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}
Emilie Elmaleh, S. Schmidt, S. Karampelas, K. Link, L. Kiefert, Annette Suessenberger, A. Paul
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.
{"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}
{"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}
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}
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}
{"title":"A New Method for Determining Gem Tourmaline Species by LA-ICP-MS","authors":"Ziyin Sun, Aaron C. Palke, C. Breeding, B. Dutrow","doi":"10.5741/GEMS.55.1.2","DOIUrl":"https://doi.org/10.5741/GEMS.55.1.2","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":"48304123","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}
W. Vertriest, D. Girma, P. Wongrawang, Ungkhana Atikarnsakul, Kevin Schumacher
{"title":"Land of Origins: A Gemological Expedition to Ethiopia","authors":"W. Vertriest, D. Girma, P. Wongrawang, Ungkhana Atikarnsakul, Kevin Schumacher","doi":"10.5741/GEMS.55.1.72","DOIUrl":"https://doi.org/10.5741/GEMS.55.1.72","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":"48396252","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}
S. eaton-magaña, T. Ardon, Karen V. Smith, C. Breeding, J. Shigley
Diamond is one of Earth’s most extraordinary materials. It represents the pinnacle for several material and physical properties. As a gem, however, it is the near-perfect examples—diamonds attaining the D-Flawless distinction—and those with imperfections resulting in a vibrant or surprising color that create the most enduring impressions. Fancy-color natural diamonds are among the most highly valued gemstones due to their attractiveness and great rarity. The 18.96 ct Winston Pink Legacy, with a color grade of Fancy Vivid pink, recently made history by selling at over $50 million, its $2.6 million per carat price an all-time high for a pink diamond (Christie’s, 2018). This article is the third in a series of studies on natural colored diamonds: Breeding et al. (2018) discussed the color origin of green diamonds, and EatonMagaña et al. (2018) dealt with blue/gray/violet diamonds. Here we summarize the color origin of orangy pink, purplish pink to pinkish purple, brownish pink to pinkish brown, pink, red, purple, and unmodified brown diamonds. Although this article cov-
钻石是地球上最非凡的物质之一。它代表了几种材料和物理特性的顶峰。然而，作为一颗宝石，它是近乎完美的例子-钻石达到d -无瑕的区别-以及那些不完美导致充满活力或令人惊讶的颜色，创造最持久的印象。彩色天然钻石因其吸引力和稀有性而成为最有价值的宝石之一。这颗18.96克拉的Winston Pink Legacy钻石，颜色等级为Fancy Vivid Pink，最近以超过5000万美元的价格创造了历史，每克拉260万美元的价格创下了粉红钻石的历史新高(佳士得，2018年)。本文是关于天然彩色钻石的系列研究中的第三篇:Breeding et al.(2018)讨论了绿色钻石的颜色来源，EatonMagaña et al.(2018)研究了蓝色/灰色/紫色钻石。在这里，我们总结了橙粉色、紫粉色到粉紫色、棕粉色到粉棕色、粉色、红色、紫色和未经修饰的棕色钻石的颜色来源。虽然这篇文章包含
{"title":"Natural-Color Pink, Purple, Red, and Brown Diamonds: Band of Many Colors","authors":"S. eaton-magaña, T. Ardon, Karen V. Smith, C. Breeding, J. Shigley","doi":"10.5741/GEMS.54.2.352","DOIUrl":"https://doi.org/10.5741/GEMS.54.2.352","url":null,"abstract":"Diamond is one of Earth’s most extraordinary materials. It represents the pinnacle for several material and physical properties. As a gem, however, it is the near-perfect examples—diamonds attaining the D-Flawless distinction—and those with imperfections resulting in a vibrant or surprising color that create the most enduring impressions. Fancy-color natural diamonds are among the most highly valued gemstones due to their attractiveness and great rarity. The 18.96 ct Winston Pink Legacy, with a color grade of Fancy Vivid pink, recently made history by selling at over $50 million, its $2.6 million per carat price an all-time high for a pink diamond (Christie’s, 2018). This article is the third in a series of studies on natural colored diamonds: Breeding et al. (2018) discussed the color origin of green diamonds, and EatonMagaña et al. (2018) dealt with blue/gray/violet diamonds. Here we summarize the color origin of orangy pink, purplish pink to pinkish purple, brownish pink to pinkish brown, pink, red, purple, and unmodified brown diamonds. Although this article cov-","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47306321","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}
GEMS & GEMOLOGY WINTER 2019 Over the last decade, GIA has invested considerable resources in determining the geographic origin of certain gemstones. The field gemology program plays an essential role in these studies. Its mission is to build, maintain, and expand a reliable reference collection of scientific samples (figure 1). These stones are used for research by GIA’s gemologists and research scientists. This article explains the challenges of geographic origin research, sample collection, and the current state of GIA’s colored stone reference collection. The development of gemstone deposits is also discussed, and an overview is provided of the most important localities for which GIA offers origin determination.
{"title":"Field Gemology: Building a Research Collection and Understanding the Development of Gem Deposits","authors":"W. Vertriest, Aaron C. Palke, Nathan D. Renfro","doi":"10.5741/gems.55.4.490","DOIUrl":"https://doi.org/10.5741/gems.55.4.490","url":null,"abstract":"GEMS & GEMOLOGY WINTER 2019 Over the last decade, GIA has invested considerable resources in determining the geographic origin of certain gemstones. The field gemology program plays an essential role in these studies. Its mission is to build, maintain, and expand a reliable reference collection of scientific samples (figure 1). These stones are used for research by GIA’s gemologists and research scientists. This article explains the challenges of geographic origin research, sample collection, and the current state of GIA’s colored stone reference collection. The development of gemstone deposits is also discussed, and an overview is provided of the most important localities for which GIA offers origin determination.","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45966035","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}
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