Results 21 to 30 of about 265 (147)
Crystals, 2023 In this study about spessartines,13 spessartine samples with proper conditions are used for FTIR spectrum and UV-Vis spectrum tests to find the gemological characteristics and coloration mechanism.
Meilin Zhu, Ying Guo
doaj +1 more source
Crystals, 2023 Agate attracts the attention of gem mineralogists because of its variable colors. The color of agate is closely related to its naming and classification, so it is necessary to study the color and mineral origin of agate.
Sixue Zhang +6 more
doaj +1 more source
Variation in Gemological Characteristics in Tsavorites with Different Tones from East Africa
Crystals, 2022 In this paper, the influencing factors of the color and the gemological changes of tsavorites with different tones from East Africa were studied. The gemological characteristics of 35 different green tones in tsavorites were collected based on the ...
Yuanmeng Ma, Ying Guo
doaj +1 more source
Gemological features of diaspore in sodra—Milas (mugla) region
Frontiers in Earth Science, 2023 Diaspore, is related to bauxite in terms of its formation mechanism. Diaspore is one of the gemstone quality stones used in jewelry and jewelry making. It is possible to come across gemstones in various regions of the world.
Eyyüp Hikmet Kinaci, Alican Ozturk
doaj +1 more source
Crystals, 2023 In recent years, “Jin Gao Yu” that has been traded as a kind of jade has appeared in areas of the Luonan and Shangnan counties, Shangluo City, Shaanxi Province, attracting the attention of scholars and consumers for its delicate texture and warm color ...
Liangyu Liu +6 more
doaj +1 more source
Low-Crystallinity Index Chalcedony from Longhua, China: Characteristics and Formation [PDF]
Lithosphere, 2023 A low-crystallinity index chalcedony was found in the rhyolitic ignimbrite of the Late Jurassic Zhangjiakou Formation, located in Longhua County, Hebei Province, China.
Qiuli Yan, Guanghai Shi
doaj +1 more source
Spectroscopic Characteristics and Coloring Mechanisms of Different Colored Spinels from Myanmar
Crystals, 2023 Spinel is a common gemstone that has attracted the attention of gemologists worldwide because of its high refractive index, rich colors and brilliant hues. Myanmar is an important source of spinel. The present paper provides a systematic characterization
Lei Zhang, Kui He, Qingfeng Guo
doaj +1 more source
Crystals, 2022 Currently, most of the popular spinels in the jewellery market come from Myanmar and Tajikistan. It is well known that provenance is one of the main factors affecting the value of a gemstone, and the geographic origin of a gemstone can be determined by ...
Yi Zhang, Jing-Ran Zhu, Xiao-Yan Yu
doaj +1 more source
Crystals, 2022 With the development of synthetic gem technology, a large number of synthetic rock crystals, such as natural and synthetic amethyst and natural and synthetic smoky quartz, have emerged in the market.
Kaichao Liu, Ying Guo
doaj +1 more source
Photochromism, UV-Vis, Vibrational and Fluorescence Spectroscopy of Differently Colored Hackmanite
Crystals, 2023 Because of the rich fluorescent color and unique photochromic properties, hackmanite has attracted many mineralogists. In this paper, the basic gemmological characteristics and photochromic and fluorescence mechanisms of four different colors of ...
Chuchu Song +4 more
doaj +1 more source