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| Around the World 22 Cover Stories Bemainty Sapphire Deposit in Madagascar Faces Multiple Challenges 46 ...Gemstone & Jewelry Industry 42 Sapphires from Bemainty and Beyond 66 12 32 Spring 2017 ISSUE 35 ... Identification of Sapphires from Madagascar with Inclusion Features Resembling Those of Sapphires from...Colored Gemstone Association The sapphires of Bemainty. See Cover Stories, starting page 22. (Cover photos...Sapphires from a New Deposit at Bemainty near Ambatondrazaka in Madagascar InColor Editorial Committee |
 | 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) |
| Published: 30 June 2020 Abstract: Corundum is not uncommon on Earth but the gem varieties...of ruby and sapphire are relatively rare. Gem corundum deposits are classified as primary and secondary...secondary deposits. Primary deposits contain corundum either in the rocks where it crystallized or as xenocrysts...the Earth’s surface. Classification systems for corundum deposits are based on different mineralogical...magmatic) origin are hosted by alkali basalts (Madagascar and others), and Type IB corresponding to xenocrysts |
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| Ruby from Mozambique Low-Temp Heat Treatment of Madagascar Sapphire Black Nephrite Jade from Southern China...EDITORIAL 161 Dive Into Summer: Mozambique Ruby, Madagascar Sapphire, and Black Nephrite from China, Plus...now the world’s most productive source. 184 Madagascar Sapphire: Low-Temperature Heat Treatment Experiments...Hughes and Rosey Perkins Shows how the color of Madagascar sapphire is lightened with heating to relatively...0016-626X Dive Into Summer: Mozambique Ruby, Madagascar Sapphire, and Black Nephrite From China, Plus |
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| Brief History of Gem Corundum Heat Treatment in Thailand The Heat Treatment of Corundum at Moderate Temperature...creations, including blue sapphire rings (Burma, Madagascar and Sri Lanka), a Cartier emerald ring and an...InColorMagazine.com; Gemstone.org InColor Cushion-cut Madagascar sapphire (16.88 cts) and triangular-cut diamond...electric furnace after heat treatment of rubies from Madagascar with lead rich glass. (Photo: Mahiton Thongdeesuk...Valley in northern Tanzania. The area has produced corundum of all colors: blue and yellow sapphires and even |
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| studies, namely ruby, the red-colored gem variety of corundum. The color results from a sufficiency of the trace...Wang, K.; Tarantola, A.; Zaw, K.; Meffre, S. Gem corundum deposits of Greece: Geology, Mineralogy and Genesis...Griffin, W.L.; Saunders, M.; Toledo, V. Chromium in Corundum: Ultra-high Contents under Reducing Conditions...new research territory [8–13]. Research into gem corundum, however, is a continuing process, and new aspects...that determine the spectrum of colors seen in gem corundum shows that their combined individual effects can |
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| sapphires from Madagascar, Myanmar and Thailand|GIT Lab Update on grandidierite from Madagascar|Goldsmiths’...SSEF Trade Alert on Kashmir-like sapphires from Madagascar| World Bank report on Ethiopia’s coloured stone...Ethiopia|Tourmaline from Mwajanga and Simanjiro District, Tanzania|Alluvial diamond mining in South Africa|...CMS sources in Madagascar. GIA News from Research: Sapphires from Bemainty, Madagascar In February 2017...‘Sapphires from the gem rush Bemainty area, Ambatondrazaka (Madagascar)’ at www.gia.edu/ gia-news-re |
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| RESEARCH Jewellery Matters Symposium GemTOF Madagascar/Kashmir sapphire SGG 75th anniversary Age dating...rr Figure 1: Fancy sapphire recently found in Madagascar showing an unstable colour, shifting from pinkish...the stability of colour centres T he colour of corundum varieties is commonly related to the presence...past year, a new corundum deposit emerged near the small town yellow. of Ambatondrazaka in Central-East...Central-East Madagascar (see last SSEF Facette, are in fact structural defects at an atomic level, which when |
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| industry today. FEATURE ARTICLES 464 Geology of Corundum and Emerald Gem Deposits: A Review Gaston Giuliani...our knowledge of the geology and genesis of gem corundum and emerald deposits. p. 569 512 A Review of...had to go on. GEMS & GEMOLOGY WINTER 2019 Madagascar are from metamorphic deposits, but the deposits...basalts—two very different deposits, yet both from Madagascar. As stated earlier, when geographic origin determination...ring, courtesy of Ronald Ringsrud; a 7.04 ct Madagascar sapphire, courtesy of Mayer & Watt; and an exceptional |
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| – 11:20 Coffee breaks and posters Session 7 Corundum 1: Chairman Claudio Milisenda 11:20 - 11:40 Rainer...Rainer Schultz-Guttler, Bruno Zampaulo: unusual corundum (ruby) bearing rocks from Brazil and India ...from a new occurrence from Paramathi in Karur district of Tamil Nadu, India. 12:00 – 12:20 Wilawan...Lunch in the multi-purpose area R0 Session 8 Corundum 2 : Chairman Michael Krzemnicki 14:00 – 14:20...nano-inclusions in untreated blue sapphire from Diego, Madagascar. 14:20 – 14:40 Wiwat Wongkokua , Natthapong |
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| forsterite from Vietnam|Sapphire from Ambatondrazaka, Madagascar| Colour-change scorodite from Tsumeb...1943; Saalfeld and Jagodzinski, 1957). Unlike corundum, since it is difficult to grow synthetic spinel...Illinois, USA The Illinois-Kentucky Fluorspar District in the east-central USA was a famous producer...Goldstein A., 1997. The Illinois-Kentucky Fluorspar District. Mineralogical Record, 28(1), 3-49. Smath R.A...the Western Kentucky Fluorspar District and the Illinois Fluorspar District and a Tour of the Ben E. Clement |
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| desert outback where opal is found. In the Winton district exists the early mining settlement of Opalton...custodians of the land in the Lightning Ridge district and pay respects to Elders past and present. ...first stones were in 1994 from the Menz Gishe District) also revived interest for this material. In high...padparadscha-like fancy sapphires from the Ambatondrazaka area in Madagascar appeared on the market, partly of...full disclosure. Color instability of certain corundum varieties (mainly yellow sapphires) is not new |
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| Valley, Afghanistan • Sapphire rush near Ambatondrazaka, Madagascar • Trapiche-type sapphire from Tasmania...tourmaline from Afghanistan, a new sapphire rush in Madagascar, and trapiche-type sapphire from Tasmania. This...While Thailand and Sri Lanka control the global corundum cutting industry, Jaipur excels in many different...of cobbed and heated blue apatite rough from Madagascar await faceting into calibrated cuts. Photo by...purchased from Madagascar (figure 19), fire opal from Mexico, morganite from Madagascar and Brazil, and |
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| in origin determination China lectures Dyed corundum from Burma Gemflix talk Synthetic ruby with...Sapphires New 'Kashmir-like' Sapphires from Madagascar (Trade Alert) Introduction of Automated Diamond...releases about new ‘Kashmir-like’ sapphires from Madagascar (published March 2017) and new emeralds from...contributions: first about a new deposit near Ambatondrazaka in Madagascar providing sapphires of velvety blue... from Sri Lanka (Schmetzer et al. 2003) and Madagascar (Vertriest et al. 2015, Bruyère et al. 2016) |
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| synthetic and treated), spinel, What’s New corundum, alexandrite, tanzanite, zircon, Imperial topaz...diamond, tourmaline, demantoid, spinel, emerald, corundum and instrumentation. CMS oration of pearls by...minerals. The mining area is situated in the Kyaukme District of northern Shan State, approximately 18 km southeast...from Mozambique (Muva), Russia (Malkhan District), Madagascar (Tsilaisina) and Nepal. The Ca contents...Africa region, including Kenya, Tanzania and Madagascar; additional occurrences are known in Pakistan |
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| with giant fluid inclusion • Grandidierite from Madagascar • Mexican demantoid from new deposits • New natural-color...green chalcedony • Rubies from new deposit in Madagascar • Plastic imitation of golden coral • Conference...from a new deposit in Zahamena National Park, Madagascar. There are also reports from the 2015 Geological...color-change behavior of pyrope-spessartine garnets from Madagascar (Krzemnicki et al., 2001; Schmetzer et al., 2009)...Color change pyrope-spessartine garnet, also from Madagascar. G&G, Vol. 34, No. 3, pp. 222–223. Koivula J |
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| green/brown dravite from the Commander mine, Simanjiro District, north-eastern Tanzania. A crystal fragment that...Gem Notes: Tourmaline (dravite) from Simanjiro District, Tanzania. Journal of Gemmology, 35(6), 481-482...basaltic-type sapphires from Australia, Diego Suarez (Madagascar), Shandong (China) and Nigeria are Gem Notes...will result in valueless, dark, almost opaque corundum. The very dense silk is cut away from the stones...shown by the 50.55 ct rock crystal quartz from Madagascar in Figure 28. The stone measures 22.6 mm in diameter |
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| Assemblage in Emerald | Six-Rayed Star Enstatite from Madagascar | Yellowish Green Enstatite (and Star Enstatite)...Powellite and Molybdenite Inclusions | Quartz from Madagascar with Fuchsite Phantom Inclusions | Tourmaline...Ming Cultured Pearls | Dyed Banded Agate from Madagascar Cover photo: An 11.62 ct intaglio excavated...Trapiche Ruby from Khoan Thong, Luc Yen Mining District, Northern Vietnam 726 By Isabella Pignatelli...an existing deposit such as those in the Karoi District or the Zambezi Valley (cf. www.mindat.org/ locentries |
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| LANKA N Colombo Tissamaharama 0 200 km district” of Telangana State (Phani, 2014). Taken together...for Si and ca, hematite for Fe, cr2O3 for cr, corundum for Al, MnTiO3 for Mn and Ti, and MgO for Mg)...gemologists can easily separate them from gem corundum of different geographic origins throughout the...and clinopyroxene with minor analcime, calcite, corundum, and other trace accessory minerals. Also occurring...Importantly, Dahy (1988, 1991) reported the finding of a corundum-bearing plagioclase/clinopyroxene xenolith, which |
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| artisanal miners are such minerals as gold, diamonds, corundum (sapphires), cinnabar, cassiterite, sulfur, heterogenite...artisanal miners working in the sapphire pits in Madagascar. (WIKIMEDIA COMMONS) 32 ROCKNGEM.COM Artisanal...artisanal jade miners. In the late 1990s in southern Madagascar, an island nation of Africa’s east coast, a sapphire...attracted thousands of artisanal miners. By 2005, Madagascar was producing 40 percent of the world’s sapphires...major sapphire discovery, this one at Bemainty in northeast Madagascar, attracted 1,000 artisanal miners |
