 | | Journal (issue) | | last ten years, Vietnam has become a significant ruby and sapphire-producing country in south-east Asia...the country, respectively In this paper, the term ruby is used for Cr-bearing corundum including pink and...same time, thousands of local peasants searched for ruby and sapphire and in 1991, alluvial sapphires related...1983, ruby was discovered by a geologist during field mapping in the An Phu area (Luc Yen district), 270...Nuoc Ngap, Hin Om, Khau 174 The Quy Chau mining district is located about 120 km north-west of the city |  | | Journal (issue) | | diamonds shown in Figure 4. The one phonon diamond region has been expanded in the column on the right to...produce a transmission window in the yellow-green region of the visible spectrum resulting in a face-up...Montana, U.S.A., Ilakaka, Madagascar, and Songea, Tanzania. Keywords: absorption spectroscopy, beryllium...sapphires from Sri Lanka, Montana, Ilakaka and Songea Part III: A microscopy-based screening system;...treated sapphires, especially samples from Songea, Tanzania, and Ilakaka, Madagascar, contained elevated |  | | Journal (article/letter/editorial) | | acquired LIBS spectra from 569 rough sapphire and ruby specimens from 21 localities in 11 countries. The...(sapphire) and 96.0% (ruby) for country of origin and 97.9% (sapphire) and 95.4% (ruby) for deposit of origin...measure with a high level of success. Keywords: Ruby, sapphire, provenance, laser-induced breakdown spectroscopy...laser-induced breakdown spectroscopy (LIBS) from 569 ruby and sapphire specimens from 21 localities in 11...models that sequentially compares spectra from one region to all other regions. This method has proven successful |  | 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) | | karsts. The oxygen isotopic ratios (18O/16O) of ruby and sapphire from primary deposits are a good indicator...deposits have a wide spread between â0.3 and 16.5â°. The ruby and sapphire found in placers linked to alkali basalt...have consistent δ18O values between 3.5 and 6.9â°. Ruby from the placers of Vatomandry and Andilamena has...placer deposits from Sri Lanka, Madagascar, and Tanzania have a large variety of colored sapphires and...different origin: mafic and ultramafic rocks for ruby, desilicated pegmatites for blue sapphire, syenite |  | | Book | | GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published by Struik...resources 12 Burundi 13 Kenya 14 Rwanda 16 Tanzania 17 Uganda 20 Gemological properties 21 A to...through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa, Kenya and Tanzania, with...starting in what was then Tanganyika ( now mainland Tanzania) and then progressing to Kenya - I am proud to...countries are among the finest in the world. The region and its gems are particularly dear to my family |  | | Journal (issue) | | _____________ pg. 130 84 Beryllium Diffusion of Ruby and Sapphire John L. Emmett, Kenneth Scarratt,...displaying asterism ⢠Catâs-eye scapolite from Tanzania ⢠Miscellany from Tucson ⢠Cubic zirconia briolettes...reserved. ISSN 0016-626X BERYLLIUM DIFFUSION OF RUBY AND SAPPHIRE John L. Emmett, Kenneth Scarratt, Shane...corundum colors, including yellow and blue as well as ruby, have been produced or altered by this treatment...attractive color (figure 1). 84 BERYLLIUM DIFFUSION OF RUBY AND SAPPHIRE Our initial interpretationâthat this |  | | Journal (article/letter/editorial) | | Metamorphic Terrane of the Mozambique Belt in Tanzania E. MALISA and S. MUHONGO Department of Geology...of Dares Salaam, P.O. Box 35052, Dares Salaam (Tanzania) Abstract Malisa, E. and Muhongo, S., 1990. Tectonic...metamorphic terrane of the Mozambique Belt in Tanzania. Precambrian Res., 46: 167-176. The Proterozoic...lithostratigraphic units of the Mozambique Belt in Tanzania constitute the multiply deformed and polymetamorphic...mineralizations of these metamorphic terranes in Tanzania are formed either by metamorphic-hydrothermal |  | | Journal (article/letter/editorial) | | spectroscope would reveal whether the âBlack Princeâs rubyâ (a 170 carat red stone set in the front of the...imperial state crown of the United Kingdom) is a ruby or a red spinel (it actually is a spinel). For a...rutile inclusions are characteristic of the Songea (Tanzania) deposit. Crystal Growth as Revealed by Color...Be-diffusion treatment applied to a sapphire from Songea (Tanzania); yellowish and orangey zones of color were...around the stubby rutile inclusions typical of Songea is indicative of both heat treatment and the geographic |  | | Journal (issue) | | cultured pearl ⢠Gastropod shell in a shell blister ⢠Ruby with synthetic overgrowth ⢠Exceptionally large...crystals in sapphire ⢠Solid inclusions in flame-fusion ruby ⢠Quarterly Crystal: Columbite(?) in beryl p. 89...study of fancy sapphire from Greenland ⢠Liberian ruby ⢠Forsterite in purple Tanzanian spinel ⢠Grayish...discoveries from around the world and a new source of ruby from Liberia. Finally, test your gemological knowledge...finds of ruby. Secondary Montana sapphire shares some similarities with those from Umba and Songea in Tanzania |  | | Journal (issue) | | 322 Rubies and Sapphires from Winza, Central Tanzania Dietmar Schwarz, Vincent Pardieu, John M. Saul...âD-TO-Zâ DIAMONDS diamonds from the Cape of Good Hope region, and âJagerâ for colorless diamonds with strong...of color in a diamond. In the New York jewelry district on Maiden Lane, neighboring buildings were painted...the blue region of the spectrum, as it is the absorption area of wavelengths in this region that allows...the 6-watt lamps used in the past. Here, the UV region shows good agreement between the three lamps. Note |  | Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 | Journal (article/letter/editorial) | | minerals Review Ruby Deposits: A Review and Geological Classification Gaston Giuliani 1, *, Lee A. Groat...is not uncommon on Earth but the gem varieties of ruby and sapphire are relatively rare. Gem corundum deposits...classification scheme for ruby deposits is described in the present paper. Ruby forms in mafic or felsic...geological environments are favorable for the presence of ruby: (1) amphibolite to medium pressure granulite facies...volcanism in continental rifting environments. Primary ruby deposits formed from the Archean (2.71 Ga) in Greenland |  | | Journal (issue) | | ct emerald, (13) 1.99 ct red beryl, (14) 0.72 ct ruby, (15) 1.15 ct purplepink sapphire, (16) 5.54 ct...Asia (Myanmar, Thailand, and Vietnam), Africa (Tanzania, Kenya, Zimbabwe, Nigeria, and Namibia, as well...among both jewelers and consumers. These included ruby from Mong Hsu, Myanmar (Burma); blue and pink sapphires...a wide variety of colored stones from southern Tanzania; spessartine garnet from Nigeria and Namibia;...other beryls, alexandrite and other chrysoberyls, ruby and sapphire, diamond, garnet, jade [both jadeite |  | | Journal (issue) | | alluvial sapphires from Russiaâs Jewish Autonomous District. 266 A New Deposit of Gem-Quality Grandidierite...in Mexico ⢠Colored gemstone mining update from Tanzania ⢠Purple pyrope-almandine garnet from Mozambique...corundum-bearing rocks at Sutara, in the Jewish Autonomous Region of the Russian Far East. The authors postulate...741.2 nm and related absorption in the visible region; the latter imparts a green to blue color. An interesting...with absorption, which extends into the visible region and becomes less intense at shorter wavelengths |  | | Journal (issue) | | kilobars and temperatures of 1400°C â1700°C. In this region of the diamond stability field (see figure 2),...color-change garnets have been known from Sri Lanka and Tanzania, interest in this phenomenal material has grown...with the discovery of new deposits near Tunduru (Tanzania) and especially Madagascar. In particular, the...Athiliwewa, in Sri Lanka; or Umba and Tunduru, in Tanzania (see references given above as well as Koivula...range, respectively. absorption band in the yellow region, an absorption minimum always is found in the blue-green |  | | Journal (issue) | | .......................................... 47 Tanzania.................................................Takada, Japan Dong Keuk Kim, Korea Bhadresh Pandit, Tanzania Janet Ann Russell, Thailand Surasit Sriorathaikul...Ambassador, Pakistan; Eric Saul, ICA Ambassador, Tanzania; Thomas R. Yager; Dr. Dietmar Schwarz, Switzerland;... from the Panshir Valley, medium to low quality ruby and pink sapphires, from Jeg Dalek near Soroby,...minister of mineral resources who said he believed the region needed new areas to prospect, as there have been |  | | Journal (issue) | | VOLUME 45 NO. 4 Ruby-Sapphire Review Nanocut Plasma-Etched Diamonds Chrysoprase from Tanzania Demantoid from...__________________ 236 Carat Points 260 pg. 251 Ruby and Sapphire Production and Distribution: A Quarter...Chrysoprase and Prase Opal from Haneti, Central Tanzania James E. Shigley, Brendan M. Laurs, and Nathan...the Kagem mine, Zambia ⢠Yellow grossular from Tanzania ⢠An unusual blister pearl ⢠Myanmar report â˘...Notari. LETTERS GEMS & GEMOLOGY WINTER 2009 235 RUBY AND SAPPHIRE PRODUCTION AND DISTRIBUTION: A QUARTER |  | | Journal (issue) | | courtesy of Aurora Gems; (6) a 9.15 ct ruby from Winza, Tanzania, courtesy of Hakimi & Sons; (7) a 14.80...from other fields. Likewise, beryllium diffusion of ruby and sapphire brought together geologists, gemologists...Myanmar disrupted supply channels for sapphire and ruby. And the proliferation of new sales avenues, through...were combined under the jurisdiction of the U.S. District Court of New Jersey 168 PRODUCTION AND MARKETS...Africa, and its interest in the Williamson mine of Tanzania. Soon after the Cullinan deal went though (July |  | | Book (edition) | | Ratanakiri Zircon 204 Rhodolite 210 Rubellite 216 Ruby 224 Russian Diopside 232 Spessartite 238 Tanzanite...in nature that may be eye-visible, for example Ruby. ¢ Type III: These gems typically grow with many...value in the marketplace and Diamond, vice versa. Ruby and Sapphire. When other Beauty, marketing ...colour centres), Sapphires would be colourless. Ruby, the âking ofgemsâ all Most things get their colour...Pyrope Rhodonite Rose de France Amethyst Ruby Star Ruby oO mm. Rose Quartz Rubellite te, Pezzottaite |  | | Journal (issue) | | determination. 580 Geographic Origin Determination of Ruby Aaron C. Palke, Sudarat Saeseaw, Nathan D. Renfro...Renfro, Ziyin Sun, and Shane F. McClure The world ruby market has undergone dramatic change in recent years...years, especially with the development of ruby mining in Mozambique. This contribution outlines GIAâs methods...criteria for establishing the geographic origin of ruby. p. 637 614 Geographic Origin Determination of...Sri Lankan sapphire crystal, a 10.90 ct Burmese ruby, and an 11.11 ct Sri Lankan alexandrite. Courtesy |  | 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) | | plumasite, 20.5â° for sapphire in marble and 1â° for ruby in mafics. The fluid inclusions study evidenced...potential gemstones. Keywords: corundum megacrysts; ruby; sapphire; plumasite; metamorphic-metasomatic origin;...volcanism (65â1 Ma) [2,4â10]. Magmatic and metamorphic ruby and sapphire deposits related to the Pan-African...mafic-ultramafic complexes especially that of Winza in Tanzania. In addition to the above localities, corundum...is rare for blue sapphire and relatively rare for ruby (S. Karampelas, pers. communication). Thirty-five |  | | Book | | Mineralogy and Geochemistry of Ruby Edited by Frederick Lin Sutherland and Khin Zaw Printed Edition... Mineralogy and Geochemistry of Ruby Mineralogy and Geochemistry of Ruby Editors Frederick Lin Sutherland...the Special Issue âMineralogy and Geochemistry of Rubyâ published online in the open access journal Minerals... vii Preface to âMineralogy and Geochemistry of Rubyâ . . . . . . . . . . . . . . . . . . . . . . . ...for Special Issue âMineralogy and Geochemistry of Rubyâ Reprinted from: Minerals 2020, 10, 888, doi:10 |  | | Journal (issue) | | eventually craze, the material from the Wollo Province region is considerably more stable. Francesco Mazzero...descriptive visual tour of his travels into the mining district. Noting that there was literally tons of gem material... Most notably, the newer deposits in the Wollo region are testing out to be much more durable than those...treatments is logical as all of the opal from this region is termed hydrophane. Hydrophane has the ability...as well as a controlling stake in a prospective ruby deposit in Mozambique. In Madagascar, Gemfields |  | | Journal (issue) | | indicated that neither cement absorbed in this region of the spectrum. Luminescence. Four of the 23 core...corre- GEMS & GEMOLOGY Winter 1997 sponds to the region of absorption from 400 to 425 nm seen with a hand...moissanite is much less transparent in the ultraviolet region than nearcolorless diamond is. For example, it...moissanite has no sharp bands, but does show a region of intense absorption beginning at about 425 nm...and extending into the ultraviolet. It is this region of absorption, absent in the spectrum of diamond |  | | Journal (issue) | | networks observed in quartzes from the Ratnapura District, Sri Lanka, are explained by the presence of up...deposits of the Sissersk District and the Bobrovka River, both of the central Ural region of Russia (Phillips...is located in the geologically classic Assynt district of central Sutherland, about 77 km northwest of...Awe. Geologically, the oldest bedrocks in the district comprise Precambrian Lewisian gneiss to the west...Phemister's Geological Excursion Guide to the Assyn District of Sutherland. Edinburgh Geological Society, Edinburgh |  | | Book (edition) | | Settlement. 177 15 AGRICULTURE AND LAND TENURE IN TANZANIA by A. HAMERSLEY, m.b.e., b.sc.(agric.) Agriculturalist...Conservator of Forests. 209 18 FORESTRY IN TANZANIA by G. J. KILEO, b.sc. Director of Forestry, Ministry...rocks of the Mozambique Belt. 4a Olduvai Gorge, Tanzania. Pleistocene lake beds and Lemagrut Mountain,...with Pinus radiata in hill country near Mbeya, Tanzania. 6b Log of mahogany, Khaya anthotheca, Budongo...Dombeya rotundifolia in Combretum savannah, Thika District, Kenya. 8b Woodland. Typical miombo (Isoberlinia-Brachystegia) |
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