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| the Kagem mine, the largest emerald mine in the world, in the Kafubu district, Copperbelt Province, Zambia...Zambia. This mine, which has been producing exceptional gem rough since the 1970s, has recently been the...green gemmy emerald crystals in white quartz matrix. Emerald was first discovered in the Kafubu area by the... Only small quantities of relatively mediocre emerald rough were produced from the 96*2: 405...9(3: Figure 1. A recent view of part of the Kagem mine showing subvertical pegmatite dike swarms in |
 | Ren, Junping, Wang, Jie, Zuo, Libo, Liu, Xiaoyang, Dai, Chaocheng, Xu, Kangkang, Li, Guozhan, Geng, Jianzhen, Xiao, Zhibin, Sun, Kai, He, Fuqing, Gu, ALei (2017) Zircon U–Pb and biotite 40Ar/39Ar geochronology from the Anzan emerald deposit in Zambia. Ore Geology Reviews, 91. 612-619 doi:10.1016/j.oregeorev.2017.08.034 | Journal (article/letter/editorial) |
| and biotite deposit in Zambia 40 Ar/39Ar geochronology from the Anzan emerald ⁎ Junping Rena, , Jie...Biotite 40Ar–39Ar age Anzan emerald deposit Zambia The Kafubu Emerald Area in Zambia is an important producer...rock and emerald-hosting biotite chlorite schist from the Anzan emerald deposit in the Kafubu area, Zambia...chronology measurements of the country rock and emerald-hosting rock which belong to Muva Supergroup, yielding...redefined the age of Muva Supergroup in the Copperbelt Province in Zambia to be older than or equal to 1966 ± |
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| 2 cm high, Wessels mine, Hotazel, Kalahari Manganese Field, Northern Cape Province, South Africa; Becky...cm high, N’Chwaning II mine, Kalahari Manganese Field, Northern Cape Province, South Africa; Patrick...3. Fluorite with quartz, 9.8 cm high, Riemvasmaak, Kakamas, Northern Cape Province, South Africa; Eric...cm wide, N’Chwaning II mine, Kalahari Manganese Field, Northern Cape Province, South Africa; Alex Schauss...wide, Kalahari Manganese Field, Northern Cape Province, South Africa; Marshall Sussman specimen. Figure |
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| Gemological Characteristics of Emeralds from Kamakanga, Zambia Yi Zhang and Xiao-Yan Yu * School of Gemology,...Currently, Zambia is one of the world’s major emerald-producing countries. In this study, emerald samples...samples from Kamakanga, Zambia, were systematically analyzed by standard gemological tests, microscopic observation...Gemological Characteristics of Emeralds from Kamakanga, Zambia. Minerals 2023, 13, 341. https://doi.org/10.3390/...creativecommons.org/licenses/by/ 4.0/). 1. Introduction Emerald is a variety of beryl whose ideal formula is Be3 |
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| consistent with a sedimentary source origin. Type IA emerald REE patterns have upturns in the heavy REE (La/YbCC...occurring in Archaean host rocks. Modeling of type IA emerald compositions indicates that they form from magmatic...crustal protoliths. This geochemical signature links emerald formation with continental suture zones. Diamonds...indicating that plate tectonic processes have led to emerald deposit formation since at least the Archaean....that is responsible for the vivid green color of emerald [2]. Emeralds are scarce commodities requiring |
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| SPECIAL ISSUE December 2015 WORLD EMERALD UPDATE Highlights of Bogota Symposium Colombia opened its...world’s leading emerald experts from October 13-15. The First International Emerald Symposium was a huge...around the world taking part. More than 42 global emerald specialists from governments, labs and private...Fedesmeraldas, the Colombian Emerald Federation, and supported by all the country’s emerald-related bodies and...challenges and opportunities faced by the world’s emerald industry, including resource management, manufacturing |
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| natural crystal formations of emeralds. Important emerald gemstones and jewelry can be found in every gem...same cannot be said about exceptional natural emerald specimens. We estimate that there are less than...having two-thirds of the world’s finest known emerald specimens cannot be overstated. This has never...invites the viewer to experience the wonder that is emerald. 3 The Legend of Fura & Tena The Muzo God...emeralds. 5 Emerald on Calcite Coscuez Mine, Muzo Municipality, Vasquez-Yacopí Mining Dist., Boyacá |
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| Special Emerald 2018 – Issue 40 All About Colored Gemstones World Emerald Update Highlights of the...the Second World Emerald Symposium, Bogotá International Gemstone Association AColored Publication of the...Issue 40 ׀InColor 1 2 InColor ׀Special Emerald 2018 InColorMagazine.com; Gemstone.org International... Contents In Side 5 Special World Emerald Update Editor’s Note World Emerald Challenge: Origins and Appellation...Appellation 16 The Second World Emerald Symposium in Colombia The Second World Emerald Symposium Focuses on Responsible |
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| since 1969 since 1969 SEE OUR EMERALD “QUALITY CUT” SEE OUR EMERALD PROCESS PRESENTATION “QUALITY...Industry Background image: Miners at the Pala Chief Mine, San Diego Country, California, circa 1903. On the...They are Found zite (201 cts) is from the Oceanview Mine in Southern California; the 0.72-ct benitoite (left...Century-Old Legacy blue) is from the Dallas Gem Mine area, San America’s Royal Gems – Montana and Yogo... State of Maine phires is from the Gem Mountain Mine, GranTantalizing Turquoise ite Country, Montana |
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| Delays Sale of Sapphires Zambia’s Government Cuts Mining Royalties Archaeological Dig Uncovers 2,000-Year-Old...Output From Montepuez Ruby Mine ICA 2015 Congress Provides Food For Thought Mining 18 26 58 In Search of...of Emeralds From the Musakashi Area of Zambia ICA Mine Tour in Sri Lanka – In Search of Sapphire and...Diamonds Cover Feature 36 True North Gems Greenland Mining - The Final Lap Trends and Jewelry 52 Sri Lanka’s...Capricorn Delays Sale of Sapphires From Australia Mine R potential Sightholders and trade buyers, existing |
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| FEATURE ARTICLES 464 Geology of Corundum and Emerald Gem Deposits: A Review Gaston Giuliani and Lee...of the geology and genesis of gem corundum and emerald deposits. p. 569 512 A Review of Analytical...years, especially with the development of ruby mining in Mozambique. This contribution outlines GIA’s... 637 614 Geographic Origin Determination of Emerald Sudarat Saeseaw, Nathan D. Renfro, Aaron C. Palke...Caplan. The back cover shows emeralds from the Chivor mine in Colombia (3.90 ct faceted stone and 2.35 cm crystal) |
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| SUMMER 2013 ISSUE 23 THE EMERALD CZAR IS GONE THE END OF A MYTH, START OF A NEW ERA Blue Sapphires... SUMMER 2013 ISSUE 23 SUMMER 2013 ISSUE 23 AN EMERALD CZAR IS GONE THE END OF A MYTH, START OF A NEW...PM Left: The late ‘Emerald Czar’ Victor Carranza at the famous Muzo emerald mining area in Colombia. Photo...Revista Semana. Inset: Thousands of artisanal emerald diggers, also called ‘guaqueros,’ in Muzo in 1992...36 60 62 64 68 70 72 76 80 Industry News Zambia Emerald Auction Dilemma Raises Questions For Investors |
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| 50 52 38 58 60 62 64 66 Industry News Kagem Mining in Zambia Plans to Double Production in Coming Five...WS Kagem Mining in Zambia Plans to Double Production in Coming Five Years Gemfields’ Kagem Mine. K...K agem Mining, the largest emerald producer in Zambia, plans to double production in the coming five...officer. “It is an ambitious program as it will put Zambia at the top of the world market but we will need...a media briefing. Gemfields has revived the emerald mine, since acquiring a share in 2008, by investing |
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| Ilaria Adamo, and Valeria Diella An update on the mining activity, production, and distribution of gem andradite...42 Aquamarine from the Thuong Xuan District, Thanh Hoa Province, Vietnam Le Thi-Thu Huong, Wolfgang...Blue quartz colored by trolleite and lazulite inclusions • Spectral interference in Indian quartz • Indian...in doublets and jewelry • Diamond mining in Liberia • Zambian emerald update • Pargasite from Tanzania...trapiche emerald and rough nephrite • Non-nacreous pearl imitation • Plastic-coated quartz, imitating |
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| DISCOVERY THE DIDY MINE, MADAGASCAR An Outlook on the Resource-rich Hunan Province Origin Determination...Kong Discussions Mining Record-breaking Discovery of Ruby and Sapphire at the Didy Mine in Madagascar:...‘Artificial Blue Glass’ Sold as Rare ‘Haüyne’ Ethical Mining and Fair Trade Tanzania: Ethical Initiatives and...Congress An Outlook on the Resource-rich Hunan Province Book Review World of Magnificent Spinels - Provenance...sold the brand and trademark rights to Milenyum Mining Limited. Turkish Diaspore is a rare, natural gemstone |
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| Science? Ethical Mining and Fair Trade Fabergé and Gemfields Create Fair Trade Emerald Necklace Gemology...Spinel and its Treatments: A Current Status Report Mining Sapphire Rush in Kataragama Jewelry Design Contemporary...determination, thus tracking gemstones from their mining locations. The success of a credible, transparent...heat treatment of corundum, diamond, tourmaline, quartz and other gem materials, spinel has always been...eventually craze, the material from the Wollo Province region is considerably more stable. Francesco |
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| 26 26 Mining A Glimpse of the New Fine Emerald Deposit at Xinjiang’s Davdar Mine Education...photos of activities along the border and of any mining or trading areas in Burma. ICA member Dr. Addie...Addie Peretti has produced a film on the gem mining and trade in Burma which will be aired at the ICA Congress... not just in Myanmar but also in Thailand. ICA Mine Tour – China I mmediately following the Congress...Congress in Panyu, China, ICA will conduct a mine tour to areas in Hangzhou and Shandong and beyond. Participants |
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| Marking of Gemstones – An Overview of Options 86 Mining The Journey Towards Responsibility 94 Book Review...org Editor’s Note Small-Scale and Artisanal Mining: The Other Responsible Sourcing President Clement...developed by—and for—a small number of mega gem-mining and jewelry conglomerates call for strict Western...development for local mining communities in emerging economies. Artisanal and small-scale mining accounts for...colored gemstone output, but well over 80% of active mining operations. It constitutes the core of the offering |
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| Brendan M. Laurs, and Nathan D. Renfro The geology, mining, and gemological characteristics of Tanzanian chrysoprase...cat’s-eye beryl from India • Emerald mining techniques at the Kagem mine, Zambia • Yellow grossular from Tanzania...find of pink-to-red tourmaline in Nigeria • Rough emerald imitation • Silicon inclusions in black synthetic...synthetic moissanite • Dyed sillimanite as an emerald imitation • High-RI Ba-Zr glass • Dyed pink alabaster...Madagascar and eastern Africa, as well as continued mining at historic localities such as Myanmar, Sri Lanka |
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| Offers Valuable Insights From Industry Leaders Jade Mining Expanding in British Columbia As Demand Rises Gemmological...Reveals Largest Violet Diamond Recovered from Argyle Mine Gemology 32 18 21 26 Harvard Mineral Heritage...speaking about the three big colored stones, emerald, ruby and sapphire, the name of a specific country...provenance of colored gemstones all the way to the mine that produce the stone. The vertically integrated...possible tied to transparency and provenance. from mine to market is being developed strongly. As a result |
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| Garnet Deposits − Demantoid Variety 48 Green Dragon Mine − Demantoid from Namibia Branding Signature Colors...gems considered to be “precious” as well, such as quartz, amethyst, aquamarine, jet, onyx and garnet among...This is due in part to an increase in industrial mining. Extraction in various parts of the world has resulted...becomes a trend, something that is much uantities. Mining on an industrial scale also attracts investors...reflect phases of the gemstone industry, such as mining, production or trade. 6. In order to express the |
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| history, geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond...deposits. 68 pg. 49 Causes of Iridescence in Natural Quartz Xiayang Lin and Peter J. Heaney Describes the occurrence...of differential etching, in quartz crystals from India’s Jalgaon District. NOTES AND NEW TECHNIQUES 82...Ethiopian emerald • Burmese gem report • Conversation with Gemfields • Ruby and emerald mining updates...• Cultured pearl market • Moroccan amethyst • Emerald dealing in Afghanistan • Montana sapphire production |
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| Sinkankas Symposium Mining A trip around the gem fields of Eastern Australia Ethical Mining and Fair Trade...The fact that only an extremely small part of a mine run can be polished and used in jewelry further...the definitions and descriptions of irradiated quartz. The Laboratory Book that is currently posted on...Gemmology Commission, provided an update on sapphire mining in Sri Lanka, describing a new sapphire deposit...countries, it covers these sectors vertically, from mine to marketplace, and horizontally within each of |
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| FEATURE ARTICLES 2 Blue Spinel from the Luc Yen District of Vietnam Boris Chauviré, Benjamin Rondeau, Emmanuel...production of Brazilian copper-bearing tourmaline and emerald • Oregon sunstone update • Pearl market updates...crystal quartz • Jadeite with high albite • Moldavite study • Iridescent scapolite • Composite quartz beads...olivine in marble matrix was seen at a mine in the Luc Yen district. Photo by Vincent Pardieu/GIA. Composite...Boudi, Morocco. Their study outlines the geology, mining, and the internal and external features of this |
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| Internet, Fax, and Mail) Heritage Auctions Design District Annex 1518 Slocum Street • Dallas, TX 75207 Session...Collection LOT VIEWING Heritage Auctions Design District Annex 1518 Slocum Street • Dallas, TX 75207 Wednesday...museum-quality Tourmalines, including the 2nd largest Sapo Mine “shaving brush” and an exceptional Elbaite on Feldspar...Feldspar. And then there is another Rose Quartz, smaller than the “Madona Rosa”, but just as choice. There...Auction 2 53001 CALEDONITE Mammoth-Saint Anthony Mine, Tiger, Pinal Co., Arizona, USA Named by the Romans |
