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21. The Alexandrite Effect: Discussion about the alexandrite effect as a non-color-constancy phenomenon from the color theory perspective; HTML, 42 Kb, 2008-07-20 13:01:34; /chapters/chapter5/index.html
22. Alexandrite from India at Alexandrite discussion forums | Alexandrite guide: Alexandrite from India at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2006-11-28 18:15:29; /discussion/post/-alexandrite-from-india-FRM-168-00003
23. I was told this was an alexandrite when given to me. at Alexandrite discussion forums | Alexandrite guide: I was told this was an alexandrite when given to me. at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2011-06-09 02:01:22; /discussion/topic/i-was-told-this-was-an-alexandrite-when-given-to-m-FRM-424
24. In need of Help Identifying... at Alexandrite discussion forums | Alexandrite guide: In need of Help Identifying... at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2011-06-06 03:29:28; /discussion/topic/in-need-of-help-identifying-FRM-422
25. In need of Help Identifying... at Alexandrite discussion forums | Alexandrite guide: In need of Help Identifying... at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2011-06-06 03:31:34; /discussion/topic/in-need-of-help-identifying-FRM-423
26. 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; /chapters/faq/why-does-alexandrite-appear-to-change-color-in-sunlight-and-artificial-light.html
27. 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; /chapters/glossary/young-helmholtz-theory-of-color-vision.html
28. Hue: The characteristic color that is determined by its wavelength as red, green, blue, purple, yellow, etc., and excludes white, black, and shades of gray in reference to the visible spectrum of light.; HTML, 24 Kb, 2008-07-20 13:04:47; /chapters/glossary/hue.html
29. Spinel: An isomorphous mineral of spinel group. A wide range of colors and shade of gemstone. Red-orange is named as flame spinel, an iron-rich dark-green to black, which is known as green spinel, pleonaste or ceylonite, grass-green as chlorospinel (iron-rich), b; HTML, 26 Kb, 2008-07-20 13:06:56; /chapters/glossary/spinel.html
30. How can I spot the difference between a natural and a synthetic alexandrite?: HTML, 26 Kb, 2008-07-29 08:11:26; /chapters/faq/how-can-i-spot-the-difference-between-a-natural-and-a-synthetic-alexandrite.html

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