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Evidence of Rotation in Flame-Structure Pearls from Bivalves of the Tridacnidae Family Tridacnidae科双瓣动物火焰结构珍珠旋转的证据
IF 2.6 3区 地球科学
Gems & Gemology Pub Date : 2019-08-01 DOI: 10.5741/gems.55.2.216
J. Gauthier, Jacques Fereire, Thanh Nhan Bui
{"title":"Evidence of Rotation in Flame-Structure Pearls from Bivalves of the Tridacnidae Family","authors":"J. Gauthier, Jacques Fereire, Thanh Nhan Bui","doi":"10.5741/gems.55.2.216","DOIUrl":"https://doi.org/10.5741/gems.55.2.216","url":null,"abstract":"","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42578771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A Decade of Ruby from Mozambique: A Review 莫桑比克红宝石十年回顾
IF 2.6 3区 地球科学
Gems & Gemology Pub Date : 2019-08-01 DOI: 10.5741/gems.55.2.162
W. Vertriest, Sudarat Saeseaw
{"title":"A Decade of Ruby from Mozambique: A Review","authors":"W. Vertriest, Sudarat Saeseaw","doi":"10.5741/gems.55.2.162","DOIUrl":"https://doi.org/10.5741/gems.55.2.162","url":null,"abstract":"the city of Maputo as its capital. It shares borders with Tanzania to the north, Malawi and Zambia to the northwest, Zimbabwe to the west, and Swaziland and South Africa to the south. In the east, Mozambique is separated from Madagascar by the Mozambique Channel, which is part of the Indian Ocean. Many of these countries are known producers of gem corundum. Mozambique joined this club of ruby sources only in the last decade, a mere fraction of its long history. Around 2,000 years ago, Bantu tribes settled in what is now Mozambique. In the eleventh century, traders from the northern shores arrived and set up trading posts. These were mainly Arab, Persian, and Somali merchants who merged their own customs with those of the local Bantu, leading to the development of the Swahili culture along the eastern coast of Africa. In 1498, Vasco da Gama was the first European to arrive in Mozambique, en route to India. He encountered the Arab merchant ruler Mussa Bin Bique, whose name was given to the area. Vasco da Gama’s arrival started the Portuguese influence in the East African country, which lasted until Mozambique gained independence in 1975. This independence sparked a civil war that tore the country apart until the mid-1990s, when its first elections with multiple parties were held. Since these elections, the country has been relatively stable, although insurgent groups are still active. The country’s population of more than 29 million is largely Christian, with a significant number who follow Islam or traditional animistic beliefs. Portuguese remains the official language, though many","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43668544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Madagascar Sapphire: Low-Temperature Heat Treatment Experiements 马达加斯加蓝宝石：低温热处理试验
IF 2.6 3区 地球科学
Gems & Gemology Pub Date : 2019-08-01 DOI: 10.5741/gems.55.2.184
E. Hughes, R. Perkins
{"title":"Madagascar Sapphire: Low-Temperature Heat Treatment Experiements","authors":"E. Hughes, R. Perkins","doi":"10.5741/gems.55.2.184","DOIUrl":"https://doi.org/10.5741/gems.55.2.184","url":null,"abstract":"from noted Australian gemologist Terry Coldham. In Bangkok he ran into a friend with a parcel of Madagascar sapphire. Mr. Coldham’s friend said he was going “to the burner,” hoping to “sweeten” the color with a low-temperature treatment that would lighten the hue. He indicated that the temperatures they were using were likely below 1000°C. This coincided with the sapphire rush at Bemainty (Perkins, 2016) that produced high-quality blue sapphires (figure 1), ranging from lighter colors with a lower iron content to much deeper blues with a higher iron content (Pardieu et al., 2017). The abundance of blue sapphires from Madagascar being tested at Lotus Gemology in Bangkok, along with rumors of lower-temperature heat treatment (see “Defining ‘Low’ Temperature” below), suggested the need for further study and heat treatment experiments on this material. Our aim was to record the characteristics of Madagascar sapphires and to detect this type of heat treatment.","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46437889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Inclusions in Natural, Treated, Synthetic, and Imitation Opal 天然、处理、合成及仿蛋白石中的内含物
IF 2.6 3区 地球科学
Gems & Gemology Pub Date : 2019-08-01 DOI: 10.5741/gems.55.2.244
Nathan D. Renfro, John I. Koivula, J. Muyal, S. McClure, Kevin Schumacher, J. Shigley
{"title":"Inclusions in Natural, Treated, Synthetic, and Imitation Opal","authors":"Nathan D. Renfro, John I. Koivula, J. Muyal, S. McClure, Kevin Schumacher, J. Shigley","doi":"10.5741/gems.55.2.244","DOIUrl":"https://doi.org/10.5741/gems.55.2.244","url":null,"abstract":"","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45786032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Black Nephrite Jade from Guangxi, Southern China 广西黑玉
IF 2.6 3区 地球科学
Gems & Gemology Pub Date : 2019-08-01 DOI: 10.5741/gems.55.2.198
Qian Zhong, Zong-ting Liao, Li-jian Qi, Zhengyu Zhou
{"title":"Black Nephrite Jade from Guangxi, Southern China","authors":"Qian Zhong, Zong-ting Liao, Li-jian Qi, Zhengyu Zhou","doi":"10.5741/gems.55.2.198","DOIUrl":"https://doi.org/10.5741/gems.55.2.198","url":null,"abstract":"","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46723318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
A Pearl Identification Challenge 珍珠鉴定挑战
IF 2.6 3区 地球科学
Gems & Gemology Pub Date : 2019-08-01 DOI: 10.5741/gems.55.2.229
Nicholas Sturman, L. Otter, Artitaya Homkrajae, Nanthaporn Nilpetploy, Kwanreun Lawanwong, Promlikit Kessrapong, K. Jochum, B. Stoll, H. Gotz, Dorrit E. Jacob
{"title":"A Pearl Identification Challenge","authors":"Nicholas Sturman, L. Otter, Artitaya Homkrajae, Nanthaporn Nilpetploy, Kwanreun Lawanwong, Promlikit Kessrapong, K. Jochum, B. Stoll, H. Gotz, Dorrit E. Jacob","doi":"10.5741/gems.55.2.229","DOIUrl":"https://doi.org/10.5741/gems.55.2.229","url":null,"abstract":"","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44463847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
U-Pb Ages of Zircon Inclusions in Sapphires from Ratnapura and Balangoda (Sri Lanka) and Implications for Geographic Origin Ratnapura和Balangoda（斯里兰卡）蓝宝石中锆石包裹体的U-Pb年龄及其地理成因意义
IF 2.6 3区 地球科学
Gems & Gemology Pub Date : 2019-05-01 DOI: 10.5741/GEMS.55.1.18
Emilie Elmaleh, S. Schmidt, S. Karampelas, K. Link, L. Kiefert, Annette Suessenberger, A. Paul
{"title":"U-Pb Ages of Zircon Inclusions in Sapphires from Ratnapura and Balangoda (Sri Lanka) and Implications for Geographic Origin","authors":"Emilie Elmaleh, S. Schmidt, S. Karampelas, K. Link, L. Kiefert, Annette Suessenberger, A. Paul","doi":"10.5741/GEMS.55.1.18","DOIUrl":"https://doi.org/10.5741/GEMS.55.1.18","url":null,"abstract":"Five sapphires from the secondary placer deposits of Ratnapura and Balangoda in Sri Lanka were classified as being of metamorphic/metasomatic/non-basalt-related origin based on trace-element analysis (LA-ICP-MS) and inclusion characterization. Two sapphires—one from each deposit—contained suitable zircon inclusions that were dated using the LA-ICP-MS method. They yielded U-Pb ages of approximately 549 Ma. The results suggest that the zircon enclosed in the sapphires probably formed in a high-temperature event at the end of the Precambrian granulite facies metamorphism of the ancient Gondwana continent and that this event coincides with the crystallization of the sapphires. The metamorphic character of these sapphires is confirmed from the traceelement composition as well as the solid- and liquid-phase inclusions.","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46139541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Pleochroism and Color Change in Faceted Alexandrite: Influence of Cut and Sample Orientation 镶嵌亚历山大岩的多色性和颜色变化：切口和样品取向的影响
IF 2.6 3区 地球科学
Gems & Gemology Pub Date : 2019-05-01 DOI: 10.5741/GEMS.55.1.61
K. Schmetzer
{"title":"Pleochroism and Color Change in Faceted Alexandrite: Influence of Cut and Sample Orientation","authors":"K. Schmetzer","doi":"10.5741/GEMS.55.1.61","DOIUrl":"https://doi.org/10.5741/GEMS.55.1.61","url":null,"abstract":"","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49100608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
The Talisman of Charlemagne: New Historical and Gemological Discoveries 查理曼大帝的护身符:新的历史和宝石学发现
IF 2.6 3区 地球科学
Gems & Gemology Pub Date : 2019-05-01 DOI: 10.5741/GEMS.55.1.30
G. Panczer, Geoffray Riondet, Lauriane Forest, M. Krzemnicki, D. Carole, Florian Faure
{"title":"The Talisman of Charlemagne: New Historical and Gemological Discoveries","authors":"G. Panczer, Geoffray Riondet, Lauriane Forest, M. Krzemnicki, D. Carole, Florian Faure","doi":"10.5741/GEMS.55.1.30","DOIUrl":"https://doi.org/10.5741/GEMS.55.1.30","url":null,"abstract":"","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44247778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Provenance Discrimination of Freshwater Pearls by LA-ICP-MS and Linear Discriminant Analysis (LDA) LA-ICP-MS和线性判别分析(LDA)鉴别淡水珍珠的来源
IF 2.6 3区 地球科学
Gems & Gemology Pub Date : 2019-05-01 DOI: 10.5741/GEMS.55.1.47
Artitaya Homkrajae, Ziyin Sun, T. Blodgett, Chunhui Zhou
{"title":"Provenance Discrimination of Freshwater Pearls by LA-ICP-MS and Linear Discriminant Analysis (LDA)","authors":"Artitaya Homkrajae, Ziyin Sun, T. Blodgett, Chunhui Zhou","doi":"10.5741/GEMS.55.1.47","DOIUrl":"https://doi.org/10.5741/GEMS.55.1.47","url":null,"abstract":"","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45270569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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