{"id":7820,"date":"2021-04-08T15:48:53","date_gmt":"2021-04-08T10:18:53","guid":{"rendered":"https:\/\/gjepc.org\/solitaire\/?p=7820"},"modified":"2021-04-08T15:50:07","modified_gmt":"2021-04-08T10:20:07","slug":"large-type-iia-diamond-from-arkansas-usa","status":"publish","type":"post","link":"https:\/\/gjepc.org\/solitaire\/large-type-iia-diamond-from-arkansas-usa\/","title":{"rendered":"Large Type IIa Diamond from Arkansas, USA"},"content":{"rendered":"\n<p>The GIA lab in Carlsbad recently had the opportunity to examine a truly \u201call-American\u201d diamond. The 1.16 ct near-colorless cushion-cut stone was submitted for a grading report along with a certificate from Crater of Diamonds State Park in Arkansas, USA, indicating it was cut from a 2.73 ct rough diamond mined in July 2020 by William Dempsey. The diamond was reported to have been cut and polished domestically in North Dakota (see above). It was ultimately graded as H color (near colorless) with SI<sub>1<\/sub>&nbsp;clarity (due to an internal feather). Crater of Diamonds State Park is the only fee-dig diamond mine in the world where anyone with a prospector\u2019s spirit can search in hopes of finding a true gem (<a href=\"https:\/\/www.gia.edu\/gems-gemology\/summer-2020-gemnews-finders-keepers\" target=\"_blank\" rel=\"noreferrer noopener\">Summer 2020 Gem News International, \u201cFinders, keepers: Field trip to Crater of Diamonds, USA,\u201d pp. 311\u2013314<\/a>). At 2.73 ct, the rough stone was exceptionally large for an Arkansas diamond, most of which come in significantly under 1 carat.<\/p>\n\n\n\n<p>Researchers at GIA were excited to study this unique stone, especially with the prospect of analyzing inclusions that might shed light on the geological history of the Arkansas diamond deposit. However, the diamond turned out to be fairly clean with no crystalline inclusions. Somewhat unexpectedly, FTIR spectroscopy revealed the stone to be a type IIa diamond with no measurable nitrogen impurities. Type IIa diamonds are extremely rare among natural diamonds, and some have even been shown to grow much deeper in the earth than most type I diamonds (E.M. Smith et al., \u201cLarge gem diamonds from metallic liquid in Earth\u2019s deep mantle,\u201d&nbsp;<em>Science<\/em>, Vol. 354, No. 6318, pp. 1403\u20131405). The lack of inclusions in the stone was consistent with its type IIa character. Imaging with the DiamondView instrument showed relatively even blue fluorescence. Photoluminescence spectroscopy confirmed the natural origin of the diamond.<\/p>\n\n\n\n<p>Discovering a type IIa gem diamond is remarkable enough, but uncovering one from a source in the United States, where few diamonds occur, is definitely a noteworthy event.<\/p>\n\n\n\n<p>This\u00a0<a href=\"https:\/\/www.gia.edu\/gems-gemology\/winter-2020-labnotes-large-diamond-arkansas\">article<\/a>\u00a0is republished with permission from the Gemological Institute of America (GIA).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The GIA lab in Carlsbad recently had the opportunity to examine a truly \u201call-American\u201d diamond. The 1.16 ct near-colorless cushion-cut stone was submitted for a grading report along with a certificate from Crater of Diamonds State Park in Arkansas, USA, indicating it was cut from a 2.73 ct rough diamond mined in July 2020 by&hellip;<\/p>\n","protected":false},"author":1,"featured_media":7821,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96,100],"tags":[],"thb-sponsors":[],"class_list":["post-7820","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diamonds","category-in-focus"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v14.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Large Type IIa Diamond from Arkansas, USA - Solitaire magazine is a International jewellery magazine - India\u2019s leading B2B gem and jewellery magazine<\/title>\n<meta name=\"robots\" content=\"index, follow\" \/>\n<meta name=\"googlebot\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta name=\"bingbot\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gjepc.org\/solitaire\/large-type-iia-diamond-from-arkansas-usa\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Large Type IIa Diamond from Arkansas, USA - Solitaire magazine is a International jewellery magazine - India\u2019s leading B2B gem and jewellery magazine\" \/>\n<meta property=\"og:description\" content=\"The GIA lab in Carlsbad recently had the opportunity to examine a truly \u201call-American\u201d diamond. The 1.16 ct near-colorless cushion-cut stone was submitted for a grading report along with a certificate from Crater of Diamonds State Park in Arkansas, USA, indicating it was cut from a 2.73 ct rough diamond mined in July 2020 by&hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/gjepc.org\/solitaire\/large-type-iia-diamond-from-arkansas-usa\/\" \/>\n<meta property=\"og:site_name\" content=\"Solitaire magazine is a International jewellery magazine - India\u2019s leading B2B gem and jewellery magazine\" \/>\n<meta property=\"article:published_time\" content=\"2021-04-08T10:18:53+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-04-08T10:20:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/gjepc.org\/solitaire\/wp-content\/uploads\/2021\/04\/WN20-LN-Fig1-263241-636px.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"636\" \/>\n\t<meta property=\"og:image:height\" content=\"358\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/gjepc.org\/solitaire\/#website\",\"url\":\"https:\/\/gjepc.org\/solitaire\/\",\"name\":\"Solitaire magazine is a International jewellery magazine - India\\u2019s leading B2B gem and jewellery magazine\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":\"https:\/\/gjepc.org\/solitaire\/?s={search_term_string}\",\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/gjepc.org\/solitaire\/large-type-iia-diamond-from-arkansas-usa\/#primaryimage\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/gjepc.org\/solitaire\/wp-content\/uploads\/2021\/04\/WN20-LN-Fig1-263241-636px.jpg\",\"width\":636,\"height\":358,\"caption\":\"A 1.16 ct type IIa diamond recovered in 2020 from Crater of Diamonds State Park in Arkansas.\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/gjepc.org\/solitaire\/large-type-iia-diamond-from-arkansas-usa\/#webpage\",\"url\":\"https:\/\/gjepc.org\/solitaire\/large-type-iia-diamond-from-arkansas-usa\/\",\"name\":\"Large Type IIa Diamond from Arkansas, USA - Solitaire magazine is a International jewellery magazine - India\\u2019s leading B2B gem and jewellery magazine\",\"isPartOf\":{\"@id\":\"https:\/\/gjepc.org\/solitaire\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/gjepc.org\/solitaire\/large-type-iia-diamond-from-arkansas-usa\/#primaryimage\"},\"datePublished\":\"2021-04-08T10:18:53+00:00\",\"dateModified\":\"2021-04-08T10:20:07+00:00\",\"author\":{\"@id\":\"https:\/\/gjepc.org\/solitaire\/#\/schema\/person\/b614a6d604f6c36c387b4c876bb33d79\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/gjepc.org\/solitaire\/large-type-iia-diamond-from-arkansas-usa\/\"]}]},{\"@type\":[\"Person\"],\"@id\":\"https:\/\/gjepc.org\/solitaire\/#\/schema\/person\/b614a6d604f6c36c387b4c876bb33d79\",\"name\":\"GJEPC\",\"image\":{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/gjepc.org\/solitaire\/#personlogo\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/f6c5b479a8ec14da0f88385e2b6cd51ccb37ac80c31409ecaebe5524700952a2?s=96&d=mm&r=g\",\"caption\":\"GJEPC\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","_links":{"self":[{"href":"https:\/\/gjepc.org\/solitaire\/wp-json\/wp\/v2\/posts\/7820","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gjepc.org\/solitaire\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gjepc.org\/solitaire\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gjepc.org\/solitaire\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gjepc.org\/solitaire\/wp-json\/wp\/v2\/comments?post=7820"}],"version-history":[{"count":2,"href":"https:\/\/gjepc.org\/solitaire\/wp-json\/wp\/v2\/posts\/7820\/revisions"}],"predecessor-version":[{"id":7823,"href":"https:\/\/gjepc.org\/solitaire\/wp-json\/wp\/v2\/posts\/7820\/revisions\/7823"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gjepc.org\/solitaire\/wp-json\/wp\/v2\/media\/7821"}],"wp:attachment":[{"href":"https:\/\/gjepc.org\/solitaire\/wp-json\/wp\/v2\/media?parent=7820"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gjepc.org\/solitaire\/wp-json\/wp\/v2\/categories?post=7820"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gjepc.org\/solitaire\/wp-json\/wp\/v2\/tags?post=7820"},{"taxonomy":"thb-sponsors","embeddable":true,"href":"https:\/\/gjepc.org\/solitaire\/wp-json\/wp\/v2\/thb-sponsors?post=7820"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}