Results 11 to 20 of about 10,184 (280)

Discrimination of HPHT-treated Type Ⅰa Cape Diamonds Using Optical and Photoluminescence Spectroscopic Techniques

Yankuang ceshi, 2020
BACKGROUND Spectroscopic characteristics for brown colored Type Ⅱa diamonds treated by high pressure high temperature (HPHT) processes have been investigated extensively.
SONG Zhong-hua, LU Tai-jin, TANG Shi, GAO Bo, SU Jun, KE Jie   +5 more
doaj   +1 more source

Analysis of Crystallinity and Physical Properties of the Bio-solar Gemstone

Aceh International Journal of Science and Technology, 2020
– Bio-solar is one of the natural gemstones found in the province of Aceh in Indonesia. A recent study suggested that this gemstone could be considered as a vesuvianite type of gemstone.
Ismail Ismail, Akmal NIzar, Murzal ., Zulkarnain Jalil   +3 more
doaj   +1 more source

Identification of Jadeite Filled with Inorganic Materials Using UV Fluorescence, Infrared Spectroscopy and LIBS Techniques

Yankuang ceshi, 2022
BACKGROUND Through visiting the jadeite market, the existence of inorganic material-filled jadeite is known, but there is a lack of identification basis due to rare references.
YANG Chunmei, HUANG Ziyun, QIN Jingwen, LU Zhenping, LU Taijin, TANG Ziwei   +5 more
doaj   +1 more source

Problems Faced by Online Gemstone Traders of NamakMandi market at Pakistani Airports

Journal of Business and Social Review in Emerging Economies, 2023
Purpose: This paper analyses the views and experiences of gemstone traders at the NamakMandi (NM) gemstone market. Methodology: The paper draws on the data from a stakeholder’s workshop held at Bacha Khan University Charsadda (Pakistan) and ten (10 ...
Syed Owais, Arshad khan Bangash, Javaria Raza   +2 more
doaj   +1 more source

The Spectral Characteristics and Identification Techniques for Colorless and Near-colorless HPHT Synthetic Diamonds

Yankuang ceshi, 2016
Melee-sized colorless HPHT synthetic diamonds mixed with natural diamonds in jewellery have been reported by gem testing laboratory. It was noted that the differences of the fluorescence and phosphorescence between natural and synthetic diamonds are the ...
SONG Zhong-hua, LU Tai-jin, SU Jun, GAO Bo, TANG Shi, HU Ning, KE Jie, ZHANG Jun   +7 more
doaj   +1 more source

Research on Laboratory Testing Features of Chemical Vapor Deposition in Overgrowth Diamonds

Yankuang ceshi, 2019
BACKGROUND Overgrowth diamond refers to the product of thick CVD synthetic diamond layer grown on a natural diamond with the whole appearance. Since overgrown diamonds contain information on the nitrogen impurities of natural diamonds, traditional ...
TANG Shi, SU Jun, LU Tai-jin, MA Yong-wang, KE Jie, SONG Zhong-hua, ZHANG Jun, ZHANG Xiao-yu, DAI Hui-ru, LI Hai-bo, ZHANG Jian, WU Xu-xu, LIU Hou-xiang   +12 more
doaj   +1 more source

Gemstone Inclusion Study by 3D Raman-Mapping and High-Resolution X-ray Computed Tomography: The Case of Trapiche Emerald from Swat, Pakistan

Crystals, 2022
Gemstones usually contain inclusions as the natural hallmark of their formation. Studies on inclusions may contribute to our understanding of the gem and better adapt to the gems and jewelry industry.
Yujie Gao, Mingyue He, Xu Li, Moqing Lin, Xueying Sun, Yanfang Zhang   +5 more
doaj   +1 more source

Identification of HPHT-treated Hydrogen-rich Diamonds by Optical Absorption and Photo Luminescence Spectroscopy Techniques

Yankuang ceshi, 2018
Research on different types of brown diamonds under high temperature and high pressure and their structural characteristics is one of the most difficult and important issues in diamond research. Previous studies on hydrogen-rich diamond mainly focused on
SONG Zhong-hua, LU Tai-jin, SU Jun, KE Jie, TANG Shi, LI Jian, GAO-bo, ZHANG Jun   +7 more
doaj   +1 more source

Assessment of environmental impact of gemstone mining in Ijero-Ekiti, Nigeria [PDF]

, 2018
Purpose. To examine the environmental impacts of gemstone mining activities on the people of Ijero-Ekiti, Ekiti State, Nigeria. Methods. Soil and water test were carried out on samples from the mine and its environment.
Afeni, T, Ibitolu, F
core   +1 more source

An Object-Oriented Language-Database Integration Model: The Composition-Filters Approach [PDF]

, 1991
This paper introduces a new model, based on so-called object-composition filters, that uniformly integrates database-like features into an object-oriented language. The focus is on providing persistent dynamic data structures, data sharing, transactions,
Aksit, Mehmet, Bergmans, Lodewijk, Vural, S., Vural, Sinan   +3 more
core   +5 more sources