{"id":68089,"date":"2025-05-09T11:17:15","date_gmt":"2025-05-09T09:17:15","guid":{"rendered":"https:\/\/www.goldor.ch\/?p=68089"},"modified":"2025-05-14T13:31:03","modified_gmt":"2025-05-14T11:31:03","slug":"chaque-diamant-est-une-histoire","status":"publish","type":"post","link":"https:\/\/www.goldor.ch\/fr\/chaque-diamant-est-une-histoire\/","title":{"rendered":"\u00abChaque diamant est une histoire!\u00bb"},"content":{"rendered":"<p><em>Repr\u00e9sentant de la troisi\u00e8me g\u00e9n\u00e9ration \u00e0 la t\u00eate de la maison Tach\u00e9, Jean-Jacques Tach\u00e9 est consultant pour le d\u00e9partement \u00abPierres exceptionnelles\u00bb consacr\u00e9 \u00e0 l\u2019achat de diamants bruts d\u2019exception, \u00e0 leur transformation en pierres taill\u00e9es et \u00e0 leur commercialisation. En plus de r\u00e9aliser des approvisionnements directs aupr\u00e8s de De Beers, le d\u00e9partement participe chaque ann\u00e9e \u00e0 une cinquantaine de ventes aux ench\u00e8res organis\u00e9es par des mines ind\u00e9pendantes.<\/em><\/p>\n<h3 style=\"font-weight: 400;\"><strong><em>Gold\u2019Or: Comment le march\u00e9 des pierres d\u2019exception a-t-il \u00e9volu\u00e9 ces derni\u00e8res ann\u00e9es?<\/em><\/strong><\/h3>\n<p style=\"font-weight: 400;\">Jean-Jacques Tach\u00e9: Il y a 25 ans, le march\u00e9 \u00e9tait largement domin\u00e9 par De Beers, qui d\u00e9tenait environ 80 pour cent de la production mondiale. La maison Tach\u00e9 \u00e9tait alors fortement d\u00e9pendant de ce qu\u2019elle recevait. Aujourd\u2019hui, l\u2019\u00e9cosyst\u00e8me s\u2019est diversifi\u00e9: de nombreuses petites mines ind\u00e9pendantes sont apparues et proposent, elles aussi, des pierres brutes d\u2019exception, avec une vari\u00e9t\u00e9 et une s\u00e9lection beaucoup plus riche. Parall\u00e8lement, le march\u00e9 des grosses pierres s\u2019est consid\u00e9rablement d\u00e9velopp\u00e9. Cette \u00e9volution nous a naturellement amen\u00e9s \u00e0 renforcer notre collaboration avec les grandes maisons de joaillerie, jusqu\u2019\u00e0 devenir un acteur cl\u00e9, au croisement entre l\u2019industrie mini\u00e8re et le secteur du luxe.<\/p>\n<figure id=\"attachment_67499\" aria-describedby=\"caption-attachment-67499\" style=\"width: 765px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-67499 size-medium\" src=\"https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tache_Lesotho-Legend-1-765x510.jpg\" alt=\"\" width=\"765\" height=\"510\" srcset=\"https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tache_Lesotho-Legend-1-765x510.jpg 765w, https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tache_Lesotho-Legend-1-768x512.jpg 768w, https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tache_Lesotho-Legend-1.jpg 1000w\" sizes=\"(max-width: 765px) 100vw, 765px\" \/><figcaption id=\"caption-attachment-67499\" class=\"wp-caption-text\">Diamant ovale de 15.50 carats, accompagn\u00e9 d\u2019un document d\u00e9taill\u00e9 reprenant tous les angles et param\u00e8tres de la pierre.<\/figcaption><\/figure>\n<h3 style=\"font-weight: 400;\"><strong><em>\u00c0 quelles ventes Tach\u00e9 participe-t-il chaque ann\u00e9e?<\/em><\/strong><\/h3>\n<p style=\"font-weight: 400;\">De Beers reste un acteur de premier plan avec environ 35 pour cent de parts de march\u00e9. Le r\u00f4le de sightholder donne acc\u00e8s \u00e0 ses ventes r\u00e9guli\u00e8res, mais cela exige \u00e9galement des comp\u00e9tences techniques de haut niveau pour transformer les marchandises achet\u00e9es en pierres taill\u00e9es r\u00e9pondant aux exigences des maisons les plus prestigieuses. En compl\u00e9ment, Tach\u00e9 participe \u00e0 une cinquantaine de ventes aux ench\u00e8res par an, organis\u00e9es par des mines ind\u00e9pendantes situ\u00e9es notamment au Botswana, au Lesotho, au Canada et en Afrique du Sud.<\/p>\n<figure id=\"attachment_67808\" aria-describedby=\"caption-attachment-67808\" style=\"width: 477px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\" wp-image-67808\" src=\"https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/CS_Tache_Jean-Jacques-Tache-BW-Kopie-1-673x510.jpg\" alt=\"\" width=\"477\" height=\"362\" srcset=\"https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/CS_Tache_Jean-Jacques-Tache-BW-Kopie-1-673x510.jpg 673w, https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/CS_Tache_Jean-Jacques-Tache-BW-Kopie-1-768x582.jpg 768w, https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/CS_Tache_Jean-Jacques-Tache-BW-Kopie-1.jpg 1200w\" sizes=\"(max-width: 477px) 100vw, 477px\" \/><figcaption id=\"caption-attachment-67808\" class=\"wp-caption-text\">Jean-Jacques Tach\u00e9<\/figcaption><\/figure>\n<h3 style=\"font-weight: 400;\"><strong><em>Quels diamants rel\u00e8vent du d\u00e9partement \u00abPierres exceptionnelles\u00bb?<\/em><\/strong><\/h3>\n<p style=\"font-weight: 400;\">Nous parlons ici de pierres brutes \u00e0 partir de dix carats, g\u00e9n\u00e9ralement vendues individuellement par les mines. La plus grosse pierre brute que Tach\u00e9 a acquis pesait plus de 900 carats. Une fois taill\u00e9, un diamant affiche en moyenne 40 \u00e0 50 pour cent du poids initial de la pierre brute. L\u2019objectif est de viser syst\u00e9matiquement le segment haut de gamme, tant en termes de couleur que de puret\u00e9.<\/p>\n<figure id=\"attachment_67517\" aria-describedby=\"caption-attachment-67517\" style=\"width: 510px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-67517 size-medium\" src=\"https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tachee_342ct_Queen-of-Kalahari-510x510.jpg\" alt=\"\" width=\"510\" height=\"510\" srcset=\"https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tachee_342ct_Queen-of-Kalahari-510x510.jpg 510w, https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tachee_342ct_Queen-of-Kalahari-768x768.jpg 768w, https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tachee_342ct_Queen-of-Kalahari.jpg 1000w\" sizes=\"(max-width: 510px) 100vw, 510px\" \/><figcaption id=\"caption-attachment-67517\" class=\"wp-caption-text\">Les 23 diamants de la collection \u00abThe Queen of Kalahari\u00bb de Chopard, ainsi que le diamant brut du m\u00eame nom d&rsquo;un poids de 342 carats, d\u00e9couvert dans la mine Karowe au Botswana.<\/figcaption><\/figure>\n<h3 style=\"font-weight: 400;\"><strong><em>Comment une pierre brute est-elle expertis\u00e9e avant l\u2019achat?<\/em><\/strong><\/h3>\n<p style=\"font-weight: 400;\">Il est essentiel d\u2019analyser la pierre en main \u00e0 la source afin de savoir si elle entre en compte pour un achat. Tach\u00e9 est \u00e9quip\u00e9 d\u2019instruments et de logiciels de mod\u00e9lisation, mais l\u2019efficacit\u00e9 des premi\u00e8res analyses reste limit\u00e9e par rapport \u00e0 ce que Tach\u00e9 peut faire dans son laboratoire. L\u2019exp\u00e9rience joue d\u00e8s lors un r\u00f4le crucial: l\u2019\u0153il, le ressenti, la connaissance de chaque mine et de ses caract\u00e9ristiques sont d\u00e9terminants. Chaque achat repose alors sur une combinaison de savoir-faire technique et d\u2019intuition.<\/p>\n<h3 style=\"font-weight: 400;\"><strong><em>Avez-vous d\u00e9j\u00e0 un client en t\u00eate lors de l\u2019achat?<\/em><\/strong><\/h3>\n<p style=\"font-weight: 400;\">Pour les projets de taille moyenne, Tach\u00e9 ach\u00e8te parfois sans avoir de client en t\u00eate. Mais plus une pierre est rare et pr\u00e9cieuse, plus nous cherchons \u00e0 susciter l\u2019int\u00e9r\u00eat d\u2019un client en amont. Il peut \u00e9galement arriver qu\u2019on recherche une pierre sp\u00e9cifique en r\u00e9ponse \u00e0 une demande particuli\u00e8re.<\/p>\n<figure id=\"attachment_67491\" aria-describedby=\"caption-attachment-67491\" style=\"width: 510px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-67491 size-medium\" src=\"https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tache_Blume-510x510.jpg\" alt=\"\" width=\"510\" height=\"510\" srcset=\"https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tache_Blume-510x510.jpg 510w, https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tache_Blume-768x768.jpg 768w, https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tache_Blume.jpg 1000w\" sizes=\"(max-width: 510px) 100vw, 510px\" \/><figcaption id=\"caption-attachment-67491\" class=\"wp-caption-text\">Diamant Orangy Yellow de taille poire.<\/figcaption><\/figure>\n<h3 style=\"font-weight: 400;\"><strong><em>Que devient la pierre brute apr\u00e8s l\u2019achat?<\/em><\/strong><\/h3>\n<p style=\"font-weight: 400;\">Elle est d\u2019abord envoy\u00e9e au GIA pour \u00e9tablir un \u00abDiamond Origin Report\u00bb, qui certifie son origine. Cela permet, lorsque la pierre taill\u00e9e est \u00e0 nouveau envoy\u00e9e pour certification, de prouver qu\u2019il s\u2019agit bien de la m\u00eame pierre. Ensuite, la pierre est analys\u00e9e en profondeur dans notre laboratoire pour d\u00e9finir sa taille optimale. Pour certaines pierres importantes, il existe jusqu\u2019\u00e0 70 sc\u00e9narios de taille envisageables. Ce processus de r\u00e9flexion est souvent plus long que la taille elle-m\u00eame. Lors de projets extraordinaires, les clients sont souvent impliqu\u00e9s au processus d\u00e8s le d\u00e9but. Tach\u00e9 taille environ 90 pour cent de ces pierres exceptionnelles dans son atelier d\u2019Anvers, o\u00f9 on dispose de toutes les technologies n\u00e9cessaires, ainsi que de la proximit\u00e9 avec des experts. Le premier sciage est r\u00e9alis\u00e9 au laser, tandis que les op\u00e9rations de facettage sont effectu\u00e9es manuellement sur des disques enduits de poudre de diamant.<\/p>\n<h3 style=\"font-weight: 400;\"><strong><em>Qui comptez-vous parmi vos clients?<\/em><\/strong><\/h3>\n<p style=\"font-weight: 400;\">La client\u00e8le a naturellement \u00e9volu\u00e9 au fil des 25 derni\u00e8res ann\u00e9es, notamment sur le segment des grandes pierres, o\u00f9 nous nous sommes rapproch\u00e9s des maisons de joaillerie les plus prestigieuses. L\u2019offre n\u2019est cependant pas limit\u00e9e par ce positionnement dans le segment de prix sup\u00e9rieur. Tach\u00e9 continue en effet de servir \u00e9galement des fabricants, des grossistes et des bijoutiers exigeants, \u00e0 la recherche de diamants de qualit\u00e9 irr\u00e9prochable, qu\u2019il s\u2019agisse de pierres de trois points ou de pierres d\u2019exception.<\/p>\n<figure id=\"attachment_67515\" aria-describedby=\"caption-attachment-67515\" style=\"width: 770px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-67515 size-medium\" src=\"https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tache_Radiant-770x510.jpg\" alt=\"\" width=\"770\" height=\"510\" srcset=\"https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tache_Radiant-770x510.jpg 770w, https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tache_Radiant-768x508.jpg 768w, https:\/\/www.goldor.ch\/wp-content\/uploads\/2025\/04\/3-2025-CS_Tache_Radiant.jpg 1000w\" sizes=\"(max-width: 770px) 100vw, 770px\" \/><figcaption id=\"caption-attachment-67515\" class=\"wp-caption-text\">Un diamant brut de 400 carats \u00e0 c\u00f4t\u00e9 du diamant taill\u00e9 de +100 carats.<\/figcaption><\/figure>\n<h3 style=\"font-weight: 400;\"><strong><em>Qu\u2019est-ce qui fait, pour vous, l\u2019attrait des diamants?<\/em><\/strong><\/h3>\n<p style=\"font-weight: 400;\">Ce qui me fascine dans le diamant, c\u2019est son unicit\u00e9. Chaque pierre est diff\u00e9rente. \u00catre pr\u00e9sent \u00e0 chaque \u00e9tape de son parcours, de la mine \u00e0 la taille, jusqu\u2019\u00e0 son int\u00e9gration dans une pi\u00e8ce de haute joaillerie, donne une dimension \u00e9motionnelle rare \u00e0 notre m\u00e9tier. Chaque diamant raconte sa propre histoire, et c\u2019est cette aventure que nous vivons avec passion, pierre apr\u00e8s pierre. mw<\/p>\n<h5>Photo: Jean-Jacques Tach\u00e9<\/h5>\n","protected":false},"excerpt":{"rendered":"<p>Repr\u00e9sentant de la troisi\u00e8me g\u00e9n\u00e9ration \u00e0 la t\u00eate de la maison Tach\u00e9, Jean-Jacques Tach\u00e9 est consultant pour le d\u00e9partement \u00abPierres exceptionnelles\u00bb.<\/p>\n<a href=\"https:\/\/www.goldor.ch\/fr\/chaque-diamant-est-une-histoire\/\" class=\"article-more\" title=\"mehr\">plus<\/a>","protected":false},"author":7,"featured_media":68088,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[281],"tags":[246,2420],"class_list":["post-68089","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-fr","tag-diamants","tag-tache-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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