1998
DOI: 10.1002/(sici)1520-6378(199810)23:5<323::aid-col8>3.0.co;2-y
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The alexandrite effect of theTavernier diamond caused by fluorescence under daylight

Abstract: The 56.07‐carat Tavernier pear‐shaped gem diamond not only has an important historical provenance, but also shows a substantial color change between incandescent light and daylight. This famous diamond exhibits a very strong blue fluorescence when exposed to long‐wavelength ultraviolet (UV) radiation. It appears light brown (an orange hue) under incandescent light, and light pink (a purple hue) under daylight. This change in color, or “alexandrite effect,” is caused by its very strong blue fluorescence resulti… Show more

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Cited by 8 publications
(7 citation statements)
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“…The true alexandrite effect was classified as “type 1” and is characterized by an absolute hue angle change (|Δ h °|) above 20° between daylight and incandescent light and a much smaller change (<20°) between daylight and fluorescent light. For the mineral alexandrite, the absolute hue angle difference can be up to almost 180°, which represents complementary colors . The results of this investigation show that zultanite has an absolute hue angle change above 20° without displaying fluorescence, while that of the common diaspore is smaller than 20°.…”
Section: Discussionmentioning
confidence: 70%
“…The true alexandrite effect was classified as “type 1” and is characterized by an absolute hue angle change (|Δ h °|) above 20° between daylight and incandescent light and a much smaller change (<20°) between daylight and fluorescent light. For the mineral alexandrite, the absolute hue angle difference can be up to almost 180°, which represents complementary colors . The results of this investigation show that zultanite has an absolute hue angle change above 20° without displaying fluorescence, while that of the common diaspore is smaller than 20°.…”
Section: Discussionmentioning
confidence: 70%
“…Liu et al . studied the alexandrite effect of the Tavernier diamonds caused by fluorescence under daylight.…”
Section: Introductionmentioning
confidence: 99%
“…Many spectrometers and colorimeters with single integrating sphere have been developed for color measurement and color grading of gemstones, such as Okuda Colorimeter, Kalnew spectrophotometer, Rennilson–Hale colorimeter, Gubelin spectrometer, LambdaSpec imaging spectrometer, Sarin spectrometer, and Gemological Institute of America (GIA) spectrograph system …”
Section: Introductionmentioning
confidence: 99%
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