{"id":47771,"date":"2026-04-30T11:06:00","date_gmt":"2026-04-30T09:06:00","guid":{"rendered":"https:\/\/www.ssef.ch\/?p=47771"},"modified":"2026-04-30T11:06:00","modified_gmt":"2026-04-30T09:06:00","slug":"eclogitic-orange-yellow-diamonds-coloured-by-the-480-nm-band","status":"publish","type":"post","link":"https:\/\/www.ssef.ch\/zh-hant\/eclogitic-orange-yellow-diamonds-coloured-by-the-480-nm-band\/","title":{"rendered":"Eclogitic orange-yellow diamonds coloured by the 480 nm band"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"47771\" class=\"elementor elementor-47771\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7e59a34 e-flex e-con-boxed qodef-elementor-content-no e-con e-parent\" data-id=\"7e59a34\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-30c8b01 elementor-widget elementor-widget-text-editor\" data-id=\"30c8b01\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>By Dr. Michael Mintrone, first published in <a href=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/02\/facette-2026-web.pdf\" target=\"_blank\" rel=\"noopener\">Facette 30<\/a> (March 2026)<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f781946 elementor-widget elementor-widget-text-editor\" data-id=\"f781946\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tWe recently acquired three orange-yellow diamonds for the SSEF collection research (Figure 1). These diamonds immediately retained our attention when we did the UV-vis-NIR spectra to identify the defect at the origin of their colour. The three diamonds appear to be coloured by an absorption band centred at ca. 480 nm (Figure 2). This band is known to occur in chameleon diamonds and in the rare natural fancy orange-coloured diamond. Therefore, studying these diamonds is very interesting as they are not frequently seen in the lab.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-04fc55f elementor-widget elementor-widget-image\" data-id=\"04fc55f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/Figure_1.jpg\" class=\"attachment-large size-large wp-image-47779\" alt=\"\" srcset=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/Figure_1.jpg 1024w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/Figure_1-300x200.jpg 300w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/Figure_1-768x512.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 1: Three orange\u2013yellow diamonds recently acquired for the SSEF research collection. Photo: SSEF.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6b0dc13 elementor-widget elementor-widget-image\" data-id=\"6b0dc13\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"790\" src=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/428-Figure_2.jpg\" class=\"attachment-large size-large wp-image-47785\" alt=\"\" srcset=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/428-Figure_2.jpg 1024w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/428-Figure_2-300x231.jpg 300w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/428-Figure_2-768x593.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 2: Vis-NIR absorption spectra of the three diamonds with a major band centred at ~480 nm. The spectra were collected at liquid nitrogen temperature (-196\u00b0C) Figure: SSEF.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-33214dd elementor-widget elementor-widget-spacer\" data-id=\"33214dd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e74e40a elementor-widget elementor-widget-text-editor\" data-id=\"e74e40a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tThe three diamonds are type Ia with low to moderate nitrogen content. They show hydrogen-absorption features typical of those orange and yellow diamonds coloured by the 480 nm band.\nThey contain numerous mineral inclusions ranging from micrometre to hundreds of micrometres in size. We analysed four of those inclusions that are located at or near the surface of these diamonds (Figure 3a). The Raman spectra of these inclusions clearly identify them as omphacite with the characteristic Raman main features located at ca. 340, 380,\n515, 555, 682, and 1017 cm<sup>-1<\/sup> (Figure 3b). Omphacite is a clinopyroxene representing one of the major constituents of eclogitic rocks.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fbdf908 elementor-widget elementor-widget-image\" data-id=\"fbdf908\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"494\" src=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/428-Figure_3.jpg\" class=\"attachment-large size-large wp-image-47791\" alt=\"\" srcset=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/428-Figure_3.jpg 1024w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/428-Figure_3-300x145.jpg 300w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/428-Figure_3-768x371.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 3a: An omphacite inclusion selected for Raman analysis. Photo: M. Mintrone, SSEF. Figure 3b: Raman spectra of the analysed inclusions, identifying them as omphacite with characteristic bands at ~340, 380, 515, 555, 682, and 1017 cm-1. Figure: SSEF.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-67ff021 elementor-widget elementor-widget-text-editor\" data-id=\"67ff021\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Eclogites are high-pressure metamorphic rocks that are generally formed during the subduction of an oceanic plate under a continental plate. During this process, magmatic rocks forming the oceanic plate are transformed into eclogite, while they are diving into the earth\u2019s mantle due to the pressure increase. Eclogite represents also one of the two major diamond-forming rocks as peridotite.<\/p><p>Therefore, our results suggest that those three orange-yellow diamonds were formed in eclogitic rocks probably during the subduction of an oceanic plate in the earth\u2019s mantle. These results are consistent with another study suggesting that orange-yellow diamonds coloured by the 480 nm band are related to eclogite.<\/p><p>This study illustrates the incredible story behind the natural diamond formation, in this orange-yellow diamond coloured by the 480 nm band is probably linked to plate tectonics which has facetted the appearance of our planet over the last 2.5 billion years.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>We recently acquired three orange-yellow diamonds for the SSEF collection research. These diamonds immediately retained our attention when we did the UV-vis-NIR spectra to identify the defect at the origin of their colour.<\/p>\n","protected":false},"author":10,"featured_media":47773,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[626],"tags":[725],"library_category":[],"library_author":[],"class_list":["post-47771","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-blog","tag-diamond"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Eclogitic orange-yellow diamonds coloured by the 480 nm band - SSEF<\/title>\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.ssef.ch\/eclogitic-orange-yellow-diamonds-coloured-by-the-480-nm-band\/\" \/>\n<meta property=\"og:locale\" content=\"zh_TW\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Eclogitic orange-yellow diamonds coloured by the 480 nm band - SSEF\" \/>\n<meta property=\"og:description\" content=\"We recently acquired three orange-yellow diamonds for the SSEF collection research. 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