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21. 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
22. Is there a difference between Russian and Brazilian Alexandrite gemstones?: The mining of alexandrite in Russia lasted less than 100 years from the time it was discovered in 1833 to the early 1900’s. It was George Kunz, the gemologist/gemstone buyer for Tiffany & Co that probably did the most to popularize this unique gemst; HTML, 27 Kb, 2008-07-29 08:09:57; /chapters/faq/is-there-a-difference-between-russian-and-brazilian-alexandrite-gemstones.html
23. 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; /chapters/faq/what-is-the-difference-between-chrysoberyl-and-alexandrite.html
24. Are there any other gemstones which change color?: Several other well known gemstones, including diaspore, sapphire, garnet and spinel may also change color as a function of the light source but the color change of top alexandrites is distinctive and attractive under any light conditions.; HTML, 26 Kb, 2008-07-29 08:10:37; /chapters/faq/are-there-any-other-gemstones-which-change-color.html
25. 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
26. 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; /chapters/faq/what-are-the-most-common-colors-of-alexandrite.html
27. 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
28. Very modern, sleek Alexandrite ring at Alexandrite discussion forums | Alexandrite guide: Very modern, sleek Alexandrite ring at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2009-03-19 22:47:00; /discussion/post/very-modern-sleek-alexandrite-ring-FRM-287-00002
29. Alexandrite - Malacacheta at Alexandrite discussion forums | Alexandrite guide: Alexandrite - Malacacheta at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2009-04-01 11:40:00; /discussion/post/alexandrite-malacacheta-FRM-335-00001
30. Color change garnet vs Alexandrite at Alexandrite discussion forums | Alexandrite guide: Color change garnet vs Alexandrite at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2009-04-05 00:40:00; /discussion/post/color-change-garnet-vs-alexandrite-FRM-341-00002

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