 | | 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 |  | | Catalog/List | | SignatureĀ® Internet Session 2 Heritage Auctions Design District Annex 1518 Slocum Street ā¢ Dallas, TX 75207 (HERITAGELive...the Tsumeb Mine (as well as other mines of the region) were still in production in the 1970s. You will...Lesotho (formerly Basutoland) to visit the alluvial diamond diggings at Letseng-La-Terai ā he was imprinted...metallurgist with De Beers at their Oranjemund diamond mines on the remote and desert-like "Sperrgebiet"...Azurite Level 8, Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia If the attachment point on the back of |  | | Journal (issue) | | as well as a contemporary yellow and āwhiteā diamond necklace set in the decadeās most prominent jewelry...ironically, it closed with another threat to the diamond industry: that of āunidentifiableā high pressure/high...computer power and programming ability, cut in diamond became an important focus. Researchers were able...with innovations in communication. Top: GE POL diamond / Bottom: Synthetic diamonds T Editorial During...recently stated shift from controlling diamond supply to driving diamond demand, alternative channels will |  | | Journal (issue) | | OāDonoghue Honorary Fellow: E. Fritsch Honorary Diamond Member: M. Rapaport Honorary Life Members: A.J...emerald mine is part of Colombiaās Muzo mining region, an 800 km2 area that encompasses the famous Muzo...emerald district in Colombia, and it is the most productive and well-known emerald mining region in the...historic mine to other famous producers in the region. Keywords: Colombia, emerald, geology, inclusions...PeƱas Blancas, located in the famous Muzo mining district. This mine has rarely been mentioned in gemmological |  | | Journal (issue) | | find in tourmaline deposit in Nigeria 21 Panama Diamond Exchange holds inaugural ceremony 25 Brazil hopeful...South Korea Kamal Kothari, India Bhadresh Pandit, Tanzania Clement Sabbagh, Brazil Capt. Ramji Sharma, Japan...of the to the UAE, during the Dubai show where region. To aid ICA exhibitors, worldwide ļ¬nancial crisis...computer equipment at the schools in the Tourmalina district of Minas Gerais. The ICA contribution is part...savorite beneļ¬ts from the marketing eļ¬orts of the diamond trade that have intensively educated the consumer |  | | Journal (issue) | | __________________ 166 An Era of Sweeping Change in Diamond and Colored Stone Production and Markets Russell...Dirlam A summary of the decadeās most important diamond, colored stone, and pearl sources. Includes a wall...decade of the 2000s saw dramatic changes in the diamond and colored stone industries, as established conventions...The gems in the foreground are: (1) a 1.01 ct diamond, GIA Collection no. 37583 (2) a 4.50 ct emerald...courtesy of Equatorian Imports; (3) a 1.53 pink diamond from Argyle, courtesy of Rio Tinto; (4) an 11.16 |  | | Journal (issue) | | alluvial sapphires from Russiaās Jewish Autonomous District. 266 A New Deposit of Gem-Quality Grandidierite...beam irradiation of treated pink diamond ā¢ Treated pink type IIa diamond colored by red luminescence ā¢ Very...Very large artificially irradiated diamond ā¢ Unusual purple inclusion in emerald ā¢ Spondylus calcifer...rough ā¢ Large crystal inclusion in CVD synthetic diamond ā¢ Screening of HPHT synthetic melee with natural...in Mexico ā¢ Colored gemstone mining update from Tanzania ā¢ Purple pyrope-almandine garnet from Mozambique |  | | 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;...Collection on permanent display at the Israel Diamond Museum. States and other countries only to realize...minister of mineral resources who said he believed the region needed new areas to prospect, as there have been |  | | Journal (issue) | | we titled āA Solution to Diamond Color Grading Problems.ā Obviously, diamond color grading problems remain...moissanite all āscreamā that the stone is not a diamond. Therefore, the user will be seeking a confirmation...marketplace, all plausible diamond simulants showed less reflectivity than diamond, and many reflectivitymeter...which has a greater intrinsic reflectivity than diamond, changed that. Moreover, we now know that one can...that of diamond by oxidation or other methods. When using a reflectivity meter to examine diamond simulants |  | | Journal (article/letter/editorial) | | metamorphic-type sapphires from Sri Lanka, Madagascar, and Tanzania were studied here using LA-ICP-MS, electronprobe...corundum. Methods Materials Sapphires from Tunduru, Tanzania; Elahera, Sri Lanka; Andranondambo, Madagascar...Montana, U.S.A.; ROC, a sapphire from the Rock Creek district of Montana, U.S.A.; and ANA, a sapphire from the...linear patches of included areas (Figs. 2eā2f). The Tunduru gem field is also an alluvial deposit, but is also...d) Elahera, Sri Lanka = ELA, and (e and f) Tunduru, Tanzania = TUN. Positions of LA-ICP-MS analyses are |  | | Journal (issue) | | Latest-Generation CVD-Grown Synthetic Diamonds from Apollo Diamond Inc. Wuyi Wang, Matthew S. Hall, Kyaw Soe Moe...vivid ācanaryā yellow elbaite from the Lundazi District of eastern Zambia, the most important source of...TECHNIQUES ________ 352 An Examination of the Napoleon Diamond Necklace EloĆÆse Gaillou and Jeffrey E. Post pg...photoluminescence feature in a type IIa diamond ā¢ Diamond with āholidayā inclusions ā¢ Diamond with large etch channels...channels containing iron sulfides ā¢ Black diamond with an oriented etch channel ā¢ The pareidolia of diamonds |  | | Journal (issue) | | - Lizard in Amber an Artefact? - CVD synthetic Diamond - Dyeing of Gemstones - Lead glass in Ruby - SSEF...since over 25 years abroad, mainly in Thailand, Tanzania, Kenya and Madagascar. He speaks besides German...the trip from Nairobi and visited Madagascar and Tanzania within three weeks. It was surprising to see how...Chanthaburi as in Tananarivo or in Mombasa or Arusha. Tanzania Werner Spaltenstein sat in the ofļ¬ce of his agent...plane Fig.2 River landscape at the Muhuwesi near Tunduru (STanzania) containing gem minerals in its gravels |  | | Journal (issue) | | SSEF AT AUCTIONS / MOGOK EXPEDITION / NEW ASDI DIAMOND MACHINE DNA IN PEARLS / COLOUR-CHANGE GARNETS /...with the development of an automated spectral diamond inspection back even further as the SSEF celebrates...Quality control of melees ASDI (Automated Spectral Diamond Inspection) DNA fingerprinting of pearls Blue cobalt...houses have emerald necklaces: The emerald and diamond necklace by Cartier, considerably contributed...New York, and the historic 34.98 ct Beau Sancy diamond, which was in possession of European royal dynasties |  | | Journal (issue) | | to those found in the Umba valley and Tunduru area in Tanzania whereas the blue sapphires are reminiscent...similar to the alluvial deposits of Sri Lanka and Tanzania and the three areas may have been part of single...of the discovery spread, people from the whole region rushed to the area seeking their fortune in gemstones...been concentrated in three main areas. The first region includes a 90 x 20 km wide belt between Ranohira...the colours of sapphires found in Tanzania (Umba valley and Tunduru). Madagascar has however yielded pink |  | | Journal (issue) | | of African origin, most probably all from Tunduru, Tanzania, are presented. The faceted gemstones were...and recently, several samples from the Tunduru area in Tanzania have been described (anonymous, 1996;...and quantitative chemical data of material from Tanzania are unknown. Due to the similar chemical composition...Schmetzer, 1998). Because all specimens from Tunduru have so far been determined only by traditional...is not known whether the samples described from Tanzania as taaffeites (anonymous, 1996; Burford, 1998) |  | | Journal (article/letter/editorial) | | average lay reader. The chapters include: What is Diamond? (G. Harlow); The Nature of Color in Diamonds (E...Mantle (G. Harlow, V. Shatsky, and N. Sobolev); Diamond Sources and their Discovery (A. A. Levinson); The...Historical Overview of Diamond Cuts (B. Zucker); Regal Ornaments: Six Centuries of Diamond Jewelry (D. Scarisbrick);...Scarisbrick); The Diamond Love and Marriage Ring (D. Scarisbrick); The Value of Diamonds in English Literature...Literature (C. Slade); Diamond Treasures of Russia; Diamond Jewelry for Everyone (J. Zapata); Hollywood Loves |  | | Journal (issue) | | is a dominant lithology within the Okkampitiya region. The marble is composed mainly of calcite and dolomite...provenance further north, possibly from the Bibile region. In contrast to the effects of strong mechanical...anear-colourless near-colourlesstype typeHaIIadiamond diamond showing showinga aN-V N-Vcentre centre Hence, emissionis...which whichare arerare rareononthe thediamond diamond diamonds, market(approximately (approximately1%...POL diamonds. It also describes the SSEF Type Ha Diamond Spotter, a new simple device for a quick identification |  | | Journal (issue) | | Spinels from Sri Lanka 54 The Spinels of Mahenge, Tanzania In Search of Cobalt Blue Spinel in Vietnam Spinel...InColor Summer 2019 A 7.13-ct spinel from Mahenge, Tanzania. Cover image: Prangpak Ruahong, Nomads. 40 100...015,000 Lot 140: Enameled, ruby, emerald and diamond model of a parrot, Hyderabad, Deccan, ca 1775-1825...98-ct emerald with two interchangeable emerald and diamond mountings, 19th century, Cartier, mid- to late-...Taj Mahal Emerald, carved 141.13-ct emerald and diamond brooch, in gold and platinum, Cartier. Price realized |  | | Journal (issue) | | James E. Shigley 260 Synthetic Moissanite: A New Diamond Substitute Kurt Nassau, Shane F. McClure, Shane...Perspective T he effect of ultraviolet fluorescence on diamond appearance has been hotly debated for at least...negative effect on the overall appearance of a diamond. In fact, the results support the age-old belief...important trade concerns. Thus, we believe that the diamond fluorescence article is as significant a contribution...negative effect on the overall appearance of such a diamond. Visual observation experiments were conducted |  | | Journal (issue) | | Nanocut Plasma-Etched Diamonds Chrysoprase from Tanzania Demantoid from Italy THE QUARTERLY JOURNAL OF...JOHANNESBURG 5:00 P M Diamond graders inscribe a diamond and issue a GIA Diamond DossierĀ® A $97.00 value...plasma-etching diffraction grating patterns on diamond facets produces a more fiery appearance. NOTES...Chrysoprase and Prase Opal from Haneti, Central Tanzania James E. Shigley, Brendan M. Laurs, and Nathan...indicates treatment in irradiated brown-orange diamond ā¢ Diamond with flower-shaped cloud ā¢ Unusual trigonshaped |  | | Journal (issue) | | grading system revolutionized the manufacture of diamond jewelry because it allowed for tighter control...Harry Winston Inc. The D color, VVS2 heart-shaped diamond in the other ring weighs 10 ct; from Mona Lee Nesseth...courtesy of Louis Glick & Co. The necklace is a diamond sautoir by Van Cleef & Arpels, Paris, circa 1925;...322 Rubies and Sapphires from Winza, Central Tanzania Dietmar Schwarz, Vincent Pardieu, John M. Saul...brown-yellow zoned type IIa/IIb diamond ā¢ HPHT-treated CVD synthetic diamond submitted for Dossier grading |  | | Journal (issue) | | Index ABOUT THE COVER: The historic Ouro Preto region of Minas Gerais, Brazil, is world-renown for the...Capiio mine is one of the most productive in the region. This mine and the superb topazes produced there...Today, the region lznown i n the world gem market as the Ouro Preto Imperial topaz district comprises...operation is the Cap50 mine, in the Rodrigo Silva district. Specimens and information about that mine were... Figure 1. The fine Imperial topazes from the region near Ouro Preto, in Minas Gerais, Brazil, are most |  | 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) | | rather comprehensive system established by the diamond trade based on the 4Cs (i.e., color, clarity, cut...valued than an equivalent-sized flawless colorless diamond. The world record price for a single ruby sold...Vatomandry; (2) Andriba; (Antsirabe-Antanifotsy region, Soamiakatra-Ambohimandroso; Ambohibary); (3) Zazafotsy;...Zazafotsy; Ankaratra (Antsirabe-Antanifotsy region, Soamiakatra-Ambohimandroso; Ambohibary); (3)IlakakaZazafotsy;...John Saul mine; Penny Lane; Aqua, Hard Rock). Tanzania: (10) Umba (9) Mangare (Rockland-formerly John |  | | Journal (issue) | | during field mapping in the An Phu area (Luc Yen district), 270 km north of Hanoi (Figure 3). This corundum...Nuoc Ngap, Hin Om, Khau 174 The Quy Chau mining district is located about 120 km north-west of the city...Between 1989 and 1990, 10,000 miners migrated to the region from all over Vietnam. The illegal mining activities...of gem corundum deposits in the Luc Yen mining district, (a) Ruby in a marble from the Min Thten mine...margarite (Bai Da Lan mine, Figure 6c, Minh Tien region, Figure 6d). Gravels form placer deposits in karst |  | | Journal (issue) | | Ramaura synthetic ruby, 1.05 ct natural ruby from Tanzania, and 0.57 ct Swarovski flame-fusion synthetic...Si, Fe, Be; Umba Valley, TanzaniaāFe, Si, Ti, Cr, V, Mn; Morogoro, TanzaniaāTi, Si, Cr, Fe, V; Tsavo...Surdez, 1994; Peretti et al., 1995) NepalāTaplejung district (Harding and Scarratt, 1986; Smith et al., 1997)...Kane, 1997) RussiaāUral Mountains (Kissin, 1994) TanzaniaāMorogoro (HƤnni and Schmetzer, 1991) Tajikistanāeastern...1982; Hunstiger, 1990b; Levitski and Sims, 1997) TanzaniaāUmba (Solesbury, 1967; Zwaan, 1974; HƤnni, 1987) |
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