{"id":4848,"date":"2026-03-11T14:44:28","date_gmt":"2026-03-11T13:44:28","guid":{"rendered":"https:\/\/www.aucoffre.com\/academie\/?p=4848"},"modified":"2026-05-07T18:09:20","modified_gmt":"2026-05-07T16:09:20","slug":"once-troy-or-definition","status":"publish","type":"post","link":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/","title":{"rendered":"Qu\u2019est-ce qu\u2019une once d\u2019or ou d\u2019argent\u00a0?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Prix de l\u2019once d\u2019or, cours de l\u2019once d\u2019argent, once troy&nbsp;: des termes qui vous sont s\u00fbrement familiers si vous suivez l\u2019actualit\u00e9 des m\u00e9taux pr\u00e9cieux. Mais vous \u00eates-vous d\u00e9j\u00e0 demand\u00e9 ce qu\u2019\u00e9tait une once troy exactement&nbsp;? Et pourquoi cette unit\u00e9 est-elle utilis\u00e9e comme r\u00e9f\u00e9rence internationale pour conna\u00eetre le prix de l\u2019or&nbsp;? L\u2019Acad\u00e9mie vous propose un voyage dans le temps passionnant, aux origines de l\u2019once troy.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ce qu\u2019il faut retenir<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>L\u2019once troy (oz t), unit\u00e9 de r\u00e9f\u00e9rence sur le march\u00e9 international des m\u00e9taux pr\u00e9cieux, correspond \u00e0 31,103 grammes d\u2019or ou d\u2019argent.<\/li>\n\n\n\n<li>Les premi\u00e8res origines de l\u2019once remontent \u00e0 l\u2019Antiquit\u00e9, mais il faut attendre 1828 pour une adoption officielle \u00e0 l\u2019\u00e9chelle mondiale. Toutes les transactions d\u2019or sont d\u00e9sormais bas\u00e9es sur cette unit\u00e9, et il serait bien compliqu\u00e9 d\u2019en changer.<\/li>\n\n\n\n<li>Une th\u00e9orie avance que le nom de l\u2019once troy viendrait de France, plus exactement de la ville de Troyes et des foires des XII<sup>e<\/sup> et XIII<sup>e<\/sup> si\u00e8cles. Pour faciliter le commerce entre les marchands, il fallait une unit\u00e9 universelle, qui aurait donn\u00e9 le poids troy.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">L\u2019once troy et les m\u00e9taux pr\u00e9cieux, une histoire qui dure<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Tout d\u2019abord, quel est le poids d\u2019une once&nbsp;?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Dis Jamy, \u00e7a p\u00e8se combien une once&nbsp;? Il suffit de retenir un nombre et quelques d\u00e9cimales pour briller en soci\u00e9t\u00e9&nbsp;: <strong>une once d\u2019or \u00e9quivaut \u00e0 31,103 grammes<\/strong>. Pour \u00eatre tout \u00e0 fait pr\u00e9cis, il s\u2019agit d\u2019une <strong>once troy, dont le symbole est<\/strong> <strong>oz t<\/strong>.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Attention<\/strong>&nbsp;: \u00e0 ne pas confondre avec une once \u00ab&nbsp;standard&nbsp;\u00bb anglo-saxonne, qui vaut 28,3495 grammes. Seule l\u2019once troy est utilis\u00e9e dans le domaine des m\u00e9taux pr\u00e9cieux.<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">Le prix de l\u2019or est celui d\u2019une once troy<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Aujourd\u2019hui encore, ce sont ces 31,103 grammes qui servent de <strong>r\u00e9f\u00e9rence universelle pour exprimer le prix de l\u2019or<\/strong>. La LBMA, London Bullion Market Association, donne ainsi <a href=\"https:\/\/www.aucoffre.com\/cours-or?utm_source=academie&amp;utm_medium=article\">le cours de l\u2019or<\/a> deux fois par jour pour une once troy de m\u00e9tal. Pas un kilogramme, pas un gramme. Toujours une once troy. Le cours de l\u2019or actuel signifie donc que 31,103 grammes de m\u00e9tal pr\u00e9cieux valent 5&nbsp;209,75 dollars ou 4&nbsp;475,35 euros (selon les chiffres du 11 mars 2026). Et cela vaut aussi pour <a href=\"https:\/\/www.aucoffre.com\/cours-argent?utm_source=academie&amp;utm_medium=article\">le prix de l\u2019argent m\u00e9tal<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00c0 lire aussi&nbsp;sur l\u2019Acad\u00e9mie<\/strong>&nbsp;: <a href=\"https:\/\/www.aucoffre.com\/academie\/quest-ce-que-la-lbma-london-bullion-market-association\/\">Qu\u2019est-ce que la LBMA (London Bullion Market Association) ?<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pourquoi utiliser encore l\u2019once troy pour les m\u00e9taux pr\u00e9cieux&nbsp;?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019Angleterre a d\u00e9finitivement adopt\u00e9 l\u2019once troy en 1527 pour peser les m\u00e9taux pr\u00e9cieux, et les \u00c9tats-Unis en ont fait autant en 1828. C\u2019est \u00e0 partir de ce moment-l\u00e0 que l\u2019once troy a officiellement gagn\u00e9 ses galons de r\u00e9f\u00e9rence internationale. Et pr\u00e8s de deux si\u00e8cles plus tard, l\u2019once troy est toujours l\u00e0&nbsp;!<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pour une premi\u00e8re raison tr\u00e8s simple&nbsp;: <strong>toutes les transactions d\u2019or reposent sur l\u2019once troy, alors d\u00e9cider de changer cette unit\u00e9 serait extr\u00eamement compliqu\u00e9<\/strong>.<\/li>\n\n\n\n<li>L\u2019autre explication&nbsp;: les 31,103&nbsp;grammes de l\u2019once troy repr\u00e9sentent une quantit\u00e9 \u00ab&nbsp;raisonnable&nbsp;\u00bb d\u2019or ou d\u2019argent, ce qui la rend <strong>plus facile \u00e0 \u00e9changer qu\u2019un kilogramme<\/strong>, surtout au vu des prix actuels.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Il existe aussi des pi\u00e8ces d\u2019une once d\u2019or<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Plusieurs pi\u00e8ces d\u2019or embl\u00e9matiques sont bas\u00e9es sur l\u2019once troy et contiennent 31,103 grammes de m\u00e9tal pr\u00e9cieux. On les appelle les pi\u00e8ces \u00ab bullions \u00bb, le terme anglais pour lingots (et les origines de ce mot m\u00e9riteraient elles aussi un petit voyage dans le temps).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Par exemple&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.aucoffre.com\/recherche\/metal-1\/marketing_list-7\/stype-2\/produit?utm_source=academie&amp;utm_medium=article\">Le Krugerrand<\/a>&nbsp;;<\/li>\n\n\n\n<li><a href=\"https:\/\/www.aucoffre.com\/recherche\/metal-1\/marketing_list-14\/stype-183\/produit?utm_source=academie&amp;utm_medium=article\">La Philharmonique de Vienne<\/a>&nbsp;;<\/li>\n\n\n\n<li><a href=\"https:\/\/www.aucoffre.com\/recherche\/metal-1\/marketing_list-16\/stype-17\/stype-152\/produit?utm_source=academie&amp;utm_medium=article\">La Britannia<\/a>&nbsp;;<\/li>\n\n\n\n<li><a href=\"https:\/\/www.aucoffre.com\/recherche\/metal-1\/marketing_list-4\/stype-216\/produit?utm_source=academie&amp;utm_medium=article\">La Vera Valor<\/a>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Le prix de ces pi\u00e8ces est donc proche du cours de l\u2019or, avec des variations en fonction de <a href=\"https:\/\/www.aucoffre.com\/academie\/quest-ce-que-la-prime-dune-piece-dor\/\">leur prime<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pour en savoir plus<\/strong> : <a href=\"https:\/\/www.aucoffre.com\/academie\/pieces-bullions-or-investissement\/\">lire notre article sur les pi\u00e8ces \u00ab bullions \u00bb en or, en argent ou en platine<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Aux origines de l\u2019once et du poids troy<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Plusieurs th\u00e9ories existent pour expliquer les origines de l\u2019once troy, et la plus c\u00e9l\u00e8bre vient de la vile de Troyes en France.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">L\u2019uncia romaine et les divisions par 12<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Chez les Romains, l\u2019unit\u00e9 de masse la plus importante \u00e9tait la livre (libra) et valait environ 324 grammes. L\u2019once, ou <em>uncia<\/em>, correspondait \u00e0 <strong>un douzi\u00e8me de la livre<\/strong> soit 27 grammes et des poussi\u00e8res. Il s\u2019agit de la premi\u00e8re utilisation de l\u2019once comme unit\u00e9 de mesure de masse, mais cette uncia est encore un peu loin des 31,103 grammes de l\u2019once troy. Ce qu\u2019il faut retenir ici&nbsp;: <strong>le principe de division par 12 ou syst\u00e8me duod\u00e9cimal, <\/strong>qui rendait les calculs plus faciles pour les \u00e9changes commerciaux. Charlemagne a lui-m\u00eame d\u00e9cid\u00e9 de conserver ces \u00e9quivalences, avec 12 onces dans une livre. <strong>M\u00eame chose en Angleterre&nbsp;: c\u2019est le poids troy qui fait autorit\u00e9 \u00e0 partir de la fin Moyen \u00c2ge, avant l\u2019adoption du syst\u00e8me m\u00e9trique<\/strong>.&nbsp;Et dans ce syst\u00e8me : une livre = 12 onces troy. Le poids troy est justement ce qui nous int\u00e9resse, mais d\u2019o\u00f9 vient-il&nbsp;?<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">L\u2019once troy vient-elle de la ville de Troyes&nbsp;?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019analogie entre troy et Troyes est facile, mais pas forc\u00e9ment simpliste&nbsp;! <strong>Le poids troy aurait en effet \u00e9t\u00e9 invent\u00e9 \u00e0 Troyes<\/strong>, plus exactement pendant les foires champenoises tr\u00e8s populaires au XII<sup>e<\/sup> et au XIII<sup>e<\/sup> si\u00e8cle. Croyez-le ou non, mais Troyes b\u00e9n\u00e9ficiait d\u2019un rayonnement dans toute l\u2019Europe. La ville \u00e9tait id\u00e9alement situ\u00e9e, au carrefour de plusieurs voies romaines, et constituait une place de march\u00e9 tr\u00e8s importante pour le commerce des textiles et des \u00e9pices notamment. <strong>Pour mettre d\u2019accord les marchands issus de diff\u00e9rents pays, il fallait une unit\u00e9 de r\u00e9f\u00e9rence<\/strong>. C\u2019est le poids troy qui aurait \u00e9t\u00e9 utilis\u00e9 pendant ces foires pour faciliter les pes\u00e9es et les transactions, et l\u2019once aurait \u00e9t\u00e9 conserv\u00e9e pour les m\u00e9taux pr\u00e9cieux. Cette th\u00e9orie se tient et elle est largement relay\u00e9e, mais ce n\u2019est qu\u2019une supposition. Elle est \u00e9voqu\u00e9e dans l\u2019encyclop\u00e9die Britannica (1) et dans un article publi\u00e9 sur le site de la LBMA (2), sans jamais \u00eatre r\u00e9ellement affirm\u00e9e.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Le poids troy selon le dictionnaire des dialectes anglais<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Une autre hypoth\u00e8se rapport\u00e9e par la LBMA concernant l\u2019origine du poids troy nous ram\u00e8ne en Grande-Bretagne. Sir Charles Moore Watson, officier et ing\u00e9nieur britannique, publie en 1910 <em>Weights and measures as described in the laws of England from Anglo-Saxon times. <\/em>Il y d\u00e9crypte toutes sortes d\u2019unit\u00e9s de mesure, et apporte un tout autre \u00e9clairage sur l\u2019origine du poids troy\u2026 sans \u00e9voquer la ville de Troyes ni les foires champenoises. Il se base notamment sur <em>The English Dialect Dictionary<\/em> du professeur Joseph Wright (3) qui donne <strong>la d\u00e9finition suivante au mot troy&nbsp;: balance romaine<\/strong>. Et il faut dire que \u00e7a se tient&nbsp;aussi&nbsp;! D\u2019ailleurs, ces deux explications de la ville de Troyes et de la balance peuvent tout \u00e0 fait coexister, en m\u00ealant principes de pes\u00e9es et d\u2019\u00e9changes commerciaux.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tout savoir sur l&rsquo;once troy en vid\u00e9o<\/h2>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"jeg_video_container jeg_video_content\"><iframe title=\"C\u2019est quoi une once d\u2019or ou d\u2019argent ? | Acad\u00e9mie auCOFFRE\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/GK-Inp_Kg4E?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Sources<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>(1) <a href=\"https:\/\/www.britannica.com\/science\/troy-weight\">Troy weight<\/a>, Encyclop\u00e9die Britannica<\/li>\n\n\n\n<li>(2) <a href=\"https:\/\/www.lbma.org.uk\/alchemist\/issue-101\/weighty-matters-looking-for-troy\">Weighty Matters Looking for Troy<\/a>, London Bullion Market Association<\/li>\n\n\n\n<li>(3) <a href=\"https:\/\/archive.org\/details\/englishdialectdi06wrig\/page\/250\/mode\/2up?q=troy\">D\u00e9finition de \u00ab&nbsp;troy&nbsp;\u00bb<\/a>, The English Dialect Dictionary<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Prix de l\u2019once d\u2019or, cours de l\u2019once d\u2019argent, once troy&nbsp;: des termes qui vous sont s\u00fbrement familiers si vous suivez l\u2019actualit\u00e9 des m\u00e9taux pr\u00e9cieux. Mais vous \u00eates-vous d\u00e9j\u00e0 demand\u00e9 ce qu\u2019\u00e9tait une once troy exactement&nbsp;? Et pourquoi cette unit\u00e9 est-elle utilis\u00e9e comme r\u00e9f\u00e9rence internationale pour conna\u00eetre le prix de l\u2019or&nbsp;? L\u2019Acad\u00e9mie vous propose un voyage [&hellip;]<\/p>\n","protected":false},"author":34,"featured_media":4852,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","jnews-multi-image_gallery":[],"jnews_single_post":{"subtitle":"","format":"standard","video":"","gallery":"","source_name":"","source_url":"","via_name":"","via_url":"","override_template":"0","override":[{"template":"8","single_blog_custom":"","parallax":"1","fullscreen":"0","layout":"no-sidebar-narrow","sidebar":"default-sidebar","second_sidebar":"default-sidebar","sticky_sidebar":"1","share_position":"bottom","share_float_style":"share-monocrhome","show_share_counter":"1","show_view_counter":"1","show_featured":"1","show_post_meta":"1","show_post_author":"0","show_post_author_image":"1","show_post_date":"1","post_date_format":"default","post_date_format_custom":"Y\/m\/d","show_post_category":"1","show_post_reading_time":"1","post_reading_time_wpm":"300","show_zoom_button":"0","zoom_button_out_step":"2","zoom_button_in_step":"3","show_post_tag":"1","show_prev_next_post":"1","show_popup_post":"1","number_popup_post":"2","show_author_box":"1","show_post_related":"1","show_inline_post_related":"0"}],"override_image_size":"0","image_override":[{"single_post_thumbnail_size":"crop-500","single_post_gallery_size":"crop-500"}],"trending_post":"0","trending_post_position":"meta","trending_post_label":"Trending","sponsored_post":"0","sponsored_post_label":"Sponsored by","sponsored_post_name":"","sponsored_post_url":"","sponsored_post_logo_enable":"0","sponsored_post_logo":"","sponsored_post_desc":"","disable_ad":"0"},"jnews_primary_category":{"id":"","hide":""},"jnews_social_meta":{"fb_title":"","fb_description":"","fb_image":"","twitter_title":"","twitter_description":"","twitter_image":""},"jnews_override_counter":{"override_view_counter":"0","view_counter_number":"0","override_share_counter":"0","share_counter_number":"0","override_like_counter":"0","like_counter_number":"0","override_dislike_counter":"0","dislike_counter_number":"0"},"footnotes":""},"categories":[80],"tags":[],"niveau":[],"class_list":["post-4848","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-univers-metaux-precieux"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>M\u00e9taux pr\u00e9cieux : qu&#039;est-ce qu&#039;une once troy ?<\/title>\n<meta name=\"description\" content=\"L&#039;once troy est l&#039;unit\u00e9 de r\u00e9f\u00e9rence sur le march\u00e9 de l&#039;or et de l&#039;argent. Pourquoi l&#039;once troy et d&#039;o\u00f9 vient-elle ?\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"M\u00e9taux pr\u00e9cieux : qu&#039;est-ce qu&#039;une once troy ?\" \/>\n<meta property=\"og:description\" content=\"L&#039;once troy est l&#039;unit\u00e9 de r\u00e9f\u00e9rence sur le march\u00e9 de l&#039;or et de l&#039;argent. Pourquoi l&#039;once troy et d&#039;o\u00f9 vient-elle ?\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/\" \/>\n<meta property=\"og:site_name\" content=\"L&#039;acad\u00e9mie AuCOFFRE\" \/>\n<meta property=\"article:published_time\" content=\"2026-03-11T13:44:28+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-07T16:09:20+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.aucoffre.com\/academie\/wp-content\/uploads\/sites\/9\/2026\/03\/once-troy-definition.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1349\" \/>\n\t<meta property=\"og:image:height\" content=\"756\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Sophie Garrigues\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sophie Garrigues\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/once-troy-or-definition\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/once-troy-or-definition\\\/\"},\"author\":{\"name\":\"Sophie Garrigues\",\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/#\\\/schema\\\/person\\\/24462ab8c56dc22deccf9637cfd6da0a\"},\"headline\":\"Qu\u2019est-ce qu\u2019une once d\u2019or ou d\u2019argent\u00a0?\",\"datePublished\":\"2026-03-11T13:44:28+00:00\",\"dateModified\":\"2026-05-07T16:09:20+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/once-troy-or-definition\\\/\"},\"wordCount\":1289,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/once-troy-or-definition\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/wp-content\\\/uploads\\\/sites\\\/9\\\/2026\\\/03\\\/once-troy-definition.png\",\"articleSection\":[\"L'univers des m\u00e9taux pr\u00e9cieux\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/once-troy-or-definition\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/once-troy-or-definition\\\/\",\"url\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/once-troy-or-definition\\\/\",\"name\":\"M\u00e9taux pr\u00e9cieux : qu'est-ce qu'une once troy ?\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/once-troy-or-definition\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/once-troy-or-definition\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/wp-content\\\/uploads\\\/sites\\\/9\\\/2026\\\/03\\\/once-troy-definition.png\",\"datePublished\":\"2026-03-11T13:44:28+00:00\",\"dateModified\":\"2026-05-07T16:09:20+00:00\",\"description\":\"L'once troy est l'unit\u00e9 de r\u00e9f\u00e9rence sur le march\u00e9 de l'or et de l'argent. Pourquoi l'once troy et d'o\u00f9 vient-elle ?\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/once-troy-or-definition\\\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/once-troy-or-definition\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/once-troy-or-definition\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/wp-content\\\/uploads\\\/sites\\\/9\\\/2026\\\/03\\\/once-troy-definition.png\",\"contentUrl\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/wp-content\\\/uploads\\\/sites\\\/9\\\/2026\\\/03\\\/once-troy-definition.png\",\"width\":1349,\"height\":756},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/once-troy-or-definition\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Qu\u2019est-ce qu\u2019une once d\u2019or ou d\u2019argent\u00a0?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/#website\",\"url\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/\",\"name\":\"L&#039;acad\u00e9mie AuCOFFRE\",\"description\":\"Entrez dans l&#039;univers des m\u00e9taux pr\u00e9cieux.\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/#organization\",\"name\":\"L&#039;acad\u00e9mie AuCOFFRE\",\"url\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/wp-content\\\/uploads\\\/sites\\\/9\\\/2022\\\/03\\\/logo_aucoffre-e1647443488524.png\",\"contentUrl\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/wp-content\\\/uploads\\\/sites\\\/9\\\/2022\\\/03\\\/logo_aucoffre-e1647443488524.png\",\"width\":250,\"height\":75,\"caption\":\"L&#039;acad\u00e9mie AuCOFFRE\"},\"image\":{\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/#\\\/schema\\\/person\\\/24462ab8c56dc22deccf9637cfd6da0a\",\"name\":\"Sophie Garrigues\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/6bcd5ea2ff0b16210f5c2114413bf490aba9d9a9ef08e3b0982a8e754b183419?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/6bcd5ea2ff0b16210f5c2114413bf490aba9d9a9ef08e3b0982a8e754b183419?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/6bcd5ea2ff0b16210f5c2114413bf490aba9d9a9ef08e3b0982a8e754b183419?s=96&d=mm&r=g\",\"caption\":\"Sophie Garrigues\"},\"description\":\"R\u00e9dactrice Web depuis 2012 et contributrice \u00e0 l'Acad\u00e9mie AuCOFFRE, je me consacre \u00e0 l\u2019univers des m\u00e9taux pr\u00e9cieux et plus particuli\u00e8rement aux pi\u00e8ces d\u2019or et d'argent. Mon but : transmettre, \u00e9clairer\u2026 et apporter ma petite pierre \\\"pr\u00e9cieuse\\\" \u00e0 l\u2019\u00e9difice.\",\"url\":\"https:\\\/\\\/www.aucoffre.com\\\/academie\\\/author\\\/sgarrigues\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"M\u00e9taux pr\u00e9cieux : qu'est-ce qu'une once troy ?","description":"L'once troy est l'unit\u00e9 de r\u00e9f\u00e9rence sur le march\u00e9 de l'or et de l'argent. Pourquoi l'once troy et d'o\u00f9 vient-elle ?","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/","og_locale":"fr_FR","og_type":"article","og_title":"M\u00e9taux pr\u00e9cieux : qu'est-ce qu'une once troy ?","og_description":"L'once troy est l'unit\u00e9 de r\u00e9f\u00e9rence sur le march\u00e9 de l'or et de l'argent. Pourquoi l'once troy et d'o\u00f9 vient-elle ?","og_url":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/","og_site_name":"L&#039;acad\u00e9mie AuCOFFRE","article_published_time":"2026-03-11T13:44:28+00:00","article_modified_time":"2026-05-07T16:09:20+00:00","og_image":[{"width":1349,"height":756,"url":"https:\/\/www.aucoffre.com\/academie\/wp-content\/uploads\/sites\/9\/2026\/03\/once-troy-definition.png","type":"image\/png"}],"author":"Sophie Garrigues","twitter_card":"summary_large_image","twitter_misc":{"\u00c9crit par":"Sophie Garrigues","Dur\u00e9e de lecture estim\u00e9e":"6 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/#article","isPartOf":{"@id":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/"},"author":{"name":"Sophie Garrigues","@id":"https:\/\/www.aucoffre.com\/academie\/#\/schema\/person\/24462ab8c56dc22deccf9637cfd6da0a"},"headline":"Qu\u2019est-ce qu\u2019une once d\u2019or ou d\u2019argent\u00a0?","datePublished":"2026-03-11T13:44:28+00:00","dateModified":"2026-05-07T16:09:20+00:00","mainEntityOfPage":{"@id":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/"},"wordCount":1289,"commentCount":0,"publisher":{"@id":"https:\/\/www.aucoffre.com\/academie\/#organization"},"image":{"@id":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/#primaryimage"},"thumbnailUrl":"https:\/\/www.aucoffre.com\/academie\/wp-content\/uploads\/sites\/9\/2026\/03\/once-troy-definition.png","articleSection":["L'univers des m\u00e9taux pr\u00e9cieux"],"inLanguage":"fr-FR","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/","url":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/","name":"M\u00e9taux pr\u00e9cieux : qu'est-ce qu'une once troy ?","isPartOf":{"@id":"https:\/\/www.aucoffre.com\/academie\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/#primaryimage"},"image":{"@id":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/#primaryimage"},"thumbnailUrl":"https:\/\/www.aucoffre.com\/academie\/wp-content\/uploads\/sites\/9\/2026\/03\/once-troy-definition.png","datePublished":"2026-03-11T13:44:28+00:00","dateModified":"2026-05-07T16:09:20+00:00","description":"L'once troy est l'unit\u00e9 de r\u00e9f\u00e9rence sur le march\u00e9 de l'or et de l'argent. Pourquoi l'once troy et d'o\u00f9 vient-elle ?","breadcrumb":{"@id":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/#primaryimage","url":"https:\/\/www.aucoffre.com\/academie\/wp-content\/uploads\/sites\/9\/2026\/03\/once-troy-definition.png","contentUrl":"https:\/\/www.aucoffre.com\/academie\/wp-content\/uploads\/sites\/9\/2026\/03\/once-troy-definition.png","width":1349,"height":756},{"@type":"BreadcrumbList","@id":"https:\/\/www.aucoffre.com\/academie\/once-troy-or-definition\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Accueil","item":"https:\/\/www.aucoffre.com\/academie\/"},{"@type":"ListItem","position":2,"name":"Qu\u2019est-ce qu\u2019une once d\u2019or ou d\u2019argent\u00a0?"}]},{"@type":"WebSite","@id":"https:\/\/www.aucoffre.com\/academie\/#website","url":"https:\/\/www.aucoffre.com\/academie\/","name":"L&#039;acad\u00e9mie AuCOFFRE","description":"Entrez dans l&#039;univers des m\u00e9taux pr\u00e9cieux.","publisher":{"@id":"https:\/\/www.aucoffre.com\/academie\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.aucoffre.com\/academie\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"},{"@type":"Organization","@id":"https:\/\/www.aucoffre.com\/academie\/#organization","name":"L&#039;acad\u00e9mie AuCOFFRE","url":"https:\/\/www.aucoffre.com\/academie\/","logo":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/www.aucoffre.com\/academie\/#\/schema\/logo\/image\/","url":"https:\/\/www.aucoffre.com\/academie\/wp-content\/uploads\/sites\/9\/2022\/03\/logo_aucoffre-e1647443488524.png","contentUrl":"https:\/\/www.aucoffre.com\/academie\/wp-content\/uploads\/sites\/9\/2022\/03\/logo_aucoffre-e1647443488524.png","width":250,"height":75,"caption":"L&#039;acad\u00e9mie AuCOFFRE"},"image":{"@id":"https:\/\/www.aucoffre.com\/academie\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.aucoffre.com\/academie\/#\/schema\/person\/24462ab8c56dc22deccf9637cfd6da0a","name":"Sophie Garrigues","image":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/secure.gravatar.com\/avatar\/6bcd5ea2ff0b16210f5c2114413bf490aba9d9a9ef08e3b0982a8e754b183419?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/6bcd5ea2ff0b16210f5c2114413bf490aba9d9a9ef08e3b0982a8e754b183419?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/6bcd5ea2ff0b16210f5c2114413bf490aba9d9a9ef08e3b0982a8e754b183419?s=96&d=mm&r=g","caption":"Sophie Garrigues"},"description":"R\u00e9dactrice Web depuis 2012 et contributrice \u00e0 l'Acad\u00e9mie AuCOFFRE, je me consacre \u00e0 l\u2019univers des m\u00e9taux pr\u00e9cieux et plus particuli\u00e8rement aux pi\u00e8ces d\u2019or et d'argent. Mon but : transmettre, \u00e9clairer\u2026 et apporter ma petite pierre \"pr\u00e9cieuse\" \u00e0 l\u2019\u00e9difice.","url":"https:\/\/www.aucoffre.com\/academie\/author\/sgarrigues\/"}]}},"_links":{"self":[{"href":"https:\/\/www.aucoffre.com\/academie\/wp-json\/wp\/v2\/posts\/4848","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.aucoffre.com\/academie\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.aucoffre.com\/academie\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.aucoffre.com\/academie\/wp-json\/wp\/v2\/users\/34"}],"replies":[{"embeddable":true,"href":"https:\/\/www.aucoffre.com\/academie\/wp-json\/wp\/v2\/comments?post=4848"}],"version-history":[{"count":5,"href":"https:\/\/www.aucoffre.com\/academie\/wp-json\/wp\/v2\/posts\/4848\/revisions"}],"predecessor-version":[{"id":4971,"href":"https:\/\/www.aucoffre.com\/academie\/wp-json\/wp\/v2\/posts\/4848\/revisions\/4971"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.aucoffre.com\/academie\/wp-json\/wp\/v2\/media\/4852"}],"wp:attachment":[{"href":"https:\/\/www.aucoffre.com\/academie\/wp-json\/wp\/v2\/media?parent=4848"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.aucoffre.com\/academie\/wp-json\/wp\/v2\/categories?post=4848"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.aucoffre.com\/academie\/wp-json\/wp\/v2\/tags?post=4848"},{"taxonomy":"niveau","embeddable":true,"href":"https:\/\/www.aucoffre.com\/academie\/wp-json\/wp\/v2\/niveau?post=4848"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}