sapphires in magmatic and metamorphic...southern Madagascar, East Africa, South India and Sri Lanka; those related to the Himalayan orogeny mostly...southeast Asia. The use of trace element content of gem corundums, in association with their oxygen isotopic |  | | Journal (issue) | | FEATURE ARTICLES 2 A New Method for Determining Gem Tourmaline Species by LA-ICP-MS Ziyin Sun, Aaron...a simplified but comprehensive classification of gem tourmaline species based on quantitative measurement...Zircon Inclusions in Sapphires from Ratnapura and Balangoda (Sri Lanka) and Implications for Geographic...sapphire • Quarterly Crystal: Orpiment in barite 118 Gem News International Tucson 2019 • Boulder opal mining...Responsibly sourced gemstones • The Chinese and Japanese gem markets • Unusual and vibrant gems • Jeff Hapeman |  | Nasdala, Lutz, Reiners, Peter W., Garver, John I., Kennedy, Allen K., Stern, Richard A., Balan, Etienne, Wirth, Richard (2004) Incomplete retention of radiation damage in zircon from Sri Lanka. American Mineralogist, 89 (1) 219-231 doi:10.2138/am-2004-0126 | Journal (article/letter/editorial) | | retention of radiation damage in zircon from Sri Lanka LUTZ NASDALA,1,* PETER W. REINERS,2 JOHN I. GARVER...placers in the Highland/Southwestern Complex, Sri Lanka, were subjected to a comprehensive study of their...compared to unannealed zircon from other localities, Sri Lanka zircon is about half as metamict as would correspond...We suggest to estimate “effective α-doses” for Sri Lanka zircon by multiplying total α-fluences, which...literature data as well, because all gem-zircon samples from Sri Lanka (this work and previous studies) seem |  | | Journal (issue) | | No. 8 / 2019 COLUMNS What’s New 679 ABCD Pro-1 Gem Testing Set | D-Imaging Device | Raman Spectroscopy...| Jewelry Journey Podcasts | Gemewizard Gem Color Academy Gem Notes Amethyst from Zimbabwe | Apatite...Fuchsite Phantom Inclusions | Tourmaline from Sri Lanka with Transient Tenebrescence? | Diving for Natural...710–725 of this issue) and therefore does not have a Sri Lankan origin as commonly described for Roman sapphires...Trapiche Ruby from Khoan Thong, Luc Yen Mining District, Northern Vietnam 726 By Isabella Pignatelli |  | | Journal (issue) | | Gemesis CVD synthetic diamond New sapphires from Sri Lanka Cultured pearls from Micronesia VOLUME 48 NO...reputation? It’s the most reliable, authentic, dependable gem institute in the world. People know that, especially...Sapphires from Thammannawa, Kataragama Area, Sri Lanka Pannipitiye G. R. Dharmaratne, H. M. Ranjith Premasiri...sapphires, the object of a recent gem rush in southeastern Sri Lanka, possess good transparency and a...research efforts have led to dramatic progress in gem-quality CVD synthesis and post-growth treatment. |
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