Gemstones Week of 3/2
Gemstones Week of 3/2 1108
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This 3 page Class Notes was uploaded by Caroline Bacevice on Friday March 6, 2015. The Class Notes belongs to 1108 at Ohio State University taught by Loren Babcock in Spring2015. Since its upload, it has received 46 views. For similar materials see Gemstones in Earth Sciences at Ohio State University.
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Date Created: 03/06/15
Gemstones Week of 32 Test examples What is a gem 0 Material that is sufficiently attractive and durable to be used for personal adornment o Desirable for its beauty the key attribute of a gem o Other common attributes include durability rarity fashion and portability o Often cut and polished o enhance its beauty 0 May be naturally occurring or synthesized in a lab History of the Hope DiamondContinued 1792 French Revolution erupted during the reign of Louis XVI and Queen MarieAntoinette o The royal treasury and the Crown Iewels were looted between September 11 and September 17 1792 French Blue disappeared for 20 years By French Law the statue of limitations on wartime crimes was 20 years On September 19 1812 20 years and 2 days after the theft of the French Crown Iewels a London jeweler documented a 455 carat blue diamond in England in the possession of Daniel Eliason a London diamond merchant 0 Memo established Eliason as the new legal owner 0 The diamond was apparently cut from French Blue About 1820 King George IV of England purchased the diamond After George IV s death in 1830 Lord Henry Philip Hope a London banker bought the diamond 0 Hope had the diamond mounted in a medallion Passed through Hope family until 1901 1910 Hope Diamond sold to CH Rosenau then Pierre Cartier Cartier reset the diamond and sold it to Evalyn Walsh McLean for 180000 0 Cartier told McLean that the diamond brought bad luck to anyone who wore it o Apparent origin of the supposed curse it was a sales pitch McLean thought bad luckquot objects brought her good luck McLean added to the legend of the Hope Diamond 0 Wore it frequently allowed others to wear it o Pawned it several times to raise money 1949 two years after McLean s death 0 Harry Winston NY jeweler purchased McLean s jewelry collection I The diamond traveled in an exhibit 1958 Hope Diamond was removed from its setting culet was recut slightly November 1958 Winston donated the Hope Diamond to the Smithsonian Institution USNM as the foundation for a National Gem Collection What causes color in minerals Corundum and beryl important colored gems How do we perceive color Color perceived depends on the light under which an object is viewed 0 Different types of light different color perceptions eg incandescent light vs uorescent light vs ultraviolet light Visible Spectrum ROYGBIV o For gems no indigo Why do gems appear to have colors 0 Colors are perceived when something absorbs some wavelengths from the visible spectrum 0 If atoms in a gem absorb all red light only greenblue light will be transmitted to the eye stone will appear greenblue 0 Black all colors absorbed 0 White or colorless No light is absorbed Causes of colors in Minerals Origin of color can be 0 Chemical 0 Physical 0 Optical Colors Created Chemically Body color color resulting from internal chemical composition Idiochromatic gems SelfColoredquot due to colorcausing elements that are part of the chemical composition 0 Ex Rhodolite garnet Allochromatic gems Other coloredquot due to impurities Fe Mn Cu Ni Co Ti V Cr etc 0 Ex Corundum I lt1 Cr changes a colorless stone to a ruby Oxidation state also affects color 0 In beryl I Fe2 yields blue beryl aquamarine I Fe3 Yellow beryl heliodor I Mn2 Pink Beryl morganite I Mn3 Red beryl bixbite o In allochromatic gems the color can be changed if the oxidation state haschanged I Yellow beryl can be heated in a low oxygen environment reducing ferric iron Fe3 to ferrous iron Fe2 and producing blue beryl
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