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| Moissanite SiC Crystal Data: Hexagonal. Point Group: 6mm. As hexagonal plates, to 5 mm, platy to elongated...formed in an iron meteorite; as inclusions in diamond; in diamondiferous kimberlites and lamproites,...in alluvium. Association: Iron, diamond (Canyon Diablo); quartz, diamond (Fuxian, China); garnet, coesite...and Aikhal diamond mines, and elsewhere in Sakha, Russia. In the Argyle diamond mine, Kimberley district...district, Western Australia. At a beach along the Turkish coast of the Mediterranean Sea, ~150 km NW from Izmir |
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| AMERICA Rough Diamond Auctions and Their Market Impact Thirty Years of Argyle Pink Diamond Tenders Study...Study of the Blue Moon Diamond Winter 2014 VOLUME 50, No. 4 EDITORIAL 251 A Fitting Conclusion to Our...Anniversary Duncan Pay FEATURE ARTICLES 252 Rough Diamond Auctions: Sweeping Changes in Pricing and Distribution...to Red Diamonds: A Celebration of the 30th Argyle Diamond Tender John King, James E. Shigley, and Claudia...rare polished pink diamonds from Australia’s Argyle mine that have been sold for 30 years through invitation-only |
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| 26 Discovery and Mining of the Argyle Diamond Deposit, Australia James E. Shigley, John Chapman, and...about the development of Australia’s first major diamond mine, the world’s largest source of diamonds by volume...Beryl-and-glass triplet imitating emerald • Diamond with hidden cloud • Diamond with pseudodichroism • Surface features...features of synthetic diamond • Musgravite • Fivestrand natural pastel pearl necklace • Dyed quartzite...Tucson 2000: GIA’s diamond cut research • California cultured abalone pearls • Benitoite mine sold • Emeralds |
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| Department of Geology, University of Western Australia, Nedlands 6009, Australia A. LvNrou JleuBs Bureau of Mineral...Mineral Resources,GPO Box 378, Canberra, ACT 2601, Australia Mrcn.qor, Rrno Chemistry Department, University...Tasmania, GPO Box 252C,Hobart, Tasmania 7001, Australia Ansrucr The proportions ofaggregatedN substitutional...from the Argyle and Ellendale olivine lamproite pipes (Kimberley block of northwest Australia) and alluvial...alluvial deposits in western and central Kalimantan (Indonesia) and Copeton (easternAustralia) using Fourier |
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| SOURCES DIAMOND MANUFACTURING & DISTRIBUTION DIAMOND ECONOMICS PERSPECTIVES ON THE DIAMOND MARKET ...J. Gurney Diamonds from Australia 37 A. J. A. (Bram) Janse Canadian Diamond Production: A Government...40 Douglas Paget Russian Diamond Sources 43 N. V. Sobolev The New York Diamond Market 44 Hertz Hasenfeld...Hasenfeld The Antwerp Diamond Sector 46 Marcel Pruwer The Indian Perspective: Challenges and New Developments...Developments 47 M. A. Mitchell Diamond Manufacturing and Distribution: The Israeli Perspective 49 Shmuel Schnitzer |
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| as well as a contemporary yellow and “white” diamond necklace set in the decade’s most prominent jewelry...ironically, it closed with another threat to the diamond industry: that of “unidentifiable” 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...marketed, and merchandized. In diamonds especially, the mine-to-market process has been severely tested. Vertical |
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| Diamond Formation – Where, when and how? T. Stachel, R.W. Luth PII: DOI: Reference: ...cite this article as: Stachel, T., Luth, R.W., Diamond Formation – Where, when and how?, LITHOS (2015)...to the journal pertain. ACCEPTED MANUSCRIPT Diamond Formation – Where, when and how? a PT T. Stachela...inclusions in diamond indicate MA that formation of the dominant harzburgitic diamond association occurred...Three quarters of peridotitic garnet inclusions in diamond classify as "depleted" due to their low Y and Zr |
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| pg. 46 The Rise to pProminence of the Modern Diamond Cutting Industry in India Menahem Sevdermish, Alan...near-monopoly of the cut diamond industry, and reviews India’s impact on the worldwide diamond trade. The availability...manufacturing sector in India. However, the Indian diamond jewelery–making tradition has been around much...the cover. The necklace contains 31 table-cut diamond panels, with enamels and freshwater pearls. The...freshwater pearls. The bracelet contains table-cut diamond flowerheads with triple-stone intersections. Photo |
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| October 2001 t j Nephrite jade J Synthetic moissanite The Gemmological Association and Gem Testing...Slaski district. J. Gemm., 2001, 27, 8, 461·470 western Europe indicating that it was widely traded and...According to Skelton (1991) nephrite jade from south-western Poland was probably an important source of raw...Moreover, prior to the break-up of the former USSR, the East Sayan Mountains of Siberia were promoted as the...eastern flank of the Sudete Mountains of the north-east Bohemian Massif. They occur on the southeastern |
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| diamonds • Diamond “pearl” necklace • Internal laser drilling update • Unusual “pink” diamond • High-quality...round-cornered rectangular modified brilliant from Cora Diamond Corp.; a 12.53 ct Fancy Intense pink heart shape... LETTERS LETTERS COMMENTS ON THE GIA ANALYSIS OF DIAMOND “FIRE” This article from GIA’s study of the impact...proportions on the appearance of a round brilliant cut diamond (Reinitz et al., Fall 2001, pp. 174–197) is a work...ignoring the vast majority of rays that enter the diamond from directions other than the perpendicular, and |
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| of the Amber Room Color Origin of Gem Diaspore Diamond Inclusions Chart Winter 2018 VOLUME 54, No. 4...Inclusions in Natural, Synthetic, and Treated Diamond Nathan D. Renfro, John I. Koivula, Jonathan Muyal...FEATURES 430 Lab Notes Natural diamond mistaken as HPHT-grown diamond • Manufactured gold-in-quartz •...Kashmir sapphire • Irradiated CVD-grown melee diamond • Lightbox CVD-grown “white” diamonds • Cat’s-eye...• Type IaB diamond with boron • “Guizhou Jade” from Qinglong, China • HPHT-grown diamond found in ring |
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| alert|Pink and blue CVD synthetic diamonds|World Diamond Magazine|Coloured stone app 384 Practical Gemmology...of synthetic moissanite 386 Gem Notes Large kunzite from Brazil| Marble-hosted ruby mine, Mogok, Myanmar|Secondary...imitation of emerald|Large black synthetic moissanite as a black diamond imitation|Peridotpolymer composite|Dyed...Gemmologisches Institut, Hamburg, Germany; Tay Thye Sun, Far East Gemological Laboratory, Singapore; Pornsawat Wathanakul...Terrence S. Coldham, Emmanuel Fritsch Honorary Diamond Member Martin Rapaport Honorary Life Members |
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| 23(5), 278-83 LONDON DIAMOND REPORT The Gem Testing Laboratory 327323 Diamond grading service established...established in 1980 Each diamond graded by three experienced graders Report based on the current international...clarity Whether buying or selling, the London Diamond Report assures the prestige of your stone The...which are said to be very close to the chrysocolla mine (see p.330). The RI of the pink opal is 1.45 1.49...rough on the left is 4 cm wide. The Acari copper mine near Nazca in Arequipa department (close to the |
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| formation. 223 Blue Sapphires from the Baw Mar Mine in Mogok Hpone-Phyo Kan-Nyunt, Stefanos Karampelas...Notes Black diamond with unusual color origin • Silicon in natural type IIa and type IaB diamond • Stellate...morganite • Spinel submitted as diamond • Large synthetic moissanite with silicon carbide polytypes ...Abduriyim Tokyo, Japan A.J.A. (Bram) Janse Perth, Australia George R. Rossman Pasadena, California Shigeru...of the geology of diamonds. The cover image, of diamond crystal in kimberlite matrix, was chosen to highlight |
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| JOHANNESBURG 5:00 P M Diamond graders inscribe a diamond and issue a GIA Diamond Dossier® A $97.00 value...plasma-etching diffraction grating patterns on diamond facets produces a more fiery appearance. NOTES...indicates treatment in irradiated brown-orange diamond • Diamond with flower-shaped cloud • Unusual trigonshaped...rough • Fancy Intense blue type IIb synthetic diamond • Colorless cat’s-eye phenakite • Blue sapphires...from India • Emerald mining techniques at the Kagem mine, Zambia • Yellow grossular from Tanzania • An unusual |
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| French Blue and the Hope Gray-to-Blue-to-Violet Argyle Diamonds VOLUME 45 NO. 1 Hackmanite THE QUARTERLY...recently discovered lead cast of the French Blue diamond reveals important details about this fabled gem...Gray-to-Blue-to-Violet Hydrogen-Rich Diamonds from The Argyle Mine, Australia Carolyn H. van der Bogert, Christopher...McClure Famed for its pink and “champagne” diamonds, Argyle is the only known source of the rare type IaB hydrogen-rich...assemblages in diamond etch channels • Clarity grading radiation stains • Rare mixed type (Ia/IIb) diamond with |
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| INSTITUTE OF AMERICA The Future of Botswana’s Diamond Industry Determining Emerald Origin from Multiphase...Weldon and Russell Shor Examines the history of diamond production in Botswana and the long-term outlook...141 151 Thank You, Donors Lab Notes Chameleon diamond with nickel absorption band • Long-term durability...natural diamond • Star opal • Shell pearl as pearl imitation • Yellow CVD synthetic diamond • Flux-grown...by Brazil-law twinning • Record-size natural moissanite crystals discovered in Israel • Unusual optical |
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| Top 6 7 1 Top Bottom Bottom 3 4 5 1 DIAMOND DEPOSITS Origin, Exploration, and History of Discovery...SME diamond_title2 9/3/02 9:29 AM Page 1 DIAMOND DEPOSITS Origin, Exploration, and History of Discovery...CHAPTER 1 HISTORY OF DIAMOND DISCOVERIES 1 Introduction 3 History of Diamond Discoveries References...References 29 CHAPTER 2 DIAMOND MORPHOLOGY 3 3 33 General Properties and Internal Structure Crystal Habit...Habit 37 Varieties of Diamond 38 Dissolution Phenomena 44 References 46 CHAPTER 3 AGE AND ORIGIN OF DIAMONDS: |
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| Emeritus Professor of Geology University of Western Australia in recognition of his pioneering studies of...stem from the recognition of diamond-bearing lamproites in Western Australia and the reclassification of...of several anomalous diamond-bearing kimberlites as lamproites. Consequently lamproites, previously of...igneous petrology, have become prime targets for diamond exploration on a worldwide basis. Contemporaneously...for geologists concerned with exploration for diamond, and petrologists and geochemists interested in |
 | Griffin, W. L., Jaques, A. L., Sie, S. H., Ryan, C. G., Cousens, D. R., Suter, G. F. (1988) Conditions of diamond growth: a proton microprobe study of inclusions in West Australian diamonds. Contributions to Mineralogy and Petrology, 99 (2) 143-158 doi:10.1007/bf00371457 | Journal (article/letter/editorial) |
| 99:143 158 9 Springer-Verlag1988 Conditions of diamond growth: a proton microprobe study of inclusions...Exploration Geoscience, Box 136, North Ryde, NSW 2113, Australia 2 Division of Petrology and Geochemistry, Bureau... ACT 2601, Australia Abstract. Crystalline primary inclusions in diamonds from the Argyle and Ellendale...microprobe. Eclogite-suite inclusions dominate at Argyle and occur in equal proportions with peridotite-suite...Type I eclogite xenoliths from the Roberts Victor Mine. Crystallization temperatures of the eclogite-suite |
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| turquoise shown here, which is from the Sleeping Beauty mine in Arizona, has been treated by this method. The...composed of 12.5 mm turquoise beads separated by diamond rondelles, with a white gold clasp containing 1...anticipate periods of economic instability in the diamond and colored stone markets, and must be aware of...Rooms— on appraisals, disclosure, branding, and diamond cut— where attendees and panelists will interact...Peter Ueberroth and the senior statesman of the diamond industry, Maurice Tempelsman. And Symposium is |
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| Modeling the Appearance of the Round Brilliant Cut Diamond: An Analysis of Fire, and More About Brilliance...and James E. Shigley GIA’s latest research on diamond cut introduces a metric for fire, DCLR, and reveals...pale purple to purplish pink garnets from the Western Alps of Italy. 206 Jeremejevite: A Gemological...•Conch “pearls” •13 ct datolite •Carved “Hamsa” diamond •Heat-treated black diamonds •Update on blue and...International •2nd World Diamond Conference •Diamonds from Copeton,Australia •Maxixe-type beryls •Gems |
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| natural hiscory: • Madame the Coun<= of P..ui, Diamond Museum. Diamantina. B,.,.iJ (Till P<:>1an,) HSH...cheir ream. We would also like co thank the DTC, Diamond Trading Company, parr of the De Beers group. le...narurdle in Paris. He also has long experience in the diamond field. in his capacity as an amateur mineralogist...\bnufacruras. P.1ri,. Tiffany C1eations All about diamond in 50 words Bibliography Menahem Sevdermish Founder...discovering the invisible 44 JV. Diamond channels: the international diamond supply chain Mmahem Sevdermish |
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| Mantle xenoliths from the Jetty Peninsula area (East Antarctica): samples of thermally eroding lithosphere... 20 Three-Stage Growth Model of the Natural Diamond of Octahedral Habit. 23 Petrography and mineralogy...Experimental Study of Growth and Resorption of Diamond in Kimberlitic Melts at High Pressures and Temperatures...crystalline inclusions and the real structure of diamond. Morphology and Composition of Chromite Macrocrysts...Kimberlite Field, Venezuela. Primary and related diamond occurrences within a Phanerozoic subduction regime |
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| 2000 VOLUME 36 NO. 3 pg. 197 EDITORIAL 189 New Diamond Treatments: What Do They Mean for the Gemological...flower-like inclusions • Historical diamond report • Black synthetic moissanite • Fracture fillers in ruby •...America All rights reserved. ISSN 0016-626X New Diamond Treatments: What Do They Mean for the Gemological...designed to measure the presence and level the diamond industry has ever faced. Most of these artiof trace...trace elements, such as nitrogen, in each diamond. cles have dealt with the decolorizaAll diamonds that |
