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Alexandrite

Tsarstone collectors guide

blue green

31. What gemstones change color like alexandrite? at Alexandrite discussion forums | Alexandrite guide
What gemstones change color like alexandrite? at Alexandrite discussion forums | Alexandrite guide
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32. What are the most common colors of alexandrite?
Unfortunately, most alexandrites show either a nice color in daylight or an attractive color under incandescent light. Rarely are both colors bright and vivid and often stones that change to bright red under incandescent light are only brown or almost bla
HTML, 26 Kb, 2008-07-29 08:10:53
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33. What is the difference between chrysoberyl and alexandrite?
Chrysoberyl is the species name and Alexandrite is the variety name. Alexandrite is that variety of chrysoberyl that changes color as a function of the light source; green in daylight and red under incandescent light.
HTML, 25 Kb, 2008-07-29 08:10:13
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34. Why does alexandrite appear to change color in sunlight and artificial light?
Alexandrite is a trichroic gemstone which absorbs and reflects light differently in each of its three optical directions. Spectroscopic analysis reveals a different absorption spectrum for each of the three optical directions. The differences in absorptio
HTML, 26 Kb, 2008-07-29 08:10:46
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35. Young-Helmholtz theory of color vision
The theory that the eye contains three different groups of retinal fibers (cones) with maximum response to three primary colors to red-yellow, green, and blue violet, which are parts of the spectrum.
HTML, 24 Kb, 2008-07-20 13:08:04
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