{"id":3307,"date":"2016-04-29T11:24:51","date_gmt":"2016-04-29T09:24:51","guid":{"rendered":"http:\/\/www.cookson-clal.com\/le-blog\/?p=3307"},"modified":"2017-04-07T16:06:13","modified_gmt":"2017-04-07T14:06:13","slug":"a-la-decouverte-de-lor","status":"publish","type":"post","link":"https:\/\/www.cookson-clal.com\/le-blog\/a-la-decouverte-de-lor\/","title":{"rendered":"A la d\u00e9couverte de l\u2019or"},"content":{"rendered":"

\"or<\/a><\/p>\n

Depuis la nuit des temps, l\u2019or reste le m\u00e9tal pr\u00e9cieux le plus recherch\u00e9. Au naturel, ce m\u00e9tal \u00e0 la couleur jaune brillant reste le m\u00e9tal le plus noble le plus mall\u00e9able. C\u2019est ainsi qu\u2019on le retrouve depuis toujours comme monnaie d\u2019\u00e9change, \u00e0 travers des pi\u00e8ces de monnaie, des bijoux, des p\u00e9pites d\u2019or etc.<\/strong><\/p>\n

Connu pour sa noblesse l\u00e9gendaire<\/strong>, l\u2019or<\/strong> est un m\u00e9tal qui brille et ne s\u2019oxyde pas de part ses caract\u00e9ristiques. V\u00e9ritable symbole de richesse<\/strong>, l\u2019or<\/strong> est le m\u00e9tal de pr\u00e9dilection dans l\u2019univers joaillier<\/strong>.<\/p>\n

Aujourd\u2019hui, l\u2019or<\/strong> reste per\u00e7u comme le m\u00e9tal le plus pr\u00e9cieux. Aussi rare<\/strong> soit-il, sa valeur est infinie et est connue de toutes les cultures. Son application est multiple, qu\u2019il s\u2019agisse d\u2019\u00e9conomie, de bijoux, ou \u00e0 travers d\u2019industrie diverses. Gr\u00e2ce \u00e0 Cookson-CLAL, partez \u00e0 la d\u00e9couverte de l\u2019or\u2026<\/strong><\/p>\n

 <\/p>\n

Les origines de l\u2019or pur<\/h2>\n

L\u2019or<\/strong> est issu d\u2019une r\u00e9action nucl\u00e9aire produite il y a pr\u00e8s de 12 milliards d\u2019ann\u00e9e. Les explosions et les fusions successives d\u2019\u00e9toiles<\/strong> entres elles auraient abouti \u00e0 la cr\u00e9ation de noyaux d\u2019or<\/strong> concentr\u00e9s dans le noyau de la Terre\u2026 D’apparence inaccessibles, ces noyaux d\u2019or<\/strong> sont, selon les scientifiques, de plus en plus pr\u00e9sents dans la cro\u00fbte terrestre de la Terre<\/strong>. Depuis quelques 4 milliards d\u2019ann\u00e9es, les m\u00e9t\u00e9orites auraient aussi permis l\u2019apparition de p\u00e9pites d\u2019or<\/strong> dans l\u2019\u00e9corce terrestre<\/strong>. Aujourd\u2019hui, l\u2019Homme recherche toujours l\u2019or comme le m\u00e9tal le plus pr\u00e9cieux<\/strong>, le plus rare<\/strong> sur la Terre et donc le plus cher<\/strong>.<\/p>\n

\"p\u00e9pites<\/a>\u00a9 www.leseconoclastes.fr\"lingot<\/a>\u00a9 www.prixdelor.eu<\/p>\n

Les couleurs de l\u2019or<\/h2>\n

L\u2019or<\/strong> est un m\u00e9tal tr\u00e8s particulier<\/strong> au niveau de sa composition chimique. Sa couleur jaune dor\u00e9e<\/strong> poss\u00e8de en effet des reflets complexes, qui lui permet facilement de changer de couleur. Ce m\u00e9tal pr\u00e9cieux est relativement mou<\/strong>, et le m\u00e9lange avec un autre m\u00e9tal plus dense le rend plus facile \u00e0 travailler. Selon le m\u00e9tal choisi et sa proportion, l\u2019or peut \u00eatre gris<\/strong>, blanc, rose, vert ou encore noir.<\/strong><\/p>\n

En joaillerie<\/strong>, le m\u00e9lange d\u2019or<\/strong> avec un autre m\u00e9tal est appel\u00e9 un alliage<\/strong>. Pour augmenter sa rigidit\u00e9, l\u2019or peut \u00eatre facilement m\u00e9lang\u00e9 \u00e0 l\u2019argent ou au cuivre. Mais l\u2019on peut aussi retrouver d\u2019autres m\u00e9taux tels que le platine, le nickel, le zinc ou encore le mangan\u00e8se.<\/strong><\/p>\n

En France, la loi exige qu\u2019il soit fait mention du m\u00e9tal pr\u00e9cieux<\/strong> utilis\u00e9 et de son titre exprim\u00e9 en milli\u00e8me, appel\u00e9 aussi carat<\/strong>.<\/p>\n

En bijouterie<\/strong>, le carat<\/strong> est une mesure de puret\u00e9 des m\u00e9taux pr\u00e9cieux<\/strong>. Dans ce contexte, un carat repr\u00e9sente 1\/24\u00e8me de la masse totale d\u2019un alliage<\/strong>. Par exemple, de l\u2019or \u00e0 15 carats signifie que dans 24g d\u2019alliage, on trouve 15g d\u2019or pur. De l\u2019or 24 carats est de l\u2019or pur.\u00a0Alors qu\u2019en joaillerie<\/strong>, le carat est une unit\u00e9 de masse utilis\u00e9e pour les gemmes (pierres fines, pr\u00e9cieuses ou ornementales<\/strong>).<\/p>\n\n\n\n\n
Carats<\/strong><\/td>\n24<\/td>\n22<\/td>\n20<\/td>\n18<\/td>\n16<\/td>\n14<\/td>\n12<\/td>\n10<\/td>\n8<\/td>\n6<\/td>\n4<\/td>\n2<\/td>\n<\/tr>\n
% or<\/strong><\/td>\n99,9<\/td>\n91,67<\/td>\n83,34<\/td>\n75,01<\/td>\n66,88<\/td>\n58,35<\/td>\n50,02<\/td>\n41,69<\/td>\n33,34<\/td>\n25,01<\/td>\n16,67<\/td>\n8,33<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"tableau<\/p>\n

Pour de l’or 18 carats\u00a0:<\/p>\n

    \n
  • l\u2019or jaune<\/strong>\u00a0est en principe constitu\u00e9 de 75\u00a0% d’or, de 12,5\u00a0% d’argent\u00a0et de 12,5\u00a0% de\u00a0cuivre\u00a0;<\/li>\n
  • l\u2019or rose<\/strong>\u00a0est normalement compos\u00e9 de 75\u00a0% d’or, de 20\u00a0% de cuivre et de 5\u00a0% d’argent\u00a0;<\/li>\n
  • l\u2019or gris\u00a0<\/strong>comporte habituellement 75\u00a0% d’or, de l’argent et parfois du palladium\u00a0;<\/li>\n
  • l’or blanc<\/strong>\u00a0de joaillerie est un terme souvent utilis\u00e9 pour parler de l’or gris. L’or blanc\u00a0est donc recouvert d’une fine couche de\u00a0rhodium\u00a0(or \u00ab\u00a0rhodi\u00e9\u00a0\u00bb), qui dispara\u00eet avec le temps, redonnant une couleur gris-jaune \u00e0 l’or.<\/li>\n
  • l’or bleu\u00a0<\/strong>est un alliage d’or et de\u00a0fer. Un traitement thermique oxyde les atomes de fer \u00e0 la surface du m\u00e9tal et lui donne sa\u00a0couleur azur.<\/li>\n
  • L\u2019or saumon\u00a0<\/strong>: m\u00e9lange d\u2019or et de platine (saumon),<\/li>\n
  • L\u2019or jaun\u00e2tre\u00a0<\/strong>(jaune-vert) : m\u00e9lange d\u2019or et de zinc<\/li>\n
  • L\u2019or vert\u00a0<\/strong>: m\u00e9lange d\u2019or, d\u2019argent et de cadmium,<\/li>\n
  • L\u2019or violet<\/strong>\u00a0: m\u00e9lange d\u2019or et d\u2019aluminium<\/li>\n
  • l’or noir<\/strong>\u00a0est constitu\u00e9 d’or blanc recouvert d’une couche de\u00a0ruth\u00e9nium\u00a0ou de\u00a0rhodium<\/li>\n<\/ul>\n
    \"\u00a9

    \u00a9 www.vivalatina.fr<\/p><\/div>\n

    L\u2019or aujourd\u2019hui<\/h2>\n

    L\u2019or<\/strong> reste aujourd\u2019hui encore le m\u00e9tal le plus recherch\u00e9<\/strong> et le plus rare<\/strong>. Les monnaies du monde entier ont utilis\u00e9 l\u2019or comme monnaie d\u2019\u00e9change principale\u00a0: le Louis d\u2019Or, le Dollar, le Lingot\u2026 Les banques centrales et les bourses mondiales New York, Londres ou encore Tokyo utilisent l\u2019or comme valeur de transaction.<\/strong><\/p>\n

    En plus d\u2019un r\u00f4le \u00e9conomique \u00e9vident, l\u2019or<\/strong> conserve aujourd\u2019hui un r\u00f4le important dans les activit\u00e9s artistiques<\/strong>. A titre d\u2019exemple\u00a0: les m\u00e9dailles, les bijoux, les dorures, les d\u00e9cors alimentaires.<\/strong><\/p>\n

    L\u2019or<\/strong> est \u00e9galement fortement pr\u00e9sent dans les industries\u00a0<\/strong>: m\u00e9dicale, automobile, informatique, a\u00e9rospatiale, \u00e9lectronique et \u00e9lectricit\u00e9.<\/p>\n

     <\/p>\n

     <\/p>\n

    \"\u00a9

    \u00a9 www.behance.net<\/p><\/div>\n

    \"bague_homme_en_or_noir\"

    \u00a9 www.frontjewelers.net<\/p><\/div>\n

     <\/p>\n

     <\/p>\n

    Vous l\u2019avez compris, de tous temps, l\u2019or est rest\u00e9 pr\u00e9sent \u00e0 travers les cultures et les usages pour repr\u00e9senter l\u2019authenticit\u00e9, la richesse et la noblesse.<\/strong><\/p>\n

    Cookson-CLAL permet \u00e0 tous les professionnels de la bijouterie de faire vivre une part de r\u00eave en achetant ces mati\u00e8res premi\u00e8res nobles, utilisables pour toutes les cr\u00e9ations.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

    Depuis la nuit des temps, l\u2019or reste le m\u00e9tal pr\u00e9cieux le plus recherch\u00e9. Au naturel, ce m\u00e9tal \u00e0 la couleur jaune brillant reste le m\u00e9tal le plus noble le plus…<\/p>\n","protected":false},"author":5,"featured_media":3308,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[262,246],"tags":[],"yoast_head":"\r\nA la d\u00e9couverte de l\u2019or | L'atelier - Le blog des cr\u00e9ateurs de bijoux Cookson CLAL<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.cookson-clal.com\/le-blog\/a-la-decouverte-de-lor\/\" \/>\r\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"A la d\u00e9couverte de l\u2019or | L'atelier - Le blog des cr\u00e9ateurs de bijoux Cookson CLAL\" \/>\r\n<meta property=\"og:description\" content=\"Depuis la nuit des temps, l\u2019or reste le m\u00e9tal pr\u00e9cieux le plus recherch\u00e9. 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