Feasibility study on quality evaluation of Jadeite-jade color green based on GemDialogue color chip

Guo, Ying; Zong, Xiang; Qi, Ming

doi:10.1007/s11042-018-5753-7

Cited by 23 publications

(19 citation statements)

References 18 publications

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“…Two sets of 2880 data from 120 jadeite samples were obtained, including tristimulus values (X, Y and Z) and 24 variables. Each sample was measured 3 times to ensure the accuracy (Guo, Zong & Qi, 2018b) .…”

Section: Color Variation Of Red Jadeite Under Three Light Sourcesmentioning

confidence: 99%

Impact of different standard lighting sources on red jadeite and color quality grading

et al. 2019

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The purpose of this paper is to investigate the standard light source for grading and displaying the color of red jadeite and to classify the color. With Raman spectrometer, ultraviolet-visible spectrophotometer and X-ray fluorescence spectrometer, the results show that, the Fe 3+ is the main chromogenic mineral of red jadeite, which negatively correlates with the tonal angle, while the color of red jadeite has a positive correlation with the hematite content. The color of 120 red jadeite samples was examined by collecting the reflective signaled from the sample surface using an integrating sphere with the portable X-Rite SP62 spectrophotometer based on CIE 1976 L*a*b* uniform color space. The color parameters of jadeite samples under D65, A and CWF standard light sources were analyzed. The light spectrum of D65 light source is continuous, relatively smoothed with high color temperature, which makes the sample color close to that under the natural light and can be used as the best evaluation light source. A light source contributes to improve the red tone of jadeite, which is the best light source for commercial display of red jadeite. CWF light source can be used as the auxiliary lighting for color evaluation. The color of red jadeite is divided into five levels from best to worst using K-Means cluster analysis and Fisher discriminant analysis under D65 light source: Fancy Vivid, Fancy Deep, Fancy Intense, Fancy dark and Fancy. ABSTRACTImpact of different standard lighting sources on red jadeite and color quality grading Impacto por diferentes fuentes de iluminación estándar en la clasificación de jadeíta roja y la calidad del color

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Section: Color Variation Of Red Jadeite Under Three Light Sourcesmentioning

confidence: 99%

Impact of different standard lighting sources on red jadeite and color quality grading

et al. 2019

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“…The color of peridot was first quantified by Stockton and Manson based on the CIE1931 color space system in 1983, but the geometrical distance between two colors is inconsistent with the human visual perception in the system. In order to solve this problem, the CIE1976 L*a*b* uniform color space system was established and applied to gem color research, such as peridot, alexandrite, sapphire, tourmaline, color‐change garnet, rose quartz, Cubic Zirconia (CZ), blue amber, citrine, and jadeite‐jade …”

Section: Introducitonmentioning

confidence: 99%

“…In order to solve this problem, the CIE1976 L*a*b* uniform color space system was established and applied to gem color research, such as peridot, 7 alexandrite, 8,9 sapphire, 10 tourmaline, 11,12 colorchange garnet, [13][14][15][16] rose quartz, 17 Cubic Zirconia (CZ), 18 blue amber, 19 citrine, 20 and jadeite-jade. [21][22][23][24][25] However, the shape of the a*-b* diagram is distorted in the CIE1976 L*a*b* color space system. Hue angles are not evenly arranged in the a*-b* diagram, so we cannot judge which hue angle is yellow or green from the diagram.…”

Section: Introducitonmentioning

confidence: 99%

Color effect of light sources on peridot based on CIE1976 Lab* color system and round RGB diagram system

Tang

Guo

2019

Color Research & Application

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Previous research indicated that the peridot's color is dominated by the selective absorption of visible light caused by ferrous ion, the hue angle of which is in an inverse ratio of the concentration of Fe2+. This article focuses on the color effect of peridot under different standard light sources based on the CIE1976 L*a*b* color space system and round RGB diagram system and tries to find the best one for its grading and display. Based on the results of a series of experiments, including electron microprobe analysis, spectrophotometer, UV‐Vis spectrum, standard illumination box, and Munsell neutral color chips, it was suggested that the spectral power distribution and color temperature of a standard light source significantly influence the color of peridot in terms of lightness and chroma, particularly in the hue of peridot. As for color grading and displaying of peridot, standard light source A fails to fit in, and the color of peridot under a fluorescent light source has a higher chroma but a lower hue angle than that under daylight light source. The best choice for grading and displaying peridot is the standard light source D65. It is better to distinguish the hue of peridot when it is calculated by the round RGB diagram system.

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“…The formation of rocks has always been one of the focuses of geologists, besides the colorimetric study on gemology of jadeite and other gemstones [1][2][3][4][5][6][7][8], the equilibrium thermodynamic intelligent simulated calculation [9] is the main content of the theoretical study of rock formation. Most of the rocks in nature are formed in the period of a long-term geological history, but the experimental conditions on the formation of rocks cannot meet the time effect.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic research of jadeite jade at high temperatures and high pressures based on phase balance intelligent calculation

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Original scientific paper https://doi.org/10.2298/TSCI181202155YBased on the thermodynamic calculation of chemical composition and the intelligent calculation of phase equilibria, the temperature-pressure of the diagenetic environment of Burma jadeite-jade was studied, and its metamorphism was verified. Firstly, the W kj value and activity of the four end-member of jadeite (Jd), augite (Acm), diopsite (Di), and hedenbergite (Hed) were calculated. Jadeite rock system was simplified as NCFMASH, and the equilibrium temperature-pressure conditions of both the combination of quartz and jadeite, sodium-feldspar with little kyanite, and the combination of jadeite diopside, hedenbergite, kyanite, sodium-tremolite, tremolite and oblique zoisite were revealed as 751 °C with 17.0 kb, and 631 °C with 18.8 kb. Based on the two kinds of mineral combination with a small amount of sodium mica [Pa], the balance of the system temperature should be in the range from 700-770 °C, and balanced pressure-range should be in the range from 17. 34-18.83 kb, which reflects the pure NCFMASH system hard rock type jadeite-jade rock formation of the real balance temperature-pressure range. It is concluded that the metamorphism of jadeite rock has a stable growth equilibrium temperature-pressure range, which is the reaction interval of the closed system NCTNASH. It is explained that the reason that synthetic jadeite-jade reaches the gem level is that it has not been simulated as a mineral assemblage in the later stage and it will be subjected to multi-phase dynamic metamorphism after the rock forms, so it is unreasonable that jadeite synthesize is not just from one mineral crystals.

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Feasibility study on quality evaluation of Jadeite-jade color green based on GemDialogue color chip

Cited by 23 publications

References 18 publications

Impact of different standard lighting sources on red jadeite and color quality grading

Impact of different standard lighting sources on red jadeite and color quality grading

Color effect of light sources on peridot based on CIE1976 Lab* color system and round RGB diagram system

Thermodynamic research of jadeite jade at high temperatures and high pressures based on phase balance intelligent calculation

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Feasibility study on quality evaluation of Jadeite-jade color green based on GemDialogue color chip

Cited by 23 publications

References 18 publications

Impact of different standard lighting sources on red jadeite and color quality grading

Impact of different standard lighting sources on red jadeite and color quality grading

Color effect of light sources on peridot based on CIE1976 L*a*b* color system and round RGB diagram system

Thermodynamic research of jadeite jade at high temperatures and high pressures based on phase balance intelligent calculation

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Color effect of light sources on peridot based on CIE1976 Lab* color system and round RGB diagram system