{"id":72463,"date":"2020-04-23T03:14:05","date_gmt":"2020-04-23T03:14:05","guid":{"rendered":"https:\/\/canadagold.ca\/?p=72463"},"modified":"2025-02-28T03:23:04","modified_gmt":"2025-02-28T03:23:04","slug":"math-of-gold-how-to-calculate-the-value-of-your-gold","status":"publish","type":"post","link":"https:\/\/canadagold.ca\/fr\/math-of-gold-how-to-calculate-the-value-of-your-gold\/","title":{"rendered":"Math\u00e9matiques de l'or - Comment calculer la valeur de votre or"},"content":{"rendered":"

Le prix de l'or vous incite \u00e0 vendre vos bijoux dont vous ne voulez plus ? Avant de vous s\u00e9parer de vos pi\u00e8ces d'or, il peut \u00eatre utile de conna\u00eetre le poids en carats. Mais la densit\u00e9, les bijoux plaqu\u00e9s or et les mesures de poids en centimes peuvent pr\u00eater \u00e0 confusion et conduire \u00e0 un mauvais classement des karats pour la puret\u00e9. Que signifie tout cela, me direz-vous ? Ne vous inqui\u00e9tez pas des flashbacks effrayants des cours de math\u00e9matiques. Nous allons vous expliquer comment d\u00e9terminer la teneur en or pur de n'importe quel poids en carats.\u00a0<\/span><\/p>\n

<\/p>\n

Qu'est-ce qu'une once de Troie ?<\/h2>\n

L'once Troy est une unit\u00e9 de poids utilis\u00e9e pour les m\u00e9taux pr\u00e9cieux, tels que l'or, l'argent, le platine et le palladium. Une once Troy \u00e9quivaut \u00e0 31,103 g. L'once de Troie ne doit pas \u00eatre confondue avec l'once \"Avoirdupois\", qui est de 28,35 g. Pour compliquer encore la d\u00e9finition d'une once, une once liquide am\u00e9ricaine a un volume de 29,57 ml, alors qu'une once liquide imp\u00e9riale a un volume de 28,41 ml.<\/span><\/p>\n

\"one<\/a>

Pes\u00e9e d'une pi\u00e8ce d'or d'une once troy<\/p><\/div>\n

 <\/p>\n

Qu'est-ce qu'un karatage de l'or ?<\/h2>\n

Le karatage est une mesure de la puret\u00e9 (en pourcentage) ou de la finesse (en parties par millier) de l'or, l'or pur \u00e9tant d\u00e9fini comme \"24 carats\". Le karatage n'est pas utilis\u00e9 pour d\u00e9crire la puret\u00e9 de l'argent ou d'autres m\u00e9taux pr\u00e9cieux. La puret\u00e9 de l'or peut \u00eatre calcul\u00e9e en divisant le nombre de carats par 24, comme dans le tableau ci-dessous. Il convient de distinguer le \"karat\" du \"carat\", qui est une mesure du poids d'une pierre pr\u00e9cieuse, \u00e9gale \u00e0 0,2 g).\u00a0<\/span><\/p>\n\n\n\n\n\n\n\n\n\n
Karatage (k, ou kt)<\/span><\/td>\nFinesse (parties par millier)<\/span><\/td>\nPuret\u00e9 (pourcentage)<\/span><\/td>\n<\/tr>\n
24kt<\/span><\/td>\n999<\/span><\/td>\n99.9%<\/span><\/td>\n<\/tr>\n
22kt<\/span><\/td>\n916<\/span><\/td>\n91.6%<\/span><\/td>\n<\/tr>\n
18kt<\/span><\/td>\n750<\/span><\/td>\n75.0%<\/span><\/td>\n<\/tr>\n
14kt<\/span><\/td>\n583<\/span><\/td>\n58.3%<\/span><\/td>\n<\/tr>\n
10kt<\/span><\/td>\n416<\/span><\/td>\n41.6%<\/span><\/td>\n<\/tr>\n
9kt<\/span><\/td>\n375<\/span><\/td>\n37.5%<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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

Pourquoi vos vieux bijoux valent-ils aujourd'hui plus que ce que vous avez pay\u00e9 pour les acqu\u00e9rir ?<\/h2>\n

Les bijoux sont souvent vendus au d\u00e9tail \u00e0 un prix bien sup\u00e9rieur \u00e0 la valeur des m\u00e9taux pr\u00e9cieux qu'ils contiennent. Cette majoration, qui varie souvent de 2 \u00e0 10 fois la valeur du m\u00e9tal pr\u00e9cieux, permet de payer les frais du fabricant de bijoux, du grossiste, les d\u00e9penses du magasin de d\u00e9tail, les salaires et la marge b\u00e9n\u00e9ficiaire. Lorsqu'un bijou est recycl\u00e9 pour sa teneur en m\u00e9taux pr\u00e9cieux, le recycleur (comme Canada Gold) paie un pourcentage de la teneur en m\u00e9taux pr\u00e9cieux. Chez Canada Gold, nous payons de 80% (pour les pi\u00e8ces affin\u00e9es) \u00e0 110%+ (pour les pi\u00e8ces r\u00e9utilisables). Au cours des 20 derni\u00e8res ann\u00e9es, le prix de l'or a augment\u00e9 de plus de 500%, passant de $250 en 2001 \u00e0 $1500+ en 2020. Par cons\u00e9quent, l'or contenu dans les vieux bijoux vaut souvent plus que ce que le client a pay\u00e9 initialement dans une bijouterie de d\u00e9tail.\u00a0 <\/span><\/p>\n

\"how<\/a>

Un recycleur de bijoux en or fait fondre l'or<\/p><\/div>\n

 <\/p>\n

Qu'est-ce que le remplissage en or ?<\/h2>\n

Un bijou poin\u00e7onn\u00e9 \"Gold Filled\" contient un \u00e9pais placage d'or, de la puret\u00e9 sp\u00e9cifi\u00e9e, entourant un noyau de laiton. Il est int\u00e9ressant de noter qu'un bijou en or contient en fait de l'or \u00e0 l'ext\u00e9rieur et qu'il est rempli de laiton. Par d\u00e9finition, une pi\u00e8ce \"14k G.F.\" contient 95% de laiton et un placage \u00e9pais et durable de 14kg d'or, repr\u00e9sentant 5% du poids total de la pi\u00e8ce. Par cons\u00e9quent, \u00e9tant donn\u00e9 qu'elle contient 5% de son poids d'or 14kt, la pi\u00e8ce contient 2,91% d'or pur en poids. Les montres de poche anciennes provenant des \u00c9tats-Unis sont souvent remplies d'or et ne contiennent donc g\u00e9n\u00e9ralement pas assez d'or pour justifier leur affinage. <\/span><\/p>\n

\"A<\/a>

Montre de poche en or<\/p><\/div>\n

 <\/p>\n

Qu'est-ce que l'or lamin\u00e9 (RG) ou la plaque d'or lamin\u00e9e (RGP) ?<\/h2>\n

Il s'agit de termes suppl\u00e9mentaires qui d\u00e9crivent un processus de plaquage d'or similaire \u00e0 celui du \"Gold Filled\", et le calcul de la puret\u00e9 est identique. Une pi\u00e8ce marqu\u00e9e RG ou RGP contient un m\u00e9tal de base 95% (par exemple, du laiton ou du cuivre), avec une couche ext\u00e9rieure d'or, g\u00e9n\u00e9ralement d'une puret\u00e9 de 14 ou 18 carats. Une pi\u00e8ce poin\u00e7onn\u00e9e \"1\/20 18k RG\", par exemple, contient 3,75% d'or pur en poids (ce qui ne vaut g\u00e9n\u00e9ralement pas la peine d'\u00eatre affin\u00e9).<\/span><\/p>\n

Combien valent mes bijoux plaqu\u00e9s or ?<\/h2>\n

Un bijou plaqu\u00e9 or contient une tr\u00e8s fine couche d'or \u00e0 l'ext\u00e9rieur, appliqu\u00e9e par un proc\u00e9d\u00e9 \u00e9lectrique. C'est pourquoi cette technique peut \u00e9galement \u00eatre appel\u00e9e \"\u00e9lectro-dorage\", et ces pi\u00e8ces portent un poin\u00e7on GP ou EGP. L'\u00e9paisseur de la couche d'or est g\u00e9n\u00e9ralement inf\u00e9rieure \u00e0 1 micron (moins de 1\/1000<\/span>th<\/span> d'un mm !). Le placage a tendance \u00e0 s'effacer et la pi\u00e8ce contient moins de quelques centimes d'or.\u00a0<\/span><\/p>\n

Comment calculer la densit\u00e9 de l'or\u00a0<\/b><\/h2>\n

L'or est l'un des m\u00e9taux les plus denses, avec une densit\u00e9 de 19,32 g par cm cube. Cela signifie qu'un volume d'or est 19,32 fois plus lourd que le m\u00eame volume d'eau. Le plomb, que toute personne ayant subi une radiographie dentaire conna\u00eet, est un autre m\u00e9tal tr\u00e8s dense, avec une densit\u00e9 de 11,5 g par cm cube. \u00c9tonnamment, l'or est 68% plus dense que le plomb. Un iPhone 11 d'Apple a un volume de 87 cm cube.<\/span> et p\u00e8se 188 g. Un lingot d'or de la m\u00eame taille serait presque 9 fois plus lourd (1 680 g) et aurait une valeur en or bien sup\u00e9rieure \u00e0 $100 000CAD au cours de l'or de 2020.\u00a0<\/span><\/p>\n

Qu'est-ce qu'un Pennyweight ?<\/b><\/h2>\n

Le pennyweight est une mesure de poids assez ancienne. Un pennyweight est \u00e9gal \u00e0 1\/20e d'once. Un pennyweight \u00e9quivaut donc \u00e0 1,56 gramme. De nos jours, l'utilisation la plus courante du pennyweight semble \u00eatre celle d'acheteurs d'or peu scrupuleux qui affichent des prix en pennyweight au lieu de grammes pour faire para\u00eetre les prix plus \u00e9lev\u00e9s. Il s'agit l\u00e0 d'une pratique dont il faut se m\u00e9fier !<\/span><\/p>\n

Comprendre comment calculer la teneur en or pur dans n'importe quel poids en carats vous aidera \u00e0 prendre la d\u00e9cision la plus \u00e9clair\u00e9e possible au moment de vendre vos bijoux inutilis\u00e9s.<\/span><\/p>\n

\u00a0<\/span><\/p>\n

\u00a0<\/b><\/p>\n

 <\/p>","protected":false},"excerpt":{"rendered":"

Does the price of gold have you tempted to sell your unwanted jewellery? Before you part with your gold pieces, it may well benefit you to know the karat weight. But density, gold-plated jewellery, and pennyweight measurements can cause confusion, leading to improper karat rating for purity. What does all this mean, you ask? Don\u2019t […]<\/p>\n","protected":false},"author":4,"featured_media":72464,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-72463","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"\nMath Of Gold - How To Calculate The Value Of Your Gold - Canada Gold<\/title>\n<meta name=\"description\" content=\"Easy, simple answers to all your gold questions. 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