{"id":32525,"date":"2023-06-30T17:27:18","date_gmt":"2023-06-30T15:27:18","guid":{"rendered":"https:\/\/ssef.ch\/?p=32525"},"modified":"2023-09-21T15:28:21","modified_gmt":"2023-09-21T13:28:21","slug":"saltwater-pearl-with-barium","status":"publish","type":"post","link":"https:\/\/www.ssef.ch\/zh-hant\/saltwater-pearl-with-barium\/","title":{"rendered":"Saltwater pearl with barium"},"content":{"rendered":"\t\t
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by Dr. M.S. Krzemnicki, first published in Facette 28<\/a> (May 2023)<\/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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Figure 1: Antique pearl necklace with a \u201cpearl\u201d in the centre, assembled from a blister with a polished piece of shell at the base. Photo: A. Chalain, 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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\n\t\t\t\t\t\t\t\t\tRecently, the SSEF received a button-shaped pearl of 7.5 ct for testing. Based on X-ray radiography and a UV-Vis-NIR reflectance spectrum, the pearl was easily identified as a saltwater natural pearl from the species Pinctada margaritifera. Strangely enough however, this pearl showed a distinct concentration of barium (approx. 350 ppm), an element commonly found in freshwater pearls but only at very low trace levels (about 1 ppm or below) in saltwater pearls. We assume that the presence of barium in this specific pearl might be a residue from a former X-ray radiography performed with an X-ray absorber liquid containing barium. The admixture of barium sulfate to water is applied in medical X-ray radiography since many years with the aim to increase the visibility of internal features.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Want to learn more about pearls?<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Start your journey to becoming an pearl expert with our free online course “Introduction to pearls”.<\/h4>

Learn all about pearls. Their fascinating history, how they form, where they come from. Learn about all the different origins of pearls and their treatments. Take this course as an introduction to the wonderful world of pearls.<\/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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\n\t\t\t\t\t\n\tDiscover the course<\/span>\n<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Recently, the SSEF received a button-shaped pearl of 7.5 ct for testing. Based on X-ray radiography and a UV-Vis-NIR reflectance spectrum, the pearl was easily identified as a saltwater natural pearl from the species Pinctada margaritifera.<\/p>\n","protected":false},"author":3,"featured_media":32528,"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":[724],"library_category":[],"library_author":[],"class_list":["post-32525","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-blog","tag-pearl"],"acf":[],"yoast_head":"\nSaltwater pearl with barium - 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\/saltwater-pearl-with-barium\/\" \/>\n<meta property=\"og:locale\" content=\"zh_TW\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Saltwater pearl with barium - SSEF\" \/>\n<meta property=\"og:description\" content=\"Recently, the SSEF received a button-shaped pearl of 7.5 ct for testing. 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