{"id":47801,"date":"2026-04-30T11:05:55","date_gmt":"2026-04-30T09:05:55","guid":{"rendered":"https:\/\/www.ssef.ch\/?p=47801"},"modified":"2026-04-30T11:05:55","modified_gmt":"2026-04-30T09:05:55","slug":"cvd-synthetic-diamond-with-colour-shift","status":"publish","type":"post","link":"https:\/\/www.ssef.ch\/de\/cvd-synthetic-diamond-with-colour-shift\/","title":{"rendered":"CVD synthetic diamond with colour shift"},"content":{"rendered":"\t\t
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By Dr. Michael Mintrone & Julia Griffith, first published in 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

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Last November, the SSEF received an interesting round brilliant colourless (with a greyish tint) diamond of ca. 0.7 ct. mounted on an earring for testing.<\/p>

After preliminary tests, this diamond was identified as a type IIa by infrared spectroscopy and showed a strain birefringence pattern between crossed polarizing filters. However, these first tests alone do not allow to conclude if this diamond was natural or a CVD synthetic.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Figure 1: Deep-UV imaging of the CVD diamond showing the characteristic green fluorescence of high-temperature-treated CVD. 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
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This diamond was then observed under deep UV light (i.e., 225 nm) to observe its fluorescence reaction. The diamond exhibits a dominant green fluorescence colour with striations and planes fluorescing blue attributed to dislocations (Figure 1). The combination of green fluorescence colour and striations indicates a potential CVD synthetic. Surprisingly, after its exposure to deep UV, the diamond colour changed from colourless (greyish tint) to blueish-grey (Figure 2). This photochromic effect is not known for natural diamonds but is described in rare CVD synthetics.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Figure 2: Comparison of the colour of the CVD diamond under daylight conditions, before and after exposure to deep-UV light. 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
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To understand this photochromic effect, we recorded UV-vis-NIR spectra at liquid nitrogen temperature (ca. -196 \u00b0C) before and after UV exposure (Figure 3). Both spectra confirm that this diamond is a CVD synthetic, as testified by the strong absorption of the SiV- at 737 nm, a typical defect of CVD diamond (Figure 3). We also note that after UV exposure SiV- peak decreases by ca. 20% in intensity and that the absorption slope between 400 \u2013 450 nm is flattened compared to the spectra without UV exposition, allowing more blue light to be transmitted and hence giving a blueish coloration to the CVD synthetic diamond (Figure 3).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Figure 3: Vis-NIR absorption spectra of the CVD diamond before and after exposure to deep-UV light. The spectra were collected at liquid nitrogen temperature (-196\u00b0C). Spectra: 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
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CVDs showing a similar photochromic effect were recently mentioned in the last update on lab-grown diamonds performed by the GIA (Maga\u00f1a et al., 2024). The colour change is explained as a charge transfer increasing the intensity of the SiV0 (946 nm) at the expense of the SiV- at 737 nm. Those CVDs are thought to be intentionally doped in silicon to get a greyish-to-pink coloration.<\/p>

This type of CVD synthetic is interesting for SSEF as it allows us to improve our understanding of the behaviour of defects present in synthetic diamonds.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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References<\/h4>

Maga\u00f1a, S. E., Hardman, M. F., Shoko, O., 2024. Laboratory-grown diamonds: an update on identification and products evaluated at GIA. Gems & Gemology, Vol. 60, No. 2, pp. 146\u2013167, http:\/\/dx.doi.org\/10.5741\/ GEMS.60.2.146<\/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":"

Last November, the SSEF received an interesting round brilliant colourless (with a greyish tint) diamond of ca. 0.7 ct. mounted on an earring for testing.<\/p>\n","protected":false},"author":10,"featured_media":47803,"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-47801","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-blog","tag-diamond"],"acf":[],"yoast_head":"\nCVD synthetic diamond with colour shift - 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\/cvd-synthetic-diamond-with-colour-shift\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CVD synthetic diamond with colour shift - 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