{"id":6825,"date":"2026-05-12T15:39:12","date_gmt":"2026-05-12T15:39:12","guid":{"rendered":"https:\/\/blog.ccopera.com\/metaux\/?p=6825"},"modified":"2026-05-12T15:39:13","modified_gmt":"2026-05-12T15:39:13","slug":"bijoux-en-or-carat-vs-karat","status":"publish","type":"post","link":"https:\/\/blog.ccopera.com\/metaux\/bijoux-en-or-carat-vs-karat-6825","title":{"rendered":"Bijoux en or :  carat vs karat"},"content":{"rendered":"\n<p>Carat vs karat : Le karat (k) est l\u2019unit\u00e9 utilis\u00e9e pour mesurer la quantit\u00e9 d\u2019or pur pr\u00e9sente dans un bijou ou un objet en or. L\u2019or pur correspond \u00e0 24 karats. Plus le nombre de karats est faible, plus l\u2019or est alli\u00e9 \u00e0 d\u2019autres m\u00e9taux comme le cuivre ou l\u2019argent afin de renforcer sa r\u00e9sistance. Ainsi, un or \u00e0 fort titrage est plus pur et g\u00e9n\u00e9ralement plus pr\u00e9cieux.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">D\u2019o\u00f9 vient le terme \u00ab karat \u00bb ?<\/h2>\n\n\n\n<p>Le mot \u00ab karat \u00bb remonte \u00e0 l\u2019Antiquit\u00e9. Il d\u00e9rive du terme grec&nbsp;<em>ker\u00e1tion<\/em>, qui d\u00e9signait la graine du caroubier. Ces graines servaient autrefois d\u2019unit\u00e9 de poids gr\u00e2ce \u00e0 leur masse r\u00e9put\u00e9e r\u00e9guli\u00e8re.<\/p>\n\n\n\n<p>Avec le d\u00e9veloppement du commerce des m\u00e9taux pr\u00e9cieux et des pierres, cette mesure a progressivement \u00e9volu\u00e9 pour devenir le syst\u00e8me actuel de puret\u00e9 de l\u2019or bas\u00e9 sur une \u00e9chelle de 24 parts.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Karat et carat : deux notions diff\u00e9rentes<\/h3>\n\n\n\n<p>Ces deux mots sont souvent confondus, pourtant ils d\u00e9signent des choses bien distinctes :<\/p>\n\n\n\n<ul>\n<li><strong>Karat (k)<\/strong>&nbsp;: mesure la puret\u00e9 de l\u2019or<\/li>\n\n\n\n<li><strong>Carat (ct)<\/strong>&nbsp;: mesure le poids des pierres pr\u00e9cieuses, notamment des diamants<\/li>\n\n\n\n<li><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi le nombre de karats est-il important ?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-5d1f15c4bfe8b9b7468719e35379df15\">Une influence directe sur la valeur<\/h3>\n\n\n\n<p>La valeur d\u2019un bijou d\u00e9pend fortement de sa teneur en or pur. \u00c0 poids identique, un bijou en 18k aura une valeur sup\u00e9rieure \u00e0 un bijou en 9k.<\/p>\n\n\n\n<p>Prenons cet exemple de collier : il est en 18 karats et p\u00e8se 51 grammes. Au cours de rachat d&rsquo;aujourd&rsquo;hui, 12 mai 2026, le calcul sera le suivant : 51gr x 83,05 = 4235,55 euros.<\/p>\n\n\n\n<p>Si la m\u00eame cha\u00eene avait \u00e9t\u00e9 en 20 karats, nous l&rsquo;aurions rachet\u00e9 5105,61 euros.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/blog.ccopera.com\/metaux\/wp-content\/uploads\/sites\/5\/2026\/05\/collier-768x1024.jpeg\" alt=\"Collier en or 18k\n\" class=\"wp-image-6828\" style=\"width:236px;height:auto\" srcset=\"https:\/\/blog.ccopera.com\/metaux\/wp-content\/uploads\/sites\/5\/2026\/05\/collier-768x1024.jpeg 768w, https:\/\/blog.ccopera.com\/metaux\/wp-content\/uploads\/sites\/5\/2026\/05\/collier-225x300.jpeg 225w, https:\/\/blog.ccopera.com\/metaux\/wp-content\/uploads\/sites\/5\/2026\/05\/collier-1152x1536.jpeg 1152w, https:\/\/blog.ccopera.com\/metaux\/wp-content\/uploads\/sites\/5\/2026\/05\/collier.jpeg 1500w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-59155d5f7cff760d61dc1741734b3ebf\">Un impact sur la r\u00e9sistance<\/h3>\n\n\n\n<p>L\u2019or pur \u00e9tant naturellement tr\u00e8s souple, il est souvent m\u00e9lang\u00e9 \u00e0 d\u2019autres m\u00e9taux pour cr\u00e9er des bijoux plus solides et adapt\u00e9s \u00e0 un usage quotidien. En France, l\u2019or 18k est particuli\u00e8rement appr\u00e9ci\u00e9 pour son bon \u00e9quilibre entre qualit\u00e9 et durabilit\u00e9.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Les principaux types d\u2019or<\/h2>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-afade9e1308eb9cb75bcaa362a066a69\">Or 24 karats<\/h3>\n\n\n\n<p>L\u2019or 24k contient environ 99,9 % d\u2019or pur. Tr\u00e8s pr\u00e9cieux mais aussi tr\u00e8s tendre, il est surtout utilis\u00e9 pour les lingots et certains objets d\u2019investissement.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-80391f2accfcf5b4a61a46d813243206\">Or 18 karats<\/h3>\n\n\n\n<p>Compos\u00e9 de 75 % d\u2019or pur, l\u2019or 18k repr\u00e9sente la r\u00e9f\u00e9rence de la bijouterie fran\u00e7aise gr\u00e2ce \u00e0 son excellent compromis entre prestige et robustesse.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-d47c9b8898bffebfe00b4a980231b6df\">Or 14 karats et 9 karats<\/h3>\n\n\n\n<p>L\u2019or 14k (58,5 % d\u2019or pur) et l\u2019or 9k (37,5 %) sont plus accessibles financi\u00e8rement et souvent plus r\u00e9sistants. En revanche, leur valeur de rachat est g\u00e9n\u00e9ralement inf\u00e9rieure.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Tableau des diff\u00e9rents karats<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Karats<\/th><th>Pourcentage d\u2019or<\/th><th>Utilisation courante<\/th><\/tr><\/thead><tbody><tr><td>24k<\/td><td>99,9 %<\/td><td>Lingots et investissement<\/td><\/tr><tr><td>18k<\/td><td>75 %<\/td><td>Bijoux haut de gamme<\/td><\/tr><tr><td>14k<\/td><td>58,5 %<\/td><td>Bijoux du quotidien<\/td><\/tr><tr><td>9k<\/td><td>37,5 %<\/td><td>Bijoux plus abordables<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Comment reconna\u00eetre le karat d\u2019un bijou ?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-2a18697c39871a3357e31b5feef696fe\">Les poin\u00e7ons officiels<\/h3>\n\n\n\n<p>En France, la majorit\u00e9 des bijoux en or portent un poin\u00e7on garantissant leur teneur en or.<\/p>\n\n\n\n<p>Les poin\u00e7ons les plus fr\u00e9quents sont :<\/p>\n\n\n\n<ul>\n<li>la <strong>T\u00eate d\u2019aigle<\/strong>&nbsp;: or 18k (750 milli\u00e8mes)<\/li>\n\n\n\n<li>le <strong>Tr\u00e8fle ou la coquille<\/strong>&nbsp;: or 9k (375 milli\u00e8mes)<\/li>\n<\/ul>\n\n\n\n<p>Les bijoux import\u00e9s peuvent \u00e9galement pr\u00e9senter des poin\u00e7ons \u00e9trangers.<\/p>\n\n\n\n<p>Ces marques sont souvent discr\u00e8tes : \u00e0 l\u2019int\u00e9rieur d\u2019une bague, sur un fermoir ou au dos d\u2019un pendentif. Une loupe est parfois n\u00e9cessaire pour les distinguer correctement.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"307\" src=\"https:\/\/blog.ccopera.com\/metaux\/wp-content\/uploads\/sites\/5\/2026\/05\/poic\u0327ons-aigle-et-trefle-1-1024x307.png\" alt=\"Les poin\u00e7ons en or : t\u00eate d'aigle 18 karat et trefle 9 karat.\" class=\"wp-image-6829\" srcset=\"https:\/\/blog.ccopera.com\/metaux\/wp-content\/uploads\/sites\/5\/2026\/05\/poic\u0327ons-aigle-et-trefle-1-1024x307.png 1024w, https:\/\/blog.ccopera.com\/metaux\/wp-content\/uploads\/sites\/5\/2026\/05\/poic\u0327ons-aigle-et-trefle-1-300x90.png 300w, https:\/\/blog.ccopera.com\/metaux\/wp-content\/uploads\/sites\/5\/2026\/05\/poic\u0327ons-aigle-et-trefle-1-768x230.png 768w, https:\/\/blog.ccopera.com\/metaux\/wp-content\/uploads\/sites\/5\/2026\/05\/poic\u0327ons-aigle-et-trefle-1.png 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-880a8e853d55191a8ef1be5c1d737676\">Comment les reconna\u00eetre soi-m\u00eame ?<\/h3>\n\n\n\n<p>Quelques observations simples permettent d\u2019obtenir une premi\u00e8re indication :<\/p>\n\n\n\n<ul>\n<li>Les inscriptions&nbsp;<strong>750<\/strong>,&nbsp;<strong>585<\/strong>&nbsp;ou&nbsp;<strong>375<\/strong>&nbsp;correspondent respectivement \u00e0 l\u2019or 18k, 14k et 9k<\/li>\n\n\n\n<li>La couleur peut donner un indice : un or tr\u00e8s jaune est souvent plus pur, mais ce crit\u00e8re reste insuffisant \u00e0 lui seul<\/li>\n<\/ul>\n\n\n\n<p>Pour obtenir une \u00e9valuation fiable, l\u2019avis d\u2019un professionnel reste la meilleure solution.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-223086e8d9ef671582ee9159e8c351e7\">Pourquoi faire appel \u00e0 un expert ?<\/h3>\n\n\n\n<p>Certains bijoux anciens, us\u00e9s ou import\u00e9s peuvent avoir un poin\u00e7on effac\u00e9 ou absent. Dans ces situations, seule une <a href=\"https:\/\/blog.ccopera.com\/metaux\/rachat-dor-guide-complet-pour-vendre-son-or-au-meilleur-prix-en-2026-6624\">expertise sp\u00e9cialis\u00e9e<\/a> permet de d\u00e9terminer pr\u00e9cis\u00e9ment la puret\u00e9 r\u00e9elle de l\u2019or.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Karats et rachat d\u2019or<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Le r\u00f4le du karat dans le prix de rachat<\/h3>\n\n\n\n<p>Lors d\u2019un rachat d\u2019or, les professionnels \u00e9valuent avant tout la quantit\u00e9 d\u2019or pur contenue dans le bijou. Trois \u00e9l\u00e9ments influencent le prix :<\/p>\n\n\n\n<ul>\n<li>le poids du bijou<\/li>\n\n\n\n<li>son nombre de karats<\/li>\n\n\n\n<li>le cours de l\u2019or au moment de la vente<\/li>\n<\/ul>\n\n\n\n<p>Le karat est donc essentiel : un bijou en 18k sera toujours mieux valoris\u00e9 qu\u2019un bijou en 9k de m\u00eame poids.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Les erreurs les plus fr\u00e9quentes<\/h2>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-58e3931e046cb22b111339cdd5efe00b\">Croire qu\u2019un or tr\u00e8s brillant est plus pur<\/h3>\n\n\n\n<p>La brillance d\u2019un bijou d\u00e9pend surtout du polissage, de son \u00e9tat et des alliages utilis\u00e9s. Elle ne refl\u00e8te pas forc\u00e9ment la puret\u00e9 de l\u2019or.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-3d823774ea51ab3cedc31a5021be5af8\">Revendre un bijou sans conna\u00eetre son karat<\/h3>\n\n\n\n<p>Vendre un bijou sans v\u00e9rifier sa teneur en or peut conduire \u00e0 une mauvaise estimation de sa valeur. Il est pr\u00e9f\u00e9rable de contr\u00f4ler les poin\u00e7ons ou de demander une expertise avant toute transaction.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-64c7f3adfe6e1c85bf82a24e570d16e8\">Juger uniquement \u00e0 la couleur<\/h3>\n\n\n\n<p>L\u2019or peut \u00eatre jaune, blanc ou rose selon les m\u00e9taux ajout\u00e9s dans l\u2019alliage. Deux bijoux de couleurs diff\u00e9rentes peuvent pourtant avoir exactement la m\u00eame puret\u00e9. La couleur seule ne permet donc jamais de d\u00e9terminer le nombre de karats.<\/p>\n\n\n\n<p>Vous avez des bijoux et vous souhaitez une expertise ?<\/p>\n\n\n\n<p>Rendez-vous \u00e0  vous rendre \u00e0 notre <a href=\"https:\/\/www.ccopera.com\/metaux-precieux\/rachat\/or\/prix.html\">agence <\/a>au 9 rue Scribe &#8211; 75009 Paris;<\/p>\n\n\n\n<p>Vous ne pouvez vous d\u00e9placez ? profitez de notre service \u00ab\u00a0<a href=\"https:\/\/kolidor.fr\/\">Kolidor.fr<\/a>\u00a0\u00bb et envoyez-nous vos bijoux !<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Carat vs karat : Le karat (k) est l\u2019unit\u00e9 utilis\u00e9e pour mesurer la quantit\u00e9 d\u2019or pur pr\u00e9sente dans un bijou ou un objet en or. L\u2019or pur correspond \u00e0 24 karats. Plus le nombre de karats est faible, plus l\u2019or est alli\u00e9 \u00e0 d\u2019autres m\u00e9taux comme le cuivre ou l\u2019argent afin de renforcer sa r\u00e9sistance. [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":6829,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Bijoux en or : carat vs karat - Blog m\u00e9taux<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez la diff\u00e9rence entre carat vs karat pour vos bijoux en or. 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