African Chrysoprase 6Mm Rondel

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African Chrysoprase 6mm Rondel Amazonite 6mm Rondel Black Rutile 7mm Rondel Black Spinel 3.5mm Rondel plus Mini Clover Blue Appatite 5mm Rondel plus Mini Clover Blue Kyanite 5mm Rondel Blue Opal 5mm Rondel Blue Sapphire 3.5mm Rondel Blue Sapphire 5mm Chrysoprase 4mm Rondel plus Mixed Stone Stations Cluster Rope - Seed Beads - Green Cluster Rope - Seed Beads - Mixed Colors on Rhodium Cluster Rope - Seed Beads - Mixed Colors Cluster Rope - Seed Beads - White Coated Mystic Labradorite 9.5x13mm Oval Dyed Coral Hollolite 4mm Rondel Dyed Teal Turquoise 4mm - Black Finsih Dyed Turquoise Howlite 3.5mm Rondel Fresh Water Pearl 4mm Fresh Water Pearl 5mm Average Garnet 5.5mm Rondel plus Clover Green Amethyst 6mm Square Labradorite 3.5mm Rondel Black Finsih Labradorite 3.5mm Rondel plus Polished Oval Labradorite 4mm Rondel plus Mini Clover Labradorite 4mm Rondel Labradorite Stations Connected Lapis 6.5mm Rondel plus Clover Lapis 6mm Square London Blue Topaz 6.5mm Rondel Mixed Stone 3.5mm Rondel Mixed Stone Rondel plus Pear Shaped Hydroquartz Moss Aqua 3.5mm Rondel - Black Finish Moss Aqua 3.5mm Rondel plus Mini Clover Mother of Pearl 9mm Cushion Cut Mother of Pearl 20mm Coin Station plus Chain Multi Moonstone 7mm Square Multi Sapphire Ovals Multi Tourmaline 4.5mm Rondel Multi Tourmaline Pear Shape Multi Tourmaline Small Ovals Multistone Rondel 3.5mm - Black FInish Mystic Black Spinel 6mm Mystic Garnet 6.5mm Rondel Mystic Labradorite 4mm plus Mini Clover Mystic Labradorite 4mm Rondel Mystic Labradorite 7.5mm Coin Mystic Labradorite 8.5mm Coin - Black Finish Mystic Sunstone 5.5mm Rondel Neon Blue Apatite 5mm Square Peru Opal 8mm Potato Pearl Black Finish Pyrite - Gold plus Natural Mixed Rondel Pyrite 4mm plus Mini Clover Pyrite Coded Black 4mm plus Mini Clover Black FInish Rainbow Moonstone 3.5mm Rondel - Rhodium FInish Rainbow Moonstone 4mm plus Mini Clover Rainbow Moonstone 5mm Square Rainbow Moonstone 6.5mm Rondel Rainbow Moonstone 6mm Rondel Black Finish Rainbow Moonstone 11mm Coin Station plus Chain Rainbow Moonstone 19mm by 12mm Coin Rainbow Moonstone Faceted Rectangles Rainbow Moonstone Oval 8.5mm/10.5mm Rose Quartz 5mm Round Pearl 4mm plus Clover Round Pearl 5mm plus Clover Ruby - Mixed Shades - 4mm Rondel Ruby 4.5mm Rondel plus Clover Ruby 4mm plus Clover Rutila Quartz Stations plus Chain Sapphire Pink and Green 5.5mm Rondel plus Clover Sapphire Pink and Green Polished 6mm Rondel Sky Blue Topaz 5.5mm Uneven Coin - Black Finish Turqouise 7mm Coin Turquoise 5.5mm Rondel Turquoise Flat Pear Shape Vesuvianite (green garet) Rectangles Viva Pearl.

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Gem-Quality Chrysoprase from Haneti-Itiso Area, Central Tanzania
GEM-QUALITY CHRYSOPRASE FROM HANETI-ITISO AREA, CENTRAL TANZANIA KARI A. KINNUNEN and ELIAS J. MALISA KINNUNEN, KARI A. and MALISA ELIAS J., 1990: Gem-quality Chrysoprase from Haneti-Itiso area, Central Tanzania. Bull. Geol. Soc. Finland 62, Part 2, 157—166. Gem-quality, apple-green, Ni-bearing chalcedonic quartz occurs as near-surface veins in silicified serpentinite in the Haneti-Itiso area, Central Tanzania. AAS de- terminations revealed a high Ni content, 0.55 wt.%, and low Co and Cr contents of 120 and 1 ppm respectively. NAA determination revealed near chondritic REE contents. X-ray diffraction determinations showed that the Chrysoprase consists main- ly of alpha quartz with some opal-CT. The gemmological properties are: refractive indices from 1.548 to 1.553 (±0.002), mean specific gravity 2.56, hardness about 7 on Moh's scale, inert to ultraviolet radiation, green through Chelsea filter, and absorption in the deep red and violet part of the optical absorption spectrum. The results confirm the identity of the material as Chrysoprase. Microscopically the Tanzanian Chrysoprase consists of spherules which are high- ly disordered, concentric, and composed of bipyramidal quartz, chalcedony, quart- zine, and opal-A. They were classified into four main types according to the shell arrangement. The diameter of the spherules ranged from 40 um to 77 um. Fluid inclusion types in the bipyramidal quartz were monophasic, low-temperature type. The spherules, silica types and REE contents suggest that this Chrysoprase was deposited by evaporation of surface waters connected with the silicification of the serpentinites. Genetically analogous formations, common in Africa, include M-fabric type, weathering profile silcretes.
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G EMS & G VOLUME XLV WINTER 2009 EMOLOGY W INTER 2009 P AGES 235–312 Ruby-Sapphire Review V Nanocut Plasma-Etched Diamonds OLUME Chrysoprase from Tanzania 45 N Demantoid from Italy O. 4 THE QUARTERLY JOURNAL OF THE GEMOLOGICAL INSTITUTE OF AMERICA EXPERTISE THAT SPREADS CONFIDENCE. Because Public Education AROUND THE WORLD AND AROUND THE CLOCK. Happens at the Counter. ISRAEL 5:00 PM GIA launches Retailer Support Kit and website Cutter checks parameters online with GIA Facetware® Cut Estimator. NEW YORK 10:00 AM GIA Master Color Comparison Diamonds conﬁrm color quality of a fancy yellow. CARLSBAD 7:00 AM MUMBAI 7:30 PM Laboratory technicians calibrate Staff gemologist submits new ﬁndings on measurement devices before coated diamonds to GIA global database. the day’s production begins. HONG KONG 10:00 PM Wholesaler views grading results and requests additional services online at My Laboratory. JOHANNESBURG 5:00 PM Diamond graders inscribe a diamond and issue a GIA Diamond Dossier® A $97.00 value, shipping and handling extra. All across the planet, GIA labs and gemological reports are creating a common language for accurate, unbiased gemstone GIA’s Retailer Support Kit has been developed to help evaluation. From convenient locations in major gem centers, to frontline detection of emerging treatments and synthetics, to online services that include ordering, tracking, and report previews — GIA is pioneering the technology, tools and talent sales associates educate the public about diamonds, that not only ensure expert service, but also advance the public trust in gems and jewelry worldwide. the 4Cs, and thoroughly explain a GIA grading report.
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Guide to Healing Uses of Crystals & Minerals Addiction- Iolite, amethyst, hematite, blue chalcedony, staurolite. Attraction – Lodestone, cinnabar, tangerine quartz, jasper, glass opal, silver topaz. Connection with Animals – Leopard skin Jasper, Dalmatian jasper, silver topaz, green tourmaline, stilbite, rainforest jasper. Calming – Aqua aura quartz, rose quartz, amazonite, blue lace agate, smokey quartz, snowflake obsidian, aqua blue obsidian, blue quartz, blizzard stone, blood stone, agate, amethyst, malachite, pink tourmaline, selenite, mangano calcite, aquamarine, blue kyanite, white howlite, magnesite, tiger eye, turquonite, tangerine quartz, jasper, bismuth, glass opal, blue onyx, larimar, charoite, leopard skin jasper, pink opal, lithium quartz, rutilated quartz, tiger iron. Career Success – Aqua aura quartz, ametrine, bloodstone, carnelian, chrysoprase, cinnabar, citrine, green aventurine, fuchsite, green tourmaline, glass opal, silver topaz, tiger iron. Communication – Apatite, aqua aura quartz, blizzard stone, blue calcite, blue kyanite, blue quartz, green quartz, larimar, moss agate, opalite, pink tourmaline, smokey quartz, silver topaz, septarian, rainforest jasper. www.celestialearthminerals.com Creativity – Ametrine, azurite, agatized coral, chiastolite, chrysocolla, black amethyst, carnelian, fluorite, green aventurine, fire agate, moonstone, celestite, black obsidian, sodalite, cat’s eye, larimar, rhodochrosite, magnesite, orange calcite, ruby, pink opal, blue chalcedony, abalone shell, silver topaz, green tourmaline,
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C:\Documents and Settings\Alan Smithee\My Documents\MOTM
@tftrs1//8Lhmdq`knesgdLnmsg9Bgqxrnoq`rd We’re happy to be featuring chrysoprase, the rarest and most valuable of the gem varieties of chalcedony. Our specimens were collected at a recently reopened gemstone mine in Australia’s historic goldfields. Our write-up explains the origin of chrysoprase’s beautiful, apple-green color as well as the fascinating gold- mining history of Western Australia–it was the search for gold that lead to finding chrysoprase! OVERVIEW PHYSICAL PROPERTIES Chemistry: SiO2 Silicon Dioxide, with small amounts of nickel. Class: Silicates Subclass: Tectosilicates Group: Quartz Subgroup: Microcrystalline Quartz (Chalcedony) Crystal System: Hexagonal Crystal Habits: Microcrystalline, occurs in compact form as veins and nodules Color: Green to apple-green, occasionally yellowish-green Luster: Waxy and vitreous to dull Transparency: Translucent to nearly opaque Streak: White Refractive Index: 1.530-1.539 Cleavage: None Fracture: Conchoidal to subconchoidal and irregular, brittle to tough Hardness: Mohs 6.5-7.0 Specific Gravity: 2.58-2.64 Luminescence: None Distinctive Features & Tests: Best field marks are translucency, green color, hardness, and occurrence in nickel-rich environments. Can be confused with green varieties of smithsonite [ZnCO3], prehnite [Ca2Al2Si3O10(OH)2], and jade [jadeite, Na(Al,Fe)Si2O6]. Dana Classification Number: 75.1.3.1 NAME “Chrysoprase,” pronounced KRIH-sah-praze, is derived from the Greek chrysoprasos (chrysos, “gold,” and prason, “leek”), which translates literally as “golden leek.” Although the name was originally used for certain yellow gemstones, chrysoprase now refers exclusively to the green variety of chalcedony. Other names for chrysoprase include “Australian jade,” “Australian imperial jade,” “quartz jade,” “green quartz,” “chrysophrase,” “prase,” “chrysoprasus,” “green hornstone,” and “jadine.” In European mineralogical and gemological literature, chrysoprase appears as crisoprasa and crisoprasio.
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VOLUME XXXII FALL 1996 THE QUARTERLY JOURNAL OF THE GEMOLOGICAL INSTITUTE OF AMERICA - -' ' ii2 -.F..Ã‘[. 1 . :'^ . i':..>ib,:, Q*.,:. ;: ,* ; , ,<, ; . i -..,,,, .t , ,:Ah' f I 8 ., * - + ;.<' , . *- . ' ..1 V ' ,: ' i . , : < , ''; > GEMS&'. ,' :, . , -v ,.. r , . .. + , . , ' . ... ..] . <.^ -..t.*' -( ",i ' . ' . ., ALL^ 996;. ,, -, ,GEb.OLOGy.i~.-..,,,>*- VOLUME 32 NO. 3 1 TABL CON 15 3 EDITORIAL Opening Pandora's Black Box Richard T. Liddicoat, Editor-in-Chief LETTERS FEATURE ARTICLES De Beers Natural versus Synthetic Diamon Verification Instruments Christopher M.Welbourn, Martin Cooper, and Paul M. Spear Introduction to Analyzing Internal Growth Structures: Identification of the Negative d Plane in Natural Ruby Christopher P. Smith Russian Flux-Grown Synthetic Alexandrite Karl Schmetzer, Adolf Peretti, Olaf Medenbach, and Heinz-Jvrgen Bernhardt REGULAR FEATURES pg. 176 1996 Challenge Winners Gem Trade Lab Notes Gem News Book Reviews Gemological Abstracts ABOUT THE COVER: Responding to trade concerns about the possible cominer- cia1 availability of cuttable-quality synthetic diamonds, De Beers researchers in pg. 187 Maidenhead, England, have developed two types of machines-the DiamondSure and the DiamondView-to separate natural from synthetic diamonds. These new instruments are the focus of the lead article in this issue, by Christopher Welbourn, Martin Cooper, and Paul Spear. The natural-diamond rings shown here contain round brilliants weighing a total of 5.19 ct (top), 4.38 ct (left),5.36 ct (bottom), and (right)6.78 ct with a 3.49 ct yellow emerald-cut diamond. Courtesy of Hans D. Krieger, Idar-Obatstein, Germany, Photo 0 Harold &> Erica Van Pelt-Photographers, Los Angeles, CA Color separations for Gems & Gemology are by Effective Graphics, Co~npton,CA.
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