Gems & Gemology最新文献_第5页

Effects of Mollusk Size on Growth and Color of Cultured Half-Pearls from Phuket, Thailand 软体动物大小对泰国普吉岛养殖半珍珠生长和色泽的影响

IF 2.6 3区地球科学

Gems & Gemology Pub Date : 2019-11-01 DOI: 10.5741/gems.55.3.388

K. Kanjanachatree, Napapit Limsathapornkul, Amorn Inthonjaroen, Raymond J. Ritchie

引用次数: 1

Mineral Inclusions in Ruby and Sapphire from the Bo Welu Gem Deposit in Chanthaburi, Thailand 泰国昌塔武里Bo韦鲁宝石矿床中的红宝石和蓝宝石矿物包裹体

IF 2.6 3区地球科学

Gems & Gemology Pub Date : 2019-11-01 DOI: 10.5741/gems.55.3.354

Supparat Promwongnan, C. Sutthirat

{"title":"Mineral Inclusions in Ruby and Sapphire from the Bo Welu Gem Deposit in Chanthaburi, Thailand","authors":"Supparat Promwongnan, C. Sutthirat","doi":"10.5741/gems.55.3.354","DOIUrl":"https://doi.org/10.5741/gems.55.3.354","url":null,"abstract":"Thailand are located in the provinces of Chanthaburi-Trat, Kanchanaburi, PhraeSukhothai, Ubon Ratchathani, Si Sa Ket, and Phetchabun (figure 1). However, a few main areas have been economically mined and supplied gems to the world market. Sapphire mines were once extensively operated in Kanchanaburi, but most have recently closed down. The Chanthaburi-Trat area has been the most significant source of Thai corundum, and a few small mines are still in operation there. The most famous source of Thai rubies is located in the Bo Rai deposit in the eastern part of Trat Province, close to the Cambodian province of Pailin (figure 1). What became known as “Siamese ruby” was first named from here and adjacent areas. Meanwhile, the main gem mining area for sapphire (yellow, green, and blue, along with golden star and black star sapphires) is the Bang Ka Cha deposit in western Chanthaburi (again, see figure 1). Most gem mines in the central deposits, around Khlung District within Chanthaburi Province, have supplied more sapphire than ruby (Vichit, 1992; Pattamalai, 2015). The focus of this study, the Bo Welu gem field located in the central gem deposits, has been mined for both ruby and sapphire. Corundum from this area is generally heat-treated to enhance its color, especially the red (or purplish red) ruby and the blue sapphire (figure 2), which are in high demand, particularly within Thailand.","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46719367","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

Hydrogen-Rich Green Diamond Color-Treated by Multi-Step Processing 多步骤处理富氢绿色金刚石

IF 2.6 3区地球科学

Gems & Gemology Pub Date : 2019-11-01 DOI: 10.5741/gems.55.3.398

Wenqing Huang, Pei-ran Ni, Ting Shui, Guanghai Shi

引用次数: 1

Pressed Gibbsite and Calcite as a Rhodochrosite Imitation 仿造红锰矿的压制三水铝石和方解石

IF 2.6 3区地球科学

Gems & Gemology Pub Date : 2019-11-01 DOI: 10.5741/gems.55.3.406

H. Xu, Xiaoyan Yu

引用次数: 1

Characteristics of Hydrothermally Treated Beeswax Amber 蜂蜡琥珀的水热处理特性

IF 2.6 3区地球科学

Gems & Gemology Pub Date : 2019-11-01 DOI: 10.5741/gems.55.3.370

Yamei Wang, Yan Li, Fang Liu, Quan-li Chen

{"title":"Characteristics of Hydrothermally Treated Beeswax Amber","authors":"Yamei Wang, Yan Li, Fang Liu, Quan-li Chen","doi":"10.5741/gems.55.3.370","DOIUrl":"https://doi.org/10.5741/gems.55.3.370","url":null,"abstract":"lions of years ago when sap from ancient trees hardened and fossilized. Scientists, gemologists, and collectors treasure amber that contains suspended insects or assorted plant fragments, creating a fascinating time capsule (Ross, 2010). Amber has become increasingly popular in the jewelry trade. It is usually translucent to opaque, and its opacity is caused by the reflection and scattering of incident light by an abundance of internal tiny bubbles. “Beeswax,” a term commonly used in the Chinese gem trade, refers to amber that is semi-translucent to opaque with greasy luster. Beeswax accounts for about 60% of natural amber production globally. Due to the saying “Millennium amber, million years beeswax” in the Chinese gem market, many Chinese consumers mistakenly believe that beeswax takes much longer to form than amber. This misimpression has driven demand for beeswax and significantly raised its price. Among beeswax, the “chicken-fat” yellow variety is highly desired in China for its vivid color, but limited in global production. It is worth noting that in the international rough amber trade, transparent and opaque materials are usually mixed together for sale, just as they are mixed together in nature. There is usually a layer of weathered skin on the surface of both transparent and opaque rough amber, making it impossible to choose them individually by hand under normal lighting. There is no price difference between the two. Quality is judged according to weight, size, shape, and impurities. Due to the popularity of beeswax in the Chinese market, however, amber processing enterprises have preferred to purchase and store rough beeswax materials, artificially driving up the price of the rough ma-","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48426295","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

Natural-Color Fancy White and Fancy Black Diamonds: Where Color and Clarity Converge 自然色花式白和花式黑钻石：色彩和清晰度的融合

IF 2.6 3区地球科学

Gems & Gemology Pub Date : 2019-11-01 DOI: 10.5741/gems.55.3.320

S. eaton-magaña, T. Ardon, C. Breeding, J. Shigley

{"title":"Natural-Color Fancy White and Fancy Black Diamonds: Where Color and Clarity Converge","authors":"S. eaton-magaña, T. Ardon, C. Breeding, J. Shigley","doi":"10.5741/gems.55.3.320","DOIUrl":"https://doi.org/10.5741/gems.55.3.320","url":null,"abstract":"mond, we typically discuss atomic-level defects rather than inclusions—relying more on our spectrometers than our microscopes. Seldom are the diamonds distinguished not by color saturation, but by tone (neutral lightness and darkness) and transparency. Nevertheless, Fancy white and Fancy black diamonds break these rules and exist within their own special category, distinct from the other fancy-color diamonds described previously in our article series (Breeding et al., 2018; Eaton-Magaña et al., 2018a, 2018b). Fancy white diamonds, due to their scarcity as faceted stones, comparatively small size, and the lack of notable historical examples, are not well known. They are largely procured by connoisseurs. Probably the most famous of Fancy black diamonds is the Black Orlov (figure 1), a 67.50 ct cushion with a provenance dating back two centuries and, like the Hope diamond, rumored to be “cursed” (Balfour, 2009). Other famous Fancy black diamonds include the 312.24 ct Mogul-cut Spirit of de Grisogono, one of the world’s largest black diamonds, which originated from the Central African Republic. The Gruosi diamond is a 115.34 ct heart shape reportedly discovered in India, and the Korloff Noir is an 88 ct round brilliant. NATURAL-COLOR FANCY WHITE AND FANCY BLACK DIAMONDS: WHERE COLOR AND CLARITY CONVERGE","PeriodicalId":12600,"journal":{"name":"Gems & Gemology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45954403","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

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

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

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

引用次数: 0