Results 11 to 20 of about 949 (188)
Crystals, 2023 The geographic origin determination of ruby is increasingly important in the gem trade and geological research. Unlike metamorphic-related ruby, the rarer basalt-related ruby has gained significant attention, especially from Thailand, a major producer of
Enqi Li, Bo Xu
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Gemological and Luminescence Characteristics of Taaffeites from Mogok, Myanmar
Minerals, 2023 Taaffeite is a rare gem that has been found in different localities such as Tanzania, Sri Lanka, China, and Mogok, Myanmar. In this study, thirty-two taaffeite samples from Mogok, Myanmar, were investigated by conventional gemological testing, laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), Raman spectrometry, and fluorescence ...
Bihan Lin +4 more
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Crystals, 2023 Fluorite has been attracting the attention of gemstone mineralogists because of its rich color and excellent fluorescence properties. This paper studied fluorite with three color types (blue, green, and white) and five blue-purple fluorites with an ...
Yang Liu +5 more
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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
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Inclusions and Gemological Characteristics of Emeralds from Kamakanga, Zambia
Minerals, 2023 Currently, Zambia is one of the world’s major emerald-producing countries. In this study, emerald samples from Kamakanga, Zambia, were systematically analyzed by standard gemological tests, microscopic observation, Raman spectroscopy test of mineral inclusions, and fluid inclusions.
Zhang, Yi, Yu, Xiao-Yan
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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
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Gemological and Mineralogical Studies of Greenish Blue Apatite in Madagascar
Crystals, 2022 Madagascar is known as the ‘Island of Gemstones’ because it is full of gemstone resources. Apatite from Madagascar is widely popular because of its greenish blue Paraiba-like color. This study analyzes apatite from Madagascar through standard gemological
Zhi-Yi Zhang +3 more
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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
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Gemological characteristics of jewelry-ornamental septaria of the Ulyanovsk region
Известия высших учебных заведений: Геология и разведка, 2019 Septaria of the Ulyanovsk region are high-quality jewelry and ornamental material. Septaria are associated with lower Cretaceous sediments and are located in the coastal cliffs and the beach area of the Volga river.
D. A. Petrochenkov
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Relationship between the Coloration Mechanism and Gemological Properties of Purple Scapolite
Crystals, 2023 Purple scapolite is a precious gemstone. In this paper, we compared the crystal structure and spectral characteristics of purple scapolite before and after heat treatment with conventional gemological tests, EPMA, XRF, LA-ICP-MS, infrared spectroscopy ...
Yinghua Rao +3 more
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