{"id":7870,"date":"2022-04-05T11:39:18","date_gmt":"2022-04-05T09:39:18","guid":{"rendered":"https:\/\/ssef.ch\/?p=7870"},"modified":"2022-11-02T15:16:56","modified_gmt":"2022-11-02T14:16:56","slug":"dyed-corundum-from-burma","status":"publish","type":"post","link":"https:\/\/www.ssef.ch\/jp\/dyed-corundum-from-burma\/","title":{"rendered":"Dyed corundum from Burma"},"content":{"rendered":"\n

by Dr. M.S. Krzemnicki, first published in Facette 27<\/a> (June 2021)<\/p>\n\n\n\n

\"\"
Figure 1 (left):<\/strong> Dyed corundum from Burma (Myanmar), mimicking a beautiful pinkish red ruby. Photo: J. Xaysongkham, SSEF. Figure 2 (center and right):<\/strong> Fissures filled with red oil in this treated (dyed) corundum. Photos: M.S. Krzemnicki, SSEF.<\/figcaption><\/figure>\n\n\n\n

It cannot be repeated often enough: any gemstone which contains fissures is prone to be treated with fissure filling substances, either by using a colourless or coloured substances (e.g. oil). Even when the stone comes from a famed mining source such as the Mogok Stone Tract in Burma (Myanmar).<\/p>\n\n\n\n

A very instructional example was recently submitted to SSEF. This drop-shaped stone of 10 ct contained numerous fissures and visually looked like a beautiful pinkish red ruby (Figure 1). Although confirmed by EDXRF chemical analyses to be a corundum, the very low chromium concentration made its vivid colour quite suspicious. These doubts were confirmed by closer microscopic investigations which revealed, that this Burmese stone was in fact originally only a light pink sapphire which had been dyed by filling the numerous fissures with red oil (Figure 2). Infrared and UV-Vis absorption spectra (Figure 3) readily confirmed the presence of coloured oil in this treated corundum.<\/p>\n\n\n\n

\"\"
Figure 3:<\/strong> UV-Vis absorption spectra of the described dyed corundum showing the chromium related absorption bands of the pink sapphire and the absorption spectrum registered when analysing through a fissure that was filled with red oil in this specimen. Figure: R.Schmid, SSEF.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

by Dr. M.S. Krzemnicki, first published in Facette 27 (June 2021) It cannot be repeated often enough: any gemstone which contains fissures is prone to be treated with fissure filling substances, either by using a colourless or coloured substances (e.g. oil). Even when the stone comes from a famed mining source such as the Mogok Stone Tract […]<\/p>\n","protected":false},"author":9,"featured_media":8205,"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":[728,731],"library_category":[],"library_author":[],"class_list":["post-7870","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-blog","tag-ruby","tag-treatments"],"acf":[],"yoast_head":"\nDyed corundum from Burma - 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\/dyed-corundum-from-burma\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dyed corundum from Burma - SSEF\" \/>\n<meta property=\"og:description\" content=\"by Dr. M.S. Krzemnicki, first published in Facette 27 (June 2021) It cannot be repeated often enough: any gemstone which contains fissures is prone to be treated with fissure filling substances, either by using a colourless or coloured substances (e.g. oil). 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