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The Journal of Gemmology Data Depository Photomicrographs To
The Journal of Gemmology Data Depository Photomicrographs to accompany the article: Hänni H.A., Brunk R. and Franz L. 2021. An investigation of grinding hardness of some ornamental stones. Journal of Gemmology, 37(6), 2021, 632–643, https://doi.org/10.15506/JoG.2021.37.6.632. The following photomicrographs of thin sections of the samples were made with a Leica DFC490 camera mounted on a Leica DMRD polarising microscope with transmitted light. For each sample, figure A shows the sample in plane-polarised light (II Pol.) and figure B with crossed polarisers (X Pol.); the sample numbers correspond to those in the article. Photomicrographs © L. Franz. 1 1 Aventurine quartz, green: Foliated matrix with aligned quartz (Qz) grains, fuchsite (Fu) tablets and accessory zircon (Zrn). 2 2 Aventurine quartz, orangey red: Mylonitic fabric with quartz (Qz) ribbons and recrystallized grains as well as intergrowths of muscovite with hematite (Ms & Hem). 3 3 Chalcedony, light grey: Intensely interlocked chalcedony (Chc) crystals with random orientation. 4 4 Chrysoprase: In a matrix of tiny chalcedony (Chc) and quartz (Qz) crystals, larger quartz aggregates occur. In microfractures, palisade-shaped chalcedony crystals and quartz grains formed. 5 5 Dumortierite: A banded texture with layers rich in dumortierite (Dum), dumortierite and quartz (Dum & Qz), quartz (Qz) and tourmaline (Tur). 6 6 Granite: The holocrystalline fabric is made up of subhedral plagioclase (Pl), orthoclase (Or), biotite (Bt) and anhedral quartz (Qz). 7 7 Green quartz: A granoblastic texture made up of large quartz (Qz) crystals as well as a microfolded layer of fuchsite (Fu). 8 8 Heliotrope (bloodstone): Green, brown and colourless accumulations of chalcedony (Chc) are recognizable. -
Wetedge Catalog
PRODUCT CATALOG 1 OUR STORY 3 HOW DID WE FACILITIES 4 GET HERE? PRODUCT LINE Years ago our founder, Laurence Turley, PRIMERA STONE 8 started his career in the mining industry. His worldwide experience in mining led SERENITY STONE 12 him to source exclusive materials from PRISM MATRIX 14 remote regions of the globe. In the early 80’s he focused his energy on the SIGNATURE MATRIX 17 pool industry and later formed Wet Edge Technologies. LUNA QUARTZ 21 Wet Edge Technologies has grown into ALTIMA 25 an industry leader through constant WATER COLOR HUE GUIDE 26 innovation in manufacturing, sourcing and application of our products. We THANK YOU 30 have introduced many new concepts and materials into the pool industry. These new additions enhance both the beauty and durability of our pool finishes. wetedgetechnologies.com 3 THE WET EDGE DIFFERENCE The stones used in our products have been shaped by water over millennia. Their roundness comes from the rushing water of rivers, the ebb and flow WESTERN PRODUCTION DRYING & SCREENING PLANT of tides, the endless motion of ocean waves, the ARIZONA MISSISSIPPI slow march of glacial movement and countless cycles of ice melting. We go to great lengths and expense to discover, recover and import these exotic stones from all over the globe. The roundness of our stones give you the smoothest pool finishes possible. Additionally, we control all aspects of sourcing, sizing and bagging our pebbles to ensure consistency and quality. Our proprietary admixtures used in all Wet Edge products fortify strength and bonding quality of each pool finish, giving you the longest lasting pool finish available. -
The Good Germans the Hemmerles, Munich’S First Family of Jewelry, Design Baubles That Are Truly One of a Kind
Clockwise from left: Chris- tian and Stefan Hemmerle at home; Hemmerle’s 18k white gold, black iron and aquamarine ring, 18k red gold, moonstone, amethyst and sapphire brooch, and 18k white gold, red patinated copper, spinel and amethyst earrings, prices available upon request, at Hemmerle, 011.800.2422.6000. ccessories ∂lash ccessories a W The Good Germans The Hemmerles, Munich’s first family of jewelry, design baubles that are truly one of a kind. Photographs by S t e f a n K o r t e t’s not every client request that 230 pieces of haute joaillerie each year in its inspires a designer to branch off into a 12-artisan Munich workshop, is renowned direction he never before imagined— for its austere architectural settings ren- I and subsequently to develop an entirely dered in unorthodox materials including new style in doing so. But that’s exactly how copper, stainless steel, brass, aluminum and the German jewelry house Hemmerle came rare woods, and for its use of exquisitely to enjoy its current status as one of today’s cut colored gemstones. The heaviness of most inventive and sought-after jewelers. a masculine charcoal-hued iron band, for It all began in 1995, when a prominent instance, only enhances the sharp angles of Munich art collector commissioned Ste- an emerald-cut 40-carat electric blue aqua- fan Hemmerle, a third-generation jeweler, marine ring, while the warm hues of orange to create a birthday present for his wife, a and red patinated copper perfectly com- woman who detested flashy gems. -
CHARON KRANSEN ARTS 817 WEST END AVENUE NEW YORK NY 10025 USA PHONE: 212 627 5073 FAX: 212 663 9026 EMAIL: [email protected]
CHARON KRANSEN ARTS 817 WEST END AVENUE NEW YORK NY 10025 USA PHONE: 212 627 5073 FAX: 212 663 9026 EMAIL: [email protected] www.charonkransenarts.com AUGUST. 2020 A JEWELER’S GUIDE TO APPRENTICESHIPS: HOW TO CREATE EFFECTIVE PROGRAMS suitable for shop owners, students as well as instructors, the 208 page volume provides detailed, proven approaches for finding , training and retaining valuable employees. it features insights into all aspects of setting up an apprenticeship program, from preparing a shop and choosing the best candidates to training the apprentice in a variety of common shop procedures. an mjsa publication. $ 29.50 ABSOLUTE BEAUTY – 2007catalog of the silver competition in legnica poland, with international participants. the gallery has specialized for 30 years in promoting contemporary jewelry. 118 pages. full color. in english. $ 30.00 ADDENDA 2 1999- catalog of the international art symposium in norway in 1999 in which invited international jewelers worked with jewelry as an art object related to the body. in english. 58 pages. full color. $ 20.00 ADORN – NEW JEWELLERY - this showcase of new jewelry offers a global view of exciting work from nearly 200 cutting-edge jewelry designers. it highlights the diverse forms that contemporary jewelry takes, from simple rings to elaborate body jewelry that blurs the boundaries between art and adornment. 460 color illustrations. 272 pages. in english. $ 35.00 ADORNED – TRADITIONAL JEWELRY AND BODY DECORATION FROM AUSTRALIA AND THE PACIFIC adorned draws on the internationally recognised ethnographic collection of the macleay museum at the university of sidney and the collections of individual members of the oceanic art society of australia. -
To Read the Newsletter Sample
American Society of Jhistoriansewelry newsletter vol. 31, no. 1, spring/summer 2017 A Letter from the President Dear ASJH Member: COVER: Necklace, 1929. Pro- The jewelry world is populated with fascinating, compelling, and unforget- duced by Van Cleef & Arpels (Paris, France). Platinum, carved table individuals, many of whom have been industry mentors and leaders. It is rubies, diamonds; l. 41.3 cm. The with great sadness that we inform you of several deaths that have taken place Adrien Labi Collection. Photo: Siegelson, New York. recently: those of Liana Paredes, Kenneth Jay Lane, Daphne Farago, and Fred Leighton. OPPOSITE: “Giraffe” Necklaces and Bracelets, ca. 1927. Designed Ms. Paredes was the chief curator and director of collections at Hillwood by Jean Dunand (French, b. Estate, Museum, and Gardens, the famed museum in Maryland founded by Switzerland, 1877–1942). Red and black lacquer, Oréum; necklaces: Marjorie Merriweather Post. She was a highly esteemed expert on French diam. 11.4–14.6 cm; bracelets: decorative arts and interiors and was both author and co author of numerous diam. 6–7 cm. Siegelson, New York. works on porcelain and collectibles, including Sevres Then And Now: Tradition in Porcelain 1750–2000 and A Taste for Splendor: Russian Imperial and European Treasures from the Hillwood Museum. After organizing and curating numerous decorative arts exhibits, she moved onto what was to become one of her favorite endeavors: researching and curating the magnificent exhibit of Marjorie Merriweather Post’s jewels, Spectacular Gems and Jewelry, on view at Hillwood until January of 2018. She was a historian and a lover of beautiful objects, with a deep under- standing of aesthetics and workmanship. -
Crystal Structure of Triclinic Lazurite V
Crystallography Reports, Vol. 42, No.6, 1997, pp. 938-945. Translatedfrom Kristallograftya, Vol. 42, No.6, 1997, pp. 1014-1021. Original Russian Text Copyright@ 1997 by Evsyunin, Sapozhnikov, Kashaev, Rastsvetaeva. Crystal Structure of Triclinic Lazurite v. G. Evsyunin*, A. N. Sapozhnikov**, A. A. Kashaev***, and R. K. Rastsvetaeva**** Institute of the Earth's Crust, Siberian Division, Russian Academy of Sciences, * ul. Lermontova 128, Irkutsk, 664033 Russia Vinogradov Institute of Geochemistry and Analytical Chemistry, Siberian Division, ** Russian Academy of Sciences, ul. Favorskogo la, Irkutsk, 664033 Russia Irkutsk Pedagogical Institute, Irkutsk, 664033 Russia *** Shubnikov Institute of Crystallography, Russian Academy of Sciences, **** Leninskii pro 59, Moscow, 117333 Russia Received November 11, 1996 Abstract-The structure of triclinic lazurite from the Malaya-Bystraya deposit (Southern Baikal area) has been determined (sp. gr. PI, Rhkl =0.061,5724 reflections, 210 crystallographically nonequivalent atoms). The form of the incorporation of a sulfur atom into the structure and the character of the displacement and substitution modulations of all the structure atoms have also been determined. INTRODUCTION S04-groups have two orientations that differ by a 90°_ The mineral lazurite has been known in Europe rotation about the fourfold axis. Thus, the form of the since the late 13th century. Since then, it has attracted incorporation of S atoms into the structure and the widespread attention, in particular, as a valuable orna- interpretation of the specific features of this structure mental color stone and as a source of high-quality blue reflected in the presence of superstructural reflections pigment. Being related to the sodalite group, lazurite on the diffraction patterns of lazurite stimulate the fur- has been known for quite a long time as a cubic min- ther structural study of this mineral. -
Aerin Lauder
FEBRUARY 2020 AMERICA’S LEAST BORING BILLIONAIRES The STRANGE CASE of the VA NISHING PRINCESSES T&C’s FANCY SAFARI Guide HOW NOT TO RAISE A BRAT WELR JE Y TheThe RightRight WayWay toto SpendSpend YourYour Bonus!Bonus! A S W A R D Aine Jewelsrin that L Madeau Historyder JEWELRY AND THE MOB RIHANNA AND THE RENAISSANCE A DIAMOND TROUSSEAU THE T&C Jewelry AWA R D S The new masters and reigning champions who marked the year in jewels. The Major FROM TOP ANAKHOURI DIAMOND Breakthrough AND EMERALD EVA NECKLACE $461,000 ANA KHOURI HIGH JEWELRY DIAMOND AND PARAIBA TOURMALINE PHILLIPA NECKLACE $824,000, ANAKHOURI.COM It was the diamond and Paraiba tourmaline torque du jour of Paris Couture! The Brazilian designer Ana Khouri had already established herself as a skilled sculptor of metal and stones with ear cus and a Mirian semicircle ring that have become modern classics, but the Harmony High Jewelry Collection of diamonds and rare stones she showed this year at the Musée des Arts Décoratifs signaled the evolution of a rising talent into a celebrated DON PENNY, STYLED BY MIAKO KATOH MIAKO BY STYLED DON PENNY, member of the establishment. The ultimate getting-ready selfie: a white bathrobe and a 128-carat The Red Carpet diamond. Appearance LADY GAGA IN THE TIFFANY DIAMOND Was it the most expensive jewel ever worn to the Academy Awards? Worth a reported $30 million, it’s likely that Lady Gaga’s Tif- fany diamond necklace claims that title. (The previous record was held by Titanic actress Gloria Stuart’s $20 million Harry Winston blue diamond, inspired by the movie’s Heart of the Ocean.) But that was actually not why this particular diamond necklace sent jewelry experts into a frenzy on Oscar night. -
Stability of the Modulated Structure of Baœkal Lazurite and Its Recrystallization at a Temperature of 600°C Over a Wide Range of Sulfur Dioxide Fugacities V
Crystallography Reports, Vol. 50, Suppl. 1, 2005, pp. S1–S9. Original Russian Text Copyright © 2005 by Tauson, Sapozhnikov. STRUCTURE OF INORGANIC COMPOUNDS Stability of the Modulated Structure of BaÏkal Lazurite and Its Recrystallization at a Temperature of 600°C over a Wide Range of Sulfur Dioxide Fugacities V. L. Tauson and A. N. Sapozhnikov Vinogradov Institute of Geochemistry, Siberian Division, Russian Academy of Sciences, ul. Favorskogo 1a, Irkutsk, 664033 Russia e-mail: [email protected] Received February 8, 2005 Abstract—The stability of three-dimensional incommensurate modulation in cubic lazurite from the BaÏkal region is experimentally investigated at T = 600°C. It is found that the X-ray photoelectron spectra of the annealed samples exhibit a peak corresponding to sulfite and a split peak associated with the (Na,Ca)SO4 sul- fate. It is assumed that the splitting is caused by the ordering of the complexes not involved in the framework. This assumption is confirmed by the presence of a similar split peak in the X-ray photoelectron spectra of tri- clinic lazurite. It is demonstrated that the initial modulation is retained at the fugacity f = 8 × 10–3 bar. The SO2 decisive factors responsible for the retention of the three-dimensional incommensurate modulation are the tem- perature and the fugacity of sulfur dioxide. The latter quantity should be close to the stability boundary of the basic lazurite structure. The growth and transformation mechanisms of the modulation formation are consid- ered. © 2005 Pleiades Publishing, Inc. INTRODUCTION mum concentrations of sulfide sulfur and potassium are typical of the monoclinic modification. -
Download PRIM II Refractive Index Chart
What is Refractive Index (R.I.)? What do the numbers Light travels at different speeds through in the brackets on this chart mean? different types of gemstones due to The numbers in the brackets indicate the Important Note structure of the stone. This affects the tolerance level for readings derived from All testers have been calibrated during the manufacturing process and requires no amount of light refraction and causes the the product. These slight fluctuations further adjustment or user intervention. Self-calibration should not be attempted and is bending of light. The slower the light's indicating a tolerance level are necessary not advised. speed in the material; the greater the due to the optical sensor and electronic REFRACTIVE INDEX CHART FOR bending effect. The refractive index of the components in the product. To minimize any risks associated, users should contact Presidium at gemstone can be defined as the ratio [email protected] or its service center for assistance. PRESIDIUM REFRACTIVE INDEX METER II between the speed of light in vacuum versus the speed of light in gemstone. In the event that users require the manufacturer to re-calibrate the unit, users will have to bear the associated to and fro freight cost for shipping of the unit to the Presidium service center. Presidium Instruments Please note that the gemstone tested on this product must have a flat surface and should Unit 7, 207 Henderson Road Singapore 159550 not be an opaque gemstone. www.presidium.com.sg Family Name of Stones Refractive Index Reading Family -
The Origins of Color in Minerals Four Distinct Physical Theories
American Mineralogist, Volume 63. pages 219-229, 1978 The origins of color in minerals KURT NASSAU Bell Laboratories Murray Hill, New Jersey 07974 Abstract Four formalisms are outlined. Crystal field theory explains the color as well as the fluores- cence in transition-metal-containing minerals such as azurite and ruby. The trap concept, as part of crystal field theory, explains the varying stability of electron and hole color centers with respect to light or heat bleaching, as well as phenomena such as thermoluminescence. The molecular orbital formalism explains the color of charge transfer minerals such as blue sapphire and crocoite involving metals, as well as the nonmetal-involving colors in lazurite, graphite and organically colored minerals. Band theory explains the colors of metallic minerals; the color range black-red-orange- yellow-colorless in minerals such as galena, proustite, greenockite, diamond, as well as the impurity-caused yellow and blue colors in diamond. Lastly, there are the well-known pseudo- chromatic colors explained by physical optics involving dispersion, scattering, interference, and diffraction. Introduction The approach here used is tutorial in nature and references are given for further reading or, in some Four distinct physical theories (formalisms) are instances, for specific examples. Color illustrations of required for complete coverage in the processes by some of the principles involved have been published which intrinsic constituents, impurities, defects, and in an earlier less technical version (Nassau, 1975a). specific structures produce the visual effects we desig- Specific examples are given where the cause of the nate as color. All four are necessary in that each color is reasonably well established, although reinter- provides insights which the others do not when ap- pretations continue to appear even in materials, such plied to specific situations. -
Uncommon Gemstones Are Carving out Their Niche in Fine Jewellery
KNOWLEDGE 18k peridot diamond tassel pendant (left), 18k green garnet diamond tassel pendant (right), CONTINENTAL DIAMOND UNUSUAL GEMSTONES by Preeta Agarwal Uncommon gemstones are carving out their niche in S patial fine jewellery ttraction 90 A FROM TOP Pendant in rose gold set with white and brown diamonds, emeralds, and chrysoprase from the Sissi collection, ur planet has created and yielded an amazing and MORAGLIONE still growing array of gemstones. Yet, only a few were elevated to jewellery stardom, such as diamonds, Diamond earrings with sapphires, emeralds, and rubies. With those shining chrysoprase and pearls, FARAH KHAN Obrightly in the discriminating world of high jewellery, the quest for creative and financial success is motivating jewellery designers Diva high jewellery to explore new materials and gemstone diversity. Chrysoprase, necklace in yellow gold spessartite garnet, peridot, tanzanite, and morganite are starting to and mother of pearl gain attention and are capturing hearts, minds, and wallets with their with 217.94ct rubellites, 184.03ct peridots, delicate appeal and vibrant intensity. and diamond pavé, BULGARI Peridot Amongst all the green gemstones, none is as vibrant as a peridot. After decades of absence, the olive green stone that sparks from within has made a comeback. Initially found on the volcanic island of Zabargad in the Red Sea, off the coast of Egypt, it is now being mined at many other locations across the globe. Bulgari, famed for using diverse precious and semi-precious gemstones together in their high jewellery necklaces, has used peridots against a variety of gemstones like rubies, amethysts, tourmalines, rubelites, garnets, and mother of pearls. -
Origin and Structural Character of Haüyness in Spinel Dunite Xenoliths from La Palma, Canary Islands
American Mineralogist, Volume 85, pages 1397–1405, 2000 Origin and structural character of haüyness in spinel dunite xenoliths from La Palma, Canary Islands ERIK WULFF-PEDERSEN,1,* ELSE-RAGNHILD NEUMANN,2,† ERNST A.J. BURKE,3 RICCARDO VANNUCCI,4 PIERO BOTTAZZI,4 LUISA OTTOLINI,4 JON GJØNNES,5 AND VIDAR HANSEN5 1Mineralogical-Geological Museum, University of Oslo, Sarsgaten 1, N-0562 Oslo, Norway 2Department of Geology, P.O. Box 1047 Blindern, N-0316 Oslo, Norway 3Faculty of Earth Sciences, Vrije Universiteit, De Boelelaan 1085, NL-1081 HV Amsterdam, The Netherlands 4CNR-Centro di Studio per la Cristallochimica e la Cristallografia, via Bassi 4, I-27100 Pavia, Italy 5Center of Material Science, Forskningsparken, Gaustadalleen 21, N-0371 Oslo, Norway ABSTRACT Two spinel dunite xenoliths (Fo89.8–91.2 in olivine) from La Palma contain minor amounts (<1%) of a pale-blue sodalite-group mineral with haüyne/lazurite chemistry. Selected-area electron diffrac- tion (SAED) patterns of this phase indicate a cubic unit cell with dimensions 9.12 ± 0.02 Å, and – space group P43n. Superstructure spots along three <110> directions are common, implying com- mensurate or incommensurate modulations along <110> directions. Raman spectra show peaks typical of both lazurite and haüyne. It is concluded that the mineral has a structure intermediate between those of pure lazurite and pure haüyne, and it is here referred to as haüyness. The haüyness occurs together with strongly nepheline-normative glass in thin veinlets (<0.1 mm), in interstitial glass pockets, and as inclusions in olivine porphyroclasts. To our knowledge lazurite or haüyne has not previously been described in mantle rocks.