[{"data":1,"prerenderedAt":325},["ShallowReactive",2],{"header-nav-data":3,"paper-zh-recrystallization-of-baddeleyite-as-an-indicator-of-pht-hpht-treatment-in-sapphire":269,"related-papers-zh":294},{"reports":4,"labs":108,"courses":226},[5,35,54,72,90],{"id":6,"slug":7,"name":8,"name_zh":9,"tagline":10,"tagline_zh":11,"category":12,"category_zh":12,"is_published":13,"sort_order":14,"created_at":15,"last_updated_at":16,"available_categories":17,"available_locations":21,"images":26},5,"guild-folio","GUILD FOLIO","高级报告","FOLIO Report is a professionally profound and uniquely insightful gemological document, meticulously bespoke for collector-grade jewelry and presented as a premium, book-bound masterpiece within an elegant gift box.","FOLIO 报告是一份具有专业深度和独特见解的宝石学报告，为收藏级珠宝精心定制，并以高级精装书卷的形式呈现在优雅的礼盒中。",null,true,70,"2026-02-06T11:31:22","2026-03-30T17:25:34",[18,19,20],"colored-stones","feicui","pearl",[22,23,24,25],"china-mainland","thailand","sri-lanka","hongkong",[27,31],{"id":28,"image_url":29,"image_type":30},10,"https://project-static.guildgemedu.com/project/b85464b6-14f4-4346-8fe3-4fbb30faf542.png","transparent_clean_shot",{"id":32,"image_url":33,"image_type":34},16,"https://project-static.guildgemedu.com/project/1aadc859-3c3f-43cc-80ac-318a4d52b457.jpg","atmospheric_contextual",{"id":36,"slug":37,"name":38,"name_zh":39,"tagline":40,"tagline_zh":41,"category":12,"category_zh":12,"is_published":13,"sort_order":42,"created_at":43,"last_updated_at":44,"available_categories":45,"available_locations":46,"images":47},1,"standard-report","Standard Report","常规检测报告","Standard Report provides a versatile diagnostic framework for all colored gemstone varieties, delivering critical data on identification, treatment status, and color grading to establish a comprehensive profile for every specimen.","常规报告为彩色宝石品种提供了一个多功能的鉴定框架，提供关于鉴定、优化处理和颜色分级的关键数据，为每一颗标本建立全面的档案。",50,"2026-02-06T11:07:09","2026-03-30T17:18:27",[18,19],[23,24,25,22],[48,51],{"id":49,"image_url":50,"image_type":30},13,"https://project-static.guildgemedu.com/project/72303f7d-3498-4f8f-b084-dfdd23a8cb88.png",{"id":52,"image_url":53,"image_type":34},14,"https://project-static.guildgemedu.com/project/b3bbc130-04c4-477f-81d9-512ba6491353.jpg",{"id":55,"slug":56,"name":57,"name_zh":58,"tagline":59,"tagline_zh":60,"category":12,"category_zh":12,"is_published":13,"sort_order":61,"created_at":62,"last_updated_at":63,"available_categories":64,"available_locations":65,"images":66},3,"pearl-grading-report","Pearl Grading Report","珍珠分级鉴定报告","It offers a comprehensive gemological analysis for all pearl categories, featuring a structured four-part layout—Certificate Information, Pearl Information, Identification Details, and Key Conclusions—to cover every essential detail for buyers.","该报告为所有珍珠类别提供全面的宝石学分析，采用结构化的四部分布局——证书信息、珍珠信息、检测细节和关键结论——涵盖消费者关注的每一个核心细节。",30,"2026-02-06T11:25:33","2026-03-30T17:22:39",[20],[22],[67,69],{"id":6,"image_url":68,"image_type":34},"https://project-static.guildgemedu.com/project/b6d3b2d1-cdd9-42dd-be4d-75ded1bfae09.jpg",{"id":70,"image_url":71,"image_type":30},6,"https://project-static.guildgemedu.com/project/6c4c7330-51e8-4b2e-af46-f217e3a6e0e5.png",{"id":73,"slug":74,"name":75,"name_zh":76,"tagline":77,"tagline_zh":78,"category":12,"category_zh":12,"is_published":13,"sort_order":79,"created_at":80,"last_updated_at":81,"available_categories":82,"available_locations":83,"images":84},2,"dossier-report","Dossier Report","Dossier报告","Dossier Report is a streamlined gemological document specifically engineered for colored stones under one carat, offering highly efficient identification, color grading, and origin determination across all gemstone varieties.","Dossier 报告是专为一克拉以下的彩色宝石设计的精简版宝石证书，为各类宝石提供高效的鉴定、颜色分级和产地鉴定服务。",25,"2026-02-06T11:22:28","2026-03-30T17:21:00",[18],[22,23,24,25],[85,87],{"id":55,"image_url":86,"image_type":34},"https://project-static.guildgemedu.com/project/77d5bd95-75cd-423d-aea9-0f276bee3e61.jpg",{"id":88,"image_url":89,"image_type":30},4,"https://project-static.guildgemedu.com/project/bfca818a-3561-4679-8b22-e1da9bf98dd5.png",{"id":70,"slug":91,"name":92,"name_zh":93,"tagline":94,"tagline_zh":95,"category":12,"category_zh":12,"is_published":13,"sort_order":96,"created_at":97,"last_updated_at":98,"available_categories":99,"available_locations":100,"images":101},"prestige-report","Prestige Report","尊享报告","GUILD Prestige Report is a sophisticated gemological document tailored for high-end colored stones and pearls, offering a deep-dive analysis of a gemstone’s aesthetic dimensions and providing a unique, individualized evaluation for every specimen.","GUILD 尊享报告是为高端彩色宝石和珍珠量身定制的高级宝石报告，提供对宝石美学维度的深度分析，并为每一件标本提供独特的个体化评价。",20,"2026-02-06T11:33:19","2026-03-30T17:47:36",[18,19],[22,23,24,25],[102,105],{"id":103,"image_url":104,"image_type":34},11,"https://project-static.guildgemedu.com/project/10ac604a-d1c2-49f4-bafe-24ada49cfaa0.jpg",{"id":106,"image_url":107,"image_type":30},12,"https://project-static.guildgemedu.com/project/3fd95c04-17fe-40e1-a57e-181f838d6211.png",[109,129,147,162,178,194,209],{"id":36,"lab_id":110,"name":111,"name_zh":112,"city":113,"city_zh":114,"country":115,"country_zh":116,"address":117,"address_zh":117,"phone":118,"email":119,"working_hours":120,"working_hours_zh":120,"cover_image_url":121,"city_image_url":122,"interior_images":123,"is_published":13,"sort_order":126,"created_at":127,"last_updated_at":128},"sri-lanka-laboratory","Sri Lanka Laboratory","斯里兰卡实验室","Beruwala","贝鲁瓦拉","Sri Lanka","斯里兰卡","3/4/5/6 Floor, Zam Gems Building, 44/1, Sheik Fassy Mawatha, China Fort, Beruwala, Sri Lanka","+0094 342214443","info@guildgemlab.com","","https://project-static.guildgemedu.com/project/bbf95b5c-699a-4aa1-9e2e-37650d1df384.jpg","https://project-static.guildgemedu.com/project/07415349-1198-4c45-b855-1c0baf069e4b.png",[124,125],"https://project-static.guildgemedu.com/project/1ecc8af1-f6b1-406d-9c56-f232e1606e3c.png","https://project-static.guildgemedu.com/project/0be76daf-5ca6-47ac-88e8-3e1405d5c35b.png",60,"2026-03-10T17:00:14","2026-03-17T16:57:14",{"id":70,"lab_id":130,"name":131,"name_zh":132,"city":133,"city_zh":134,"country":135,"country_zh":136,"address":137,"address_zh":138,"phone":139,"email":140,"working_hours":120,"working_hours_zh":120,"cover_image_url":141,"city_image_url":142,"interior_images":143,"is_published":13,"sort_order":144,"created_at":145,"last_updated_at":146},"bangkok-laboratory","Bangkok Laboratory","曼谷实验室","Bangkok","曼谷","Thailand","泰国","Room No. B25BC, B1 floor, Jewelry Trade Center (JTC) Building, 919/1 Si Lom Rd, Silom, Bang Rak, Bangkok, Thailand","Room No. B25BC, B1 floor, Jewelry Trade Center (JTC) Building, 919/1 Silom road, Silom, Bangrak, Bangkok, Thailand., 10500","+66 (0) 21265408","fangjuan@guildgemlab.com","https://project-static.guildgemedu.com/project/92c49c5b-75c7-4adf-ae2b-fdf21b930dec.png","https://project-static.guildgemedu.com/project/2b1c353d-5f67-42a3-814a-8337de6f70e1.jpg",[],35,"2026-03-10T17:14:49","2026-03-16T16:44:33",{"id":73,"lab_id":148,"name":149,"name_zh":150,"city":151,"city_zh":152,"country":153,"country_zh":154,"address":155,"address_zh":155,"phone":156,"email":119,"working_hours":120,"working_hours_zh":120,"cover_image_url":157,"city_image_url":158,"interior_images":159,"is_published":13,"sort_order":61,"created_at":160,"last_updated_at":161},"los-angeles-laboratory","Los Angeles Laboratory","洛杉矶实验室","Los Angeles","洛杉矶","United States","美国","550 South Hill Street, Suite 1188, Los Angeles, CA90013, USA","+1 2136240137","https://project-static.guildgemedu.com/project/ea476e65-bb43-4ce4-8189-133c794a861a.jpg","https://project-static.guildgemedu.com/project/b6153020-c94c-4bcc-9df9-0fc39e5d9fd2.jpg",[],"2026-03-10T17:01:22","2026-03-17T16:57:45",{"id":55,"lab_id":163,"name":164,"name_zh":165,"city":166,"city_zh":167,"country":168,"country_zh":169,"address":170,"address_zh":171,"phone":172,"email":119,"working_hours":120,"working_hours_zh":120,"cover_image_url":173,"city_image_url":174,"interior_images":175,"is_published":13,"sort_order":79,"created_at":176,"last_updated_at":177},"hong-kong-laboratory","Hong Kong Laboratory","香港实验室","Hong Kong","香港","China","中国","Flat 512B,Fu Hang Industrial Building, 1 Hok Yuen Street East, Hung Hom, Kowloon City District, Hong Kong Special Administrative Region","香港九龙城区红磡鹤园东街1号富恒工业大厦512B室","+852 59751280","https://project-static.guildgemedu.com/project/a8009f44-a00a-406c-9a76-b690abb00f16.jpg","https://project-static.guildgemedu.com/project/e69f75d5-665f-4536-82ce-3590737f11d2.jpg",[],"2026-03-10T17:05:06","2026-03-19T09:42:21",{"id":88,"lab_id":179,"name":180,"name_zh":181,"city":182,"city_zh":183,"country":168,"country_zh":169,"address":184,"address_zh":185,"phone":186,"email":119,"working_hours":120,"working_hours_zh":120,"cover_image_url":187,"city_image_url":188,"interior_images":189,"is_published":13,"sort_order":191,"created_at":192,"last_updated_at":193},"shenzhen-laboratory","Shenzhen Laboratory","深圳实验室","Shenzhen","深圳","Room 3C08, Addcon Building, Shuibei 1st Road, Luohu District, Shenzhen, Guangdong Province, China","深圳市 罗湖区 翠竹街道 翠锦社区 翠竹路 2099号 爱得康大厦 三层 C08","+86 4008866175","https://project-static.guildgemedu.com/project/bbe15c7b-ced1-41e2-bd1e-ce12300e662b.jpg","https://project-static.guildgemedu.com/project/d0f51c46-8cdf-4505-a1b5-e75ec1cdb561.jpg",[190],"https://project-static.guildgemedu.com/project/f215d30f-ea6c-4b5f-beb6-793cffbcf0ca.png",23,"2026-03-10T17:10:22","2026-03-17T17:29:01",{"id":6,"lab_id":195,"name":196,"name_zh":197,"city":198,"city_zh":199,"country":168,"country_zh":169,"address":200,"address_zh":201,"phone":202,"email":119,"working_hours":120,"working_hours_zh":120,"cover_image_url":203,"city_image_url":204,"interior_images":205,"is_published":13,"sort_order":96,"created_at":207,"last_updated_at":208},"zhuji-laboratory","Zhuji Laboratory","诸暨实验室","Zhuji","诸暨","Rooms B0419-B0421,  Building B04,  Phase 1 Market,  East China International Jewelry City,  Shanxiahu Town, Zhuji City, Shaoxing City, Zhejiang Province, China","浙江省 绍兴市 诸暨市 山下湖镇 华东国际珠宝城一期市场 B04栋 B0419-B0421","+86 133 0231 0256","https://project-static.guildgemedu.com/project/b6778c28-4699-4fce-82ad-4fea005d3404.jpg","https://project-static.guildgemedu.com/project/6bd5b54f-9299-4218-9e48-5fb50140a83d.jpg",[206],"https://project-static.guildgemedu.com/project/ab2a559d-a0bb-4272-bed5-d9616e921a0d.png","2026-03-10T17:12:13","2026-03-20T15:25:06",{"id":210,"lab_id":211,"name":212,"name_zh":213,"city":214,"city_zh":215,"country":168,"country_zh":169,"address":216,"address_zh":217,"phone":218,"email":119,"working_hours":120,"working_hours_zh":120,"cover_image_url":219,"city_image_url":220,"interior_images":221,"is_published":13,"sort_order":96,"created_at":224,"last_updated_at":225},7,"guangzhou-laboratory","Guangzhou Laboratory","广州实验室","Guangzhou","广州","Room 4095, Blue Port International Jewelry Trade Center, No. 300 Kangwang Middle Road, Liwan District, Guangzhou, Guangdong Province, China","广州市 荔湾区 康王中路 蓝港（国际）珠宝交易中心 4楼 4095","+86 181 3828 3849","https://project-static.guildgemedu.com/project/3f79c542-bf42-4dff-b1de-7d5281f42555.png","https://project-static.guildgemedu.com/project/43c9bae4-82b4-4c55-a39f-20f96ff606be.jpg",[222,223],"https://project-static.guildgemedu.com/project/c4d31919-3230-42a9-9fab-e00775bc93d2.jpg","https://project-static.guildgemedu.com/project/d69902ea-0d71-4d3c-bbfd-72bfe1f19057.jpg","2026-03-10T17:19:56","2026-03-20T17:41:24",[227,238,250,259],{"id":36,"slug":228,"level":229,"title":230,"title_en":231,"subtitle":232,"subtitle_en":233,"image_url":234,"duration":235,"curriculum_count":210,"is_published":13,"sort_order":42,"created_at":236,"last_updated_at":237},"advanced-emerald-identification-and-evaluation","intermediate","祖母绿鉴定与评估课程","Emerald Identification and Evaluation","深入探索祖母绿的奥秘世界","Deep Dive into the Mystical World of Emeralds","https://strict-static.guildgemedu.com/gallery/k07Y_1761530161.jpg","6","2026-03-10T15:14:21","2026-03-30T11:07:34",{"id":239,"slug":240,"level":241,"title":242,"title_en":243,"subtitle":244,"subtitle_en":245,"image_url":246,"duration":235,"curriculum_count":210,"is_published":13,"sort_order":247,"created_at":248,"last_updated_at":249},9,"ruby-and-sapphire-identification-and-evaluation","advanced","红宝石与蓝宝石鉴定与评估课程","Ruby and Sapphire Identification and Evaluation","掌握刚玉宝石的鉴定精髓","Master the Essence of Corundum Gemstone Identification","https://strict-static.guildgemedu.com/gallery/6TEe_1761529854.jpg",40,"2026-03-10T15:19:30","2026-03-30T11:27:47",{"id":73,"slug":251,"level":241,"title":252,"title_en":253,"subtitle":254,"subtitle_en":255,"image_url":256,"duration":235,"curriculum_count":70,"is_published":13,"sort_order":61,"created_at":257,"last_updated_at":258},"colored-stones-identification-and-evaluation","彩色宝石鉴定与评估课程","Colored Stones Identification and Evaluation","探索彩色宝石的璀璨世界","Explore the Brilliant World of Colored Gemstones","https://strict-static.guildgemedu.com/news/news-hero-header-image.jpg","2026-03-10T15:15:51","2026-03-30T11:29:55",{"id":210,"slug":260,"level":241,"title":261,"title_en":262,"subtitle":263,"subtitle_en":264,"image_url":265,"duration":266,"curriculum_count":70,"is_published":13,"sort_order":96,"created_at":267,"last_updated_at":268},"pearls-identification-and-evaluation","珍珠鉴定与评估课程","Pearls Identification and Evaluation","揭开珍珠的优雅密码","Unlock the Elegant Secrets of Pearls","https://strict-static.guildgemedu.com/gallery/VaLd_1761529495.jpg","4","2026-03-10T15:19:14","2026-03-30T11:31:40",{"slug":270,"content_type_name":271,"is_zh_open":13,"is_en_open":13,"title":272,"content":273,"excerpt":274,"title_en":272,"content_en":273,"excerpt_en":274,"featured_image_url":275,"cover_position":276,"is_featured":277,"is_published":13,"published_at":278,"published_by_name":279,"authors":280,"venue":281,"paper_published_date":282,"citation":283,"paper_type":284,"last_updated_at":285,"last_updated_by_name":279,"id":239,"created_at":282,"is_deleted":277,"external_links":286,"attachments":290},"recrystallization-of-baddeleyite-as-an-indicator-of-pht-hpht-treatment-in-sapphire","papers","Recrystallization of Baddeleyite as an Indicator of PHT (“HPHT”) Treatment in Sapphire","{\"blocks\":[{\"id\":\"1hh49ii04\",\"type\":\"paragraph\",\"data\":{\"text\":\"PHT (“HPHT”) treatment in sapphire has been a controversial topic the last few years. Recently, Guild Gem Laboratories in Shenzhen received a 7.11 ct blue sapphire (figure 1) for identification. The refractive index of 1.762–1.770 and hydrostatic specific gravity of 4.00 confirmed the stone’s identity. It was inert under long-wave and short-wave UV. Microscopic examination revealed several distinct features, such as diffuse color bands and melted white solid mineral inclusions surrounded by discoid fractures, indicating that this stone had undergone thermal enhancement (figure 2).\"}},{\"id\":\"u83cxmijw\",\"type\":\"image\",\"data\":{\"src\":\"https://project-static.guildgemedu.com/project/6a18aa20-e3e1-461e-9e31-a3cea1ef0732.jpg\",\"caption\":\"Figure 1. This 7.11 ct oval blue sapphire, measuring 11.66×10.44×7.38 mm, exhibits eye-visible white mineral inclusions. Photo by Yizhi Zhao.\",\"copyright\":\"\",\"width\":\"100%\"}},{\"id\":\"58f8nfctg\",\"type\":\"image\",\"data\":{\"src\":\"https://project-static.guildgemedu.com/project/4a41fcd7-ea39-4984-a5d0-2ed537eef232.jpg\",\"caption\":\"Figure 2. Blurred blue color zoning and melted white solid mineral inclusions surrounded by discoid fractures. Photo by Yujie Gao; field of view 5.26 mm.\",\"copyright\":\"\",\"width\":\"100%\"}},{\"id\":\"62xxwzbre\",\"type\":\"paragraph\",\"data\":{\"text\":\"Further UV-Vis spectroscopic testing specified a metamorphic geological origin, while energy-dispersive X-ray fluorescence (EDXRF) analysis revealed low Fe content around 400–600 ppm. FTIR spectra (figure 3) showed a distinct 3309 cm–1 series at 3181 and 3373 cm–1, consistent with heated metamorphic sapphire. We also noticed a broad band centered at 3042 cm–1, accompanied by peaks at 2627, 2412, 2349, 2319, and 2096 cm–1. According to previous reports (S.-K. Kim et al., “Gem Notes: HPHT-treated blue sapphire: An update,” Journal of Gemmology, Vol. 35, No. 3, 2016, pp. 208–210; A. Peretti et al., “Identification and characteristics of PHT (‘HPHT’) - treated sapphires–An update of the GRS research progress,” 2018, http://gemresearch.ch/hpht-update), the ~3042 cm–1 series band is diagnostic of sapphire treated by a high-pressure, high-temperature process.\"}},{\"id\":\"y377e6uet\",\"type\":\"image\",\"data\":{\"src\":\"https://project-static.guildgemedu.com/project/d2205bd3-e0ae-4dbf-988c-0021900ba847.png\",\"caption\":\"Figure 3. FTIR spectra of conventionally heated sapphire and the HPHT sapphire in figure 1. The latter showed distinct bands centered around 3042 cm–1, accompanied by peaks at 2627, 2412, 2349, 2319, and 2096 cm–1.\",\"copyright\":\"\",\"width\":\"100%\"}},{\"id\":\"9803kbdqp\",\"type\":\"paragraph\",\"data\":{\"text\":\"As shown in figure 4, the mineral inclusions melted and solidified within the surrounding discoid fractures, exhibiting a dendritic appearance. Micro-Raman spectra analysis on the white mineral and recrystallized dendritic inclusions using 473 nm laser excitation produced some interesting results. The white melted minerals and the recrystallized inclusion showed almost the same peaks in the region of 1000–100 cm–1, suggesting that they were the same mineral. Peaks at 641, 560, 541, 475, 334, and 221 cm–1 and a characteristic doublet at 188/178 cm–1 matched with the Raman spectrum for baddeleyite (a rare zirconium oxide mineral), according to the RRUFF database, as shown in figure 5.\"}},{\"id\":\"6rpr35r0v\",\"type\":\"image\",\"data\":{\"src\":\"https://project-static.guildgemedu.com/project/d5cd9a4a-2a46-42e4-959c-91a82cfc578a.jpg\",\"caption\":\"Figure 4. Discoid fractures were oriented in almost the same direction within the sapphire host. Photomicrograph by Yujie Gao; field of view 2.28 mm.\",\"copyright\":\"\",\"width\":\"100%\"}},{\"id\":\"s85bcyu09\",\"type\":\"image\",\"data\":{\"src\":\"https://project-static.guildgemedu.com/project/287fdf42-4891-4e7a-a626-2f3e852000a5.png\",\"caption\":\"Figure 40. Raman spectra of the white mineral and dendritic inclusion both matched with baddeleyite (ZrO2).\",\"copyright\":\"\",\"width\":\"100%\"}},{\"id\":\"w6eg3rc5t\",\"type\":\"paragraph\",\"data\":{\"text\":\"Zircon (ZrSiO4) is known as a common inclusion in sapphires, which may undergo solid state thermal dissociation to zirconia and silica at extreme conditions such as high temperature and/or high pressure as follows:\"}},{\"id\":\"9lgdajp4z\",\"type\":\"paragraph\",\"data\":{\"text\":\"ZrSiO4 (zircon)    ->   ZrO2 (baddeleyite) + SiO2\"}},{\"id\":\"dhn52tf4h\",\"type\":\"paragraph\",\"data\":{\"text\":\"Baddeleyite, a monoclinic polymorph of zirconia, forms at relatively high pressure (up to about 7 GPa). W. Wang et al. (“The effects of heat treatment on zircon inclusions in Madagascar sapphires,” Summer 2006 G&G, pp. 134–150) confirmed the existence of baddeleyite with zircon in heated blue sapphire by detecting a 188/178 cm–1 Raman doublet of baddeleyite in melted zircon after heating at around 1400–1700°C and normal pressure. The results of Wang et al. (2006) suggest that when using conventional heating techniques, only a small fraction of zircon transforms into baddeleyite, while most of the zircon inclusions keep their crystalline structure intact without any phase transformation. Based on our Raman testing, however, no zircon was found in this 7.11 ct sapphire, and spectra of both the white mineral at the center and the recrystallized minerals in the fracture were consistent with baddeleyite.\"}},{\"id\":\"wz6bil6um\",\"type\":\"paragraph\",\"data\":{\"text\":\"Additionally, we also noticed several fractures filled with baddeleyite in a uniform orientation (again, see figure 4). Using a polariscope and a conoscope under a microscope, we confirmed that these fractures occurred along the basal plane (0001) of the sapphire.\"}},{\"id\":\"3ajdkz0la\",\"type\":\"paragraph\",\"data\":{\"text\":\"One question is whether these flat fractures already existed from parting before treatment (which is commonly encountered in sapphire) or formed during treatment. It is known that parting may occur along the basal plane of sapphire under certain situations, such as twinning or exsolution of inclusions. Neither distinct twinning nor exsolved inclusions were found, and almost all of the fractures were fully filled, leaving no empty space within them. Thus, we believe that these fractures could have been triggered by treatment. The proposed occurrence and healing process of these fractures are illustrated in figure 6.\"}},{\"id\":\"arokgmf98\",\"type\":\"image\",\"data\":{\"src\":\"https://project-static.guildgemedu.com/project/612b738a-4c35-4b94-a30c-1821d54b7b10.jpg\",\"caption\":\"Figure 6. The occurrence and healing process of discoid fractures in the sapphire during treatment. A: Zircon inclusions and blue color bands in the sapphire. B: Under high pressure and high temperature, progressive decomposition of zircon results in the formation of baddeleyite and flat fractures. C: Baddeleyite penetrates into the discoid and fills the fracture with no space left. D: Baddeleyite recrystallizes in a dendritic pattern shown by the red line. Illustrations by Xueying Sun.\",\"copyright\":\"\",\"width\":\"100%\"}},{\"id\":\"ww1n3eg5s\",\"type\":\"paragraph\",\"data\":{\"text\":\"In conclusion, we can appropriately speculate that PHT (“HPHT”) treatment might cause flat fractures along the basal plane and facilitate the transformation from zircon to baddeleyite. The high baddeleyite content in heated sapphire may serve as a good indicator of PHT (“HPHT”) treatment. Further experiments are needed to support this argument.\"}},{\"id\":\"3pes2dyfv\",\"type\":\"paragraph\",\"data\":{\"text\":\"Xueying Sun (shirley.sun@guildgemlab.com) Yujie Gao\"}},{\"id\":\"wy13eecxt\",\"type\":\"paragraph\",\"data\":{\"text\":\"Guild Gem Laboratories, Shenzhen, China\"}}]}","Recrystallization of baddeleyite as an indicator of PHT(“HPHT”) treatment in sapphire. PHT (“HPHT”) treatment in sapphire has been a controversial topic the last few years. Recently, Guild Gem Laborat...","https://project-static.guildgemedu.com/project/7d9d464d-f8c2-47af-b6f8-666219c6b2e8.jpg","center",false,"2026-02-03T15:26:52","samuel","Sun X.Y., Gao Y.J.","Gems & Gemology","2019-09-01T00:00:00","Sun X.Y., Gao Y.J. (2019) Recrystallization of Baddeleyite as an Indicator of PHT (“HPHT”) Treatment in Sapphire. Gems & Gemology, Vol. 55, No. 3, pp. 448-450.","journal","2026-05-27T10:46:20",[287],{"id":70,"url":288,"title":289},"https://www.gia.edu/gems-gemology/fall-2019-gemnews-recrystallization-baddeleyite-indicator","GIA",[291],{"id":70,"url":292,"name":293},"https://project-static.guildgemedu.com/project/b188e978-1cc5-42b2-a62f-bb84c77f4406.pdf","2019_Recrystallization of Baddeleyite as an Indicator of PHT HPHT Treatment.pdf",[295,311],{"id":126,"slug":296,"content_type":271,"title":297,"title_en":297,"excerpt":298,"excerpt_en":298,"featured_image_url":299,"cover_position":276,"is_featured":277,"is_published":13,"is_zh_open":13,"is_en_open":13,"published_at":300,"created_at":301,"authors":302,"venue":303,"paper_published_date":301,"citation":304,"paper_type":284,"external_links":305,"attachments":306},"sugar-nephrite-from-the-altun-mountains-xinjiang-china","'Sugar' Nephrite from the Altun Mountains, Xinjiang, China","Nephrite has a long history and profound culturalsignificance in China, along with a vast consumer market. In July 2025, author YG conducted a field trip to nephrite mining areas in the Xinjiang Uygur...","https://project-static.guildgemedu.com/project/35494227-9275-4a4e-bb92-a7077e0b8631.jpg","2026-03-20T16:04:57","2025-03-01T00:00:00","Gao Yujie, Huang Tiantian, Lu Qi.","The Journal of Gemmology","[58] Gao Yujie, Huang Tiantian, Lu Qi. ‘Sugar’ Nephrite from the Altun Mountains, Xinjiang, China. (2025) The Journal of Gemmology, Vol. 39, No. 7, pp. 611-613.",[],[307],{"id":308,"url":309,"name":310},26,"https://project-static.guildgemedu.com/project/0c432edc-093b-4c46-b9fb-6fbe1caabf95.pdf","2025_‘Sugar’ Nephrite from the Altun Mountains, Xinjiang, China_Gao_JoG.pdf",{"id":312,"slug":313,"content_type":271,"title":314,"title_en":314,"excerpt":315,"excerpt_en":315,"featured_image_url":316,"cover_position":276,"is_featured":277,"is_published":13,"is_zh_open":13,"is_en_open":13,"published_at":317,"created_at":301,"authors":318,"venue":303,"paper_published_date":301,"citation":319,"paper_type":284,"external_links":320,"attachments":321},59,"a-pink-sapphire-with-questionable-heat-treatment","A Pink Sapphire with Questionable Heat Treatment","A pink sapphire weighing over 20 ct was recently submitted to Guild Gem Laboratories, and it presented a particularly challenging case for the determination of heat treatment. According to the client,...","https://project-static.guildgemedu.com/project/256445b1-1fc3-4644-833f-970b36d61e1f.jpg","2026-03-20T16:03:47","Gao Yujie, Huang T.T, Andrew Christopher Lucas","Gao Yujie, Huang T.T, Andrew Christopher Lucas. (2025) A Pink Sapphire with Questionable Heat Treatment. The Journal of Gemmology, Vol. 39, No. 8, pp. 736-738.",[],[322],{"id":79,"url":323,"name":324},"https://project-static.guildgemedu.com/project/ba39b48b-9ead-4403-a4ba-e85d0e9d62c4.pdf","2025_A Pink Sapphire with Questionable Heat Treatment_Gao_JoG.pdf",1787544267850]