 | Peucat, J.J., Ruffault, P., Fritsch, E., Bouhnik-Le Coz, M., Simonet, C., Lasnier, B. (2007) Ga/Mg ratio as a new geochemical tool to differentiate magmatic from metamorphic blue sapphires. Lithos, 98 (1) 261-274 doi:10.1016/j.lithos.2007.05.001 | Journal (article/letter/editorial) | | found in alkali basalts (e.g. southeastern Asia, China, Africa) are commonly medium-rich to rich in Fe...elements can act as the signature of a single gem-deposit as did oxygen isotope composition (Yui et al.,...matter of debate. Geological settings for each ore deposit are briefly presented in the corresponding section...southeastern Asia, China, and Africa (Fig. 1, Table 2). In the Pailin alluvial deposit (Cambodia), Sutherland...likely correspond to submicroscopic inclusions of spinel, colombo-tantalite and zircons respectively. In |  | | Journal (article/letter/editorial) | | and Chemical Composition of Penglai Sapphire in Hainan Province, China Guang-Ya Wang 1,2 , Xiao-Yan Yu 1...Penglai School of Gemology, China University of Geosciences, Beijing 100083, China; 2009200044@cugb.edu.cn...and Mineral Resources, China University of Geosciences, Beijing 100083, China Southern Marine Science...Guangdong Laboratory (Guangzhou), Guangzhou 511458, China Key Laboratory of Deep-Earth Dynamics, Institute...Academy of Geological Sciences, Beijing 100037, China Shandong Academician Workstation of Diamond Mineralization |  | | Journal (article/letter/editorial) | | include Fe,Cusulphide (low in Ni), cobalt-rich spinel, Th,Ce-rich phosphate and uraninite. The similar...testable. Introduction Most of the worldâs current sapphire production is taken from recent or palaeo-alluvial...distributed in eastern Australia, Thailand and eastern China. The lack of understanding of corundum genesis and...relationship between the occurrence of alluvial sapphire deposits and the presence of basaltic rocks in...Coldham 1985; Krosch and Cooper 1990), eastern China (Keller and Wang 1986; Guo et al. 1992), the Indochina |  | | Journal (article/letter/editorial) | | eastern Australia, far eastern Russia, eastern China, Laos, Vietnam, Thailand, Rwanda, Cameroon, Nigeria...scapolite, serendibite, sillimanite, sinhalite, spinel, spodumene, taaffeite, topaz, tremolite, minerals...pallasite meteorites, gem benitoite from San Benito County California, and Colombian emeralds (for whose genesis...confusion among geologists and mineralogists. âSapphireâ and ârubyâ, for example, are not mineral names... Tanzania and Madagascar. The gravels in each deposit include gem-forming minerals that crystallized |  | | Journal (article/letter/editorial) | | of subcontinental lithospheric mantle, eastern China Yao Yu & Xisheng Xu & Xiaoming Chen Received: 2...deposits associated with Cenozoic basalts from Changle in Shandong Province, Mingxi in Fujian Province and Penglai...Hainan Province within the coastal area of eastern China. They are colourless, transparent to light brownâmaroon...16 mm long. UâPb ages of zircon megacrysts from Changle, Mingxi and Penglai are 19.2Âą0.7 Ma, 1.2Âą 0.1 Ma...megacrysts are 9.02 Âą0.49, 6.83Âą 0.47, 4.46Âą 0.48 for Changle, Mingxi and Penglai, respectively, which indicates |  | 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) | | uncommon on Earth but the gem varieties of ruby and sapphire are relatively rare. Gem corundum deposits are...for gems mined from the modern-day Tajikistan (spinel), and âBohemian rubyâ was used for gems coming... with a hardness of 9 on the Mohs scale (while spinel and garnets crystallize in the cubic system and...and are softer with a hardness of 8). Unlike spinel and garnet, ruby is a dichroic mineral, which will...to product from the Mugloto Mugloto colluvial deposit, which provided clean and very high-quality red |  | 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) | | The oxygen isotopic ratios (18O/16O) of ruby and sapphire from primary deposits are a good indicator of...wide spread between â0.3 and 16.5â°. The ruby and sapphire found in placers linked to alkali basalt environments...blue sapphire, syenite for yellow, green, and blue sapphire, and skarn in marbles for blue sapphire. Keywords... Oxygen isotopes . Corundum deposits . Ruby . Sapphire Miner Deposita (2007) 42:251â270 gem quality...ratios (18O/16O) in the lattice oxygen of ruby and sapphire to provide a gemstone geological identification |  | | Journal (issue) | | INTO CHINA Site of ICA Congress 2009 13 ICA CONGRESS 2009 Panyu, CHINA CONTENTS 5 Foreword 6 ICA...ICA News 10 Color in China 10 Jewelry Development in Panyu â A Story of the Twin Cities 12 The National...and Their Standardization in China 20 Colored Stone Deposits in China 24 Factors Affecting Chinaâs...26 Mining A Glimpse of the New Fine Emerald Deposit at Xinjiangâs Davdar Mine Education 32...13th ICA Congress that is being held in Panyu, China this year. Despite the global economic slowdown |  | | Journal (issue) | | necessarily of the publishers. Cover Picture Burmese sapphire crystal weighing 502 ct, unearthed in 1994 at...Gwebin, in Burma's Mogok Stone Tract. (See Burmese sapphire giants, p. 551) Photo by UKhinMg Win ISSN: 1355-4565...be included in the list of sapphire giants discussed in the Burmese sapphire paper. But with verified occurrences...1355-4565 548 J. Gemm., 1995,24,8 o - I 400m I CHINA NEPHRITE ORE DAEILMIN ~FAULT LEGEN D ALLUV IUM...of Korea J. Gemm., 1995,24, 8 551 Burmese sapphire giants Richard W. Hughes* and U Hla Win** * 4894 |  | | Journal (issue) | | Diamonds Sapphire from Muling, China The History of Pigments Sourced from Gem Materials Pink Spinel from...269 The Geographic Origin of Diamonds, Sapphire from China, and Pigments Sourced from Gem Materials...individual diamond. 290 Sapphire Beneath the Rich Black Soil of Muling, Northeastern China Yimiao Liu and Ren...analysis of blue and fancycolor sapphire from the agricultural area of Muling, China. p. 302 318 Gems on Canvas:...Mechanism and Spectroscopic Thermal Variation of Pink Spinel Reportedly from Kuh-i-Lal, Tajikistan Yicen Liu |  | | Journal (issue) | | Mananjary, on the island's east coast. Both ruby and sapphire were among the stones Professor Smith listed for...(1992)describe an unusual type of m~~lti-colored sapphire from a locality called Ianlzarolza~southwest of...the Andranondambo (also called Andranondamtso) deposit in southern Madagascar has turned out to be a significant...production. The much-talked-about Andranondambo sapphire deposit is not a recent discoveryl although fine-quality... and the ring is set with a 54 ct pear-shaped sapphire. Courtesy of Mozzawad 1ewelers. Hibon reported |  | | Journal (issue) | | The Gemworld Munich, Germany October 26-28, 2012 China International Jewellery Fair November 1-5, 2012...2013 China (Changsha) International Mineral & Gem Show May 16-20, 2013 Jewelry Shanghai, China Working...gemstones such as Paraiba-type blue tourmaline, red spinel and red and pink large tourmalines can command...as green garnet, spessartite, demandoid or blue spinel, are much rarer than the top four precious stones...provided an update on sapphire mining in Sri Lanka, describing a new sapphire deposit, and possibly a primary |  | | Journal (issue) | | 28 ct blue spinel, (6) 1.17 ct benitoite, (7) 2.14 ct blue sapphire, (8) 23.18 ct blue spinel, (9) 4.82...82 ct purple sapphire, (10) 5.32 ct ParaĂba tourmaline, (11) 2.16 ct demantoid, (12) 1.05 ct emerald,...purplepink sapphire, (16) 5.54 ct spessartine, (17) 8.04 ct orange sapphire, and (18) 3.48 ct pink spinel. The...the South Seas, and myriad shapes and colors from China. And where would we be without the process of incorporating...Lanka, India, Afghanistan, Pakistan, Russia, and China), and Australia. The major sources for diamonds |  | | Report (volume) | | associated placer deposits___.______. ______ Yogo sapphire deposit. _________________________________________...setting. ______________________________________ Sapphire-bearing dike_---_-----___-_----_----_------__Sapphires...reserveS--_-_________-.-p-_ __-______--__ Missouri River sapphire deposits .-___________-____-________-_-._ Location...____________________________________ Roek Creek sapphire deposit. _ __________________________________ Location..._________.___.._..___-._-Dry Cotton wood Creek sapphire deposit---... ____________________ Location __.._ |  | | Journal (issue) | | Volume 36 / No. 8 / 2019 Sapphire Intaglio from Pompeii Chinese Synthetic Diamonds Trapiche Rubies...from Pompeii, Italy, proved to be a basaltic-type sapphire (see article on pp. 710â725 of this issue) and...ash. ARTICLES Gemmological Analysis of a Roman Sapphire Intaglio and Its Possible Origin 710 By Michael...Israel; Andy H. Shen, China University of Geosciences, Wuhan; Guanghai Shi, China University of Geosciences...Excellence in Research for Australia (ERA) Journal List; China National Knowledge Infrastructure (CNKI Scholar); |  | | Journal (issue) | | calcite bangles resembling jadeite|Large pink sapphire with diffusioninduced star|Mid-year 2016 Myanma...sapphires. These rubies recovered from the Aappaluttoq deposit weigh 0.29â2.53 ct and were characterized for an... ARTICLES Feature Articles 294 Ruby and Pink Sapphire from Aappaluttoq, Greenland By Christopher P....GemeWizard Ltd., Ramat Gan, Israel; Guanghai Shi, China University of Geosciences, Beijing; James E. Shigley...DK9000, released by DiKai Industrial (Shenzhen, China) in April 2016, is a pen-style thermoelectric probe |  | | Journal (issue) | | a collection of chrysoberyl samples from these sapphire placer deposits to determine their distinct mineralogical...diamond melee ⢠Quench-crackled blue synthetic spinel pg. 93 77 G&G Micro-World Dolomite with unusual...âfootprintâ in rose quartz ⢠Display of phase changes in sapphire fluid inclusion ⢠Iridescent inclusions in scapolite...Blue sapphire rush in Madagascar ⢠Red cordierite from Madagascar ⢠Corundum from Muling, China ⢠âStar...âStar of Davidâ spinel ⢠Colorless HPHT synthetic diamonds from China ⢠Polymer-treated hessonite ⢠Erratum |  | | Journal (article/letter/editorial) | | inclusions 59701 MA ABSTRACT Gem corundum (sapphire) has been mined from an ultramafic lamprophyre...significant advancement in our understanding of sapphire genesis and sheds light on how mantle-derived...the surface. 1 ACCEPTED MANUSCRIPT Keywords: sapphire; corundum; melt inclusions; lamprophyre; liquid...ocelli RI 1. Introduction The Yogo Gulch sapphire deposit in central Montana has produced exceptional...exceptional gem- SC quality corundum (sapphire) for more than 100 years. Discovered by gold prospector Jake |  | | Journal (article/letter/editorial) | | pp. 875-880 GEOLOGY AND ORIGIN OF THE YOGO SAPPHIRE DEPOSIT, MONTANA ARTHUR H. BROWNLOW Departmentof...millioncaratsvaluedin the rough The Yogo sapphire deposit is located in central Montanaapproximately72...454) describedthe depositas the most valuable gem deposit in the United States.At the presenttime it is still...occurrence,properties,and possibleoriginsof the Yogo sapphire. Mining history In 1895 placerminingfor goldalongYogoCreek...1929. There was little mining activity at the deposit from 1929 until 1980. Several unsuccessful at- |  | | Journal (article/letter/editorial) | | 679â684 SCIENTIFIC COMMUNICATIONS THE SILVER BOW SAPPHIRE OCCURRENCE, MONTANA: EVIDENCE FOR A VOLCANIC BEDROCK...BEDROCK SOURCE FOR MONTANAâS ALLUVIAL SAPPHIRE DEPOSITS AARON L. BERGERâ Department of Geosciences, Virginia...The first confirmed bedrock source of alluvial sapphire deposits in southwest Montana has been found 9...source rock of the Silver Bow occurrence is a sapphire-bearing felsic lapilli tuff of the Eocene Lowland...of known primary sapphire deposits and may represent a previously unrecognized deposit type. Mass wasting |  | Palke, Aaron C., Wong, Jacqueline, Verdel, Charles, Ăvila, JanaĂna N. (2018) A common origin for Thai/Cambodian rubies and blue and violet sapphires from Yogo Gulch, Montana, U.S.A.?. American Mineralogist, 103 (3) 469-479 doi:10.2138/am-2018-6164 | Journal (article/letter/editorial) | | proposed for volcanically transported ruby and sapphire deposits around the world. In this contribution...corundum ought to be used with caution. Keywords: Sapphire, ruby, Yogo Gulch, melt inclusions, corundum,...Pacific margin (eastern Australia, southeast Asia, China, eastern Russia). There are also examples in northeast...fields are generally very similar to other alluvial sapphire deposits associated with alkali basalt fields...gem-producing regions are essentially one single deposit straddling the border 469 Brought to you by | |  | | Journal (issue) | | Bernhardt, a n d Fred M o u a w a d The Yogo Sapphire Deposit Keith A. ~ ~ c h a l u k NOTES AND NEW TECHNIQUES...KUDOS FOR "COLOR GRADING OF COLORED DIAMONDS" SAPPHIRE-BEARING ALKALI BASALTS I N NIGERIA Congratulations...two possiblc exceptions, in Nigeria and Southcrn China, but these are not well documented.)" In the Iournal...Froin our description, it is evident that the vast sapphire deposits in central Nigeria are not "a possible...1992. The nzby crystrrls from the Mong Hsu marble deposit have clipymmidnl to barrel-shaped hobils and reverrl |  | | Journal (issue) | | book|Global diamond industry 2015|Flux-grown synthetic spinel|ICGL Newsletter| ISO standards for diamonds| The...GemeWizard Ltd., Ramat Gan, Israel; Guanghai Shi, China University of Geosciences, Beijing; James E. Shigley...Synthetic Spinel In September 2015, Gemresearch Swisslab reported on a new line of synthetic spinel manufactured...Kondoa District, Tanzania A historically important deposit of chrysoprase and prase opal in Tanzania is located...and polished material (e.g. Figure 7) from a new deposit in Tanzania was shown by Werner Radl (Mawingu Gems |  | | Journal (issue) | | Vn1 I I M F Y Y i l GPRlNr. 1QRA CHINA The quarterly journal ot the Lernologlcal Institute ot Amertca...2 2 Number 1 TABLE OF CONTENTS EDITORIALS 1 China Richard T. Liddicoat, Ir. 2 The Gems & Gemology...Resources of China 14 The Changma Diamond District, Mengyin, Shandong Province, China Peter C. Keller...o - d o n g 24 I ( , r Gemstone Carving in China: Winds of c h k g e Sally A . T h o m a s a n d...TECHNIQUES 35 A Gemological Study of Turquoise in China 38 The Gemological Characteristics of Chinese |  | | Journal (issue) | | necessarily of the publishers. Cover Picture Faceted sapphire from Cyangugu district, SW Rwanda. See Investigations...and a higher reading for the diamond/synthetic sapphire doublet. The higher meter reading for paste results...Is the higher reading for the diamond/synthetic sapphire doublet due to deterioration of the adhesive?...Spodumene Diopside Spinel Synthetic spinel Garnet Chrysoberyl Sapphire Synthetic sapphire Anglesite Scheelite...2.68 Synthetic rutile 2.42 Diamond/ synthetic sapphire doublet t § Members having gained their Diploma |
|
