{"id":563,"date":"2014-04-29T05:26:11","date_gmt":"2014-04-29T03:26:11","guid":{"rendered":"http:\/\/www.cookson-clal.com\/le-blog\/?p=563"},"modified":"2019-07-01T16:45:53","modified_gmt":"2019-07-01T14:45:53","slug":"decouverte-lor","status":"publish","type":"post","link":"https:\/\/www.cookson-clal.com\/le-blog\/decouverte-lor\/","title":{"rendered":"A la d\u00e9couverte de l&rsquo;Or"},"content":{"rendered":"<p><a href=\"http:\/\/www.cookson-clal.com\/le-blog\/wp-content\/uploads\/2014\/04\/HEB_050__LG.jpg\" data-rel=\"lightbox-image-0\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-thumbnail wp-image-565\" src=\"http:\/\/www.cookson-clal.com\/le-blog\/wp-content\/uploads\/2014\/04\/HEB_050__LG-150x150.jpg\" alt=\"Or - Cookson\" width=\"150\" height=\"150\" srcset=\"https:\/\/www.cookson-clal.com\/le-blog\/wp-content\/uploads\/2014\/04\/HEB_050__LG-150x150.jpg 150w, https:\/\/www.cookson-clal.com\/le-blog\/wp-content\/uploads\/2014\/04\/HEB_050__LG-55x55.jpg 55w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a>Quel point commun peut-il y avoir entre le masque de Tout\u00e2nkhamon, le conquistador Hern\u00e0n Cort\u00e9s et les accords de Bretton Woods ? Vous donnez votre langue au chat ? Bon, allez, on va vous aider : c\u2019est beau, dor\u00e9 et \u00e7a fait tourner les t\u00eates\u2026 L\u2019or bien s\u00fbr !<!--more--><\/p>\n<p>Mais d\u2019o\u00f9 provient-il vraiment ? L\u2019or est issu de la nucl\u00e9osynth\u00e8se stellaire r\u00e9alis\u00e9e par des g\u00e9n\u00e9rations successives d\u2019\u00e9toiles depuis une douzaine de milliards d\u2019ann\u00e9es.<\/p>\n<p>L\u2019or pr\u00e9sent dans la cro\u00fbte terrestre proviendrait donc du grand<br \/>\nbombardement qui aurait eu lieu sur notre plan\u00e8te il y a plus de 3 milliards d\u2019ann\u00e9es.<\/p>\n<p>Ce m\u00e9tal pr\u00e9cieux a depuis toujours jou\u00e9 un r\u00f4le majeur dans l\u2019histoire des civilisations en devenant notamment l\u2019\u00e9talon des \u00e9changes mon\u00e9taires internationaux (\u00e0 partir de 1770) et la valeur principale des anciennes \u00e9conomies (les premi\u00e8res pi\u00e8ces d\u2019or utilis\u00e9es datent de -600 avant JC). Mais l\u2019or aura \u00e9galement permis la cr\u00e9ation d\u2019oeuvres artistiques sans \u00e9gal et restera \u00e0 jamais le m\u00e9tal le plus recherch\u00e9 pour la confection de pi\u00e8ces d\u2019exception.<\/p>\n<p>Connu pour sa noblesse l\u00e9gendaire, l\u2019or est un m\u00e9tal qui brille et ne s\u2019oxyde pas de part ses caract\u00e9ristiques.V\u00e9ritable symbole de richesse depuis la nuit des temps, l\u2019or est le m\u00e9tal de pr\u00e9dilection dans l\u2019univers joaillier.<\/p>\n<p>En France, les bijoux ont obligatoirement une teneur en or minimum de 750 pour 1000 (autrefois, la norme \u00e9tait de 18 carats soit 18\/24\u00e8me d\u2019or). Les bijoux en or sont donc compos\u00e9s d\u2019un alliage d\u2019or \u00e0 750 pour mille et d\u2019autres m\u00e9taux \u00e0 250 pour mille. Puisque l\u2019or est un m\u00e9tal assez mou, l\u2019alliage lui permet de gagner en solidit\u00e9 et durabilit\u00e9 dans le temps.<\/p>\n<h2><strong><span style=\"font-size: 12pt;\">La couleur<\/span><\/strong><\/h2>\n<ul>\n<li>L\u2019or jaune : plus de 12,5% d\u2019argent et 12,5% de cuivre. Id\u00e9alement utilis\u00e9 pour composer des parures avec colliers, bracelets, boucles d\u2019oreilles et bagues.<\/li>\n<li>L\u2019or blanc : plus de 15% de palladium et 10% d\u2019argent. Ce m\u00e9tal se r\u00e9v\u00e8le tr\u00e8s dur, r\u00e9sistant et cher, faisant d\u00e9sormais concurrence au platine. L\u2019or blanc reste souvent confondu avec l\u2019or gris.<\/li>\n<li>L\u2019or rose : plus de 20% de cuivre et 5% d\u2019argent. Il s\u2019agit d\u2019une couleur fantaisie tr\u00e8s tendance qui transcende le caract\u00e8re romantique de l\u2019or.<\/li>\n<li>L\u2019or jaune, l\u2019or blanc, et l\u2019or rose symbolisent respectivement la fid\u00e9lit\u00e9, l\u2019amiti\u00e9 et l\u2019amour. Cependant, l\u2019or peut \u00e9galement briller dans diff\u00e9rentes teintes, plus rares encore.<\/li>\n<li>L\u2019or rouge : plus de 25% de cuivre<\/li>\n<li>L\u2019or vert : plus de 25% d\u2019argent<\/li>\n<li>L\u2019or bleu : plus de 25% de fer<\/li>\n<li>L\u2019or violet : plus de 25% d\u2019aluminium<\/li>\n<li>Le plaqu\u00e9 or : les bijoux compos\u00e9s d\u2019un m\u00e9tal quelconque puis recouverts d\u2019une fine couche d\u2019or sont des bijoux \u00ab\u00a0plaqu\u00e9-or\u00a0\u00bb. En France, pour b\u00e9n\u00e9ficier du titre plaqu\u00e9 or, le bijou doit \u00eatre recouvert d\u2019une couche minimum de 3 microm\u00e8tres d\u2019or. Cette fine couche permet au bijou de rester couvert d\u2019or plus de 10 ans malgr\u00e9 l\u2019usure du au port r\u00e9gulier de ce dernier.<\/li>\n<li>Le vermeil : plus confidentiel, les bijoux en vermeil sont compos\u00e9s uniquement d\u2019argent puis recouvert d\u2019une couche de 5 microm\u00e8tres d\u2019\u00e9paisseur de couche d\u2019or. Consid\u00e9r\u00e9 comme un m\u00e9tal pr\u00e9cieux, le vermeil fait \u00e9galement l\u2019objet de r\u00e9glementations douani\u00e8res.<\/li>\n<\/ul>\n<h2><strong><span style=\"font-size: 12pt;\">Carat\u2026 ou Carat ?<\/span><\/strong><\/h2>\n<p>Il ne faut surtout pas confondre carat et carat ? Tout simplement car ce terme poss\u00e8de deux significations selon les domaines dans lequel il est utilis\u00e9.<\/p>\n<p>En bijouterie, le carat est une mesure de puret\u00e9 des m\u00e9taux pr\u00e9cieux. Dans ce contexte, un carat repr\u00e9sente 1\/24\u00e8me de la masse totale d\u2019un alliage. 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.<\/p>\n<table style=\"border-collapse: collapse;\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td style=\"width: 28px; height: 13px; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\"><b>Carats<\/b><\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">24<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">22<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">20<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">18<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">16<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">14<\/span><\/p>\n<\/td>\n<td style=\"width: 29px; height: 13px; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">12<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">10<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">8<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">6<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">4<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">2<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 28px; height: 13px; background-color: #efefef; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\"><b>% or<\/b><\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; background-color: #efefef; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">99,9<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; background-color: #efefef; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">91,67<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; background-color: #efefef; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">83,34<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; background-color: #efefef; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">75,01<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; background-color: #efefef; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">66,88<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; background-color: #efefef; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">58,35<\/span><\/p>\n<\/td>\n<td style=\"width: 29px; height: 13px; background-color: #efefef; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">50,02<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; background-color: #efefef; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">41,69<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; background-color: #efefef; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">33,34<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; background-color: #efefef; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">25,01<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; background-color: #efefef; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">16,67<\/span><\/p>\n<\/td>\n<td style=\"width: 28px; height: 13px; background-color: #efefef; border: 1px solid #000000; padding: 4px;\" valign=\"top\">\n<p style=\"margin: 0px; text-align: center;\" align=\"center\"><span style=\"letter-spacing: 0px; font-size: 9px; font-family: Helvetica; color: #000000;\">8,33<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div>\n<p>Alors qu\u2019en joaillerie, le carat est une unit\u00e9 de masse utilis\u00e9e pour les gemmes (pierres fines, pr\u00e9cieuses ou ornementales).<\/p>\n<p>Sources (Wikip\u00e9dia \/ <a href=\"http:\/\/madeinjoaillerie.fr\" target=\"_blank\" rel=\"noopener noreferrer\">madeinjoaillerie.fr<\/a>)<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Quel point commun peut-il y avoir entre le masque de Tout\u00e2nkhamon, le conquistador Hern\u00e0n Cort\u00e9s et les accords de Bretton Woods ? Vous donnez votre langue au chat ? Bon,&#8230;<\/p>\n","protected":false},"author":3,"featured_media":565,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[262,246],"tags":[54,33,53],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>A la d\u00e9couverte de l&#039;Or | L&#039;atelier - Le blog des cr\u00e9ateurs de bijoux Cookson CLAL<\/title>\r\n<meta name=\"description\" content=\"Quel point commun peut-il y avoir entre le masque de Tout\u00e2nkhamon, le conquistador Hern\u00e0n Cort\u00e9s et les accords de Bretton Woods ? Vous donnez votre langue au chat ? 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