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1. 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
2. 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
3. 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
4. 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
5. What gemstones change color like alexandrite? at Alexandrite discussion forums | Alexandrite guide: What gemstones change color like alexandrite? at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2007-03-16 00:59:00; /discussion/topic/what-gemstones-change-color-like-alexandrite-FRM-282
6. 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
7. Top Blue Green Alexandrite Oval 2.15cts.: Extremely rare Alexandrite (Chrysoberyl) Oval 2.15cts from India (Deobhog area); HTML, 15 Kb, -0001-11-30 00:00:00; /gemstones/natural-alexandrite-oval-2-15-faceted_xax328aa
8. 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
9. Strong Color Change Alexandrite Oval: Rare Alexandrite (Chrysoberyl) Oval 1.05cts from India (Deobhog area); HTML, 15 Kb, -0001-11-30 00:00:00; /gemstones/natural-alexandrite-oval-1-05-faceted_yax503aa
10. 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
11. Re: In need of Help Identifying... at Alexandrite discussion forums | Alexandrite guide: Re: In need of Help Identifying... at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2011-06-19 07:20:06; /discussion/post/re-in-need-of-help-identifying-FRM-423-00001
12. Natural Alexandrite Ring at Alexandrite discussion forums | Alexandrite guide: Natural Alexandrite Ring at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2009-09-16 05:59:23; /discussion/post/natural-alexandrite-ring-FRM-171-00003
13. 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
14. 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
15. 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
16. 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
17. 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
18. 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
19. Glossary of Terms for Alexandrite Gemstone Buyer and Collector's Guide: Glossary of terms that have been discussed or mentioned at Alexandrite gemstone buyer and collectors guide; HTML, 38 Kb, 2008-07-20 13:02:49; /chapters/glossary/index.html
20. 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
21. Chrysoberyl Species and Variety: Information about the chrysoberyl mineral, it's properties, varieties and history; HTML, 65 Kb, 2008-07-20 13:01:25; /chapters/chapter3/index.html
22. Chrysoberyl Classification and Properties: A comprehensive guide to the chrysoberyl family and it's varieties, including alexandrite and cymophane gemstones; HTML, 49 Kb, 2008-07-20 13:01:30; /chapters/chapter4/index.html
23. Certified Strong Color Change Alexandrite: Extremely rare Alexandrite (Chrysoberyl) Oval 3.06cts from Asia (Andhra Pradesh); HTML, 15 Kb, -0001-11-30 00:00:00; /gemstones/natural-alexandrite-oval-3-06-faceted_yax588aa
24. Certified Strong Change Alexandrite 21.23cts: Extremely rare Alexandrite (Chrysoberyl) Cushion 21.23cts from Tanzania (Tunduru); HTML, 15 Kb, -0001-11-30 00:00:00; /gemstones/natural-alexandrite-cushion-21-23-faceted_AX1161aa
25. Certified Natural Alexandrite Oval 2.04cts: Extremely rare Alexandrite (Chrysoberyl) Oval 2.04cts from India (Deobhog area); HTML, 16 Kb, -0001-11-30 00:00:00; /gemstones/natural-alexandrite-oval-2-04-faceted_yax391aa
26. Certified Natural Alexandrite Oval 1.01cts.: Rare Alexandrite (Chrysoberyl) Oval 1.01cts from India (Deobhog area); HTML, 15 Kb, -0001-11-30 00:00:00; /gemstones/natural-alexandrite-oval-1-01-faceted_yax361aa
27. Certified Natural 7.0mm Alexandrite 2.16cts.: Extremely rare Alexandrite (Chrysoberyl) Round 2.16cts from India (Deobhog area); HTML, 15 Kb, -0001-11-30 00:00:00; /gemstones/natural-alexandrite-round-2-16-faceted_yax409aa
28. Certified Fine Natural Alexandrite 1.41cts.: Rare Alexandrite (Chrysoberyl) Oval 1.41cts from India (Deobhog area); HTML, 15 Kb, -0001-11-30 00:00:00; /gemstones/natural-alexandrite-oval-1-41-faceted_yax434aa
29. 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
30. Alexandrite Synthetics and Imitations: Guide to synthetic alexandrite production, alexandrite imitations and the differences between natural and synthetic alexandrite; HTML, 60 Kb, 2008-07-20 13:01:43; /chapters/chapter7/index.html
31. Alexandrite Frequently Asked Questions: Answers to frequently asked questions about alexandrite gemstone identification and value.; HTML, 46 Kb, 2008-07-20 12:02:11; /chapters/faq/index.html
32. Alexandrite engagement ring at Alexandrite discussion forums | Alexandrite guide: Alexandrite engagement ring at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2007-11-18 03:07:00; /discussion/post/alexandrite-engagement-ring-FRM-176-00001
33. Alexandrite Buyer's Guide: Comprehensive guide for buying and evaluating alexandrite gemstones; HTML, 77 Kb, 2008-07-20 13:02:02; /chapters/chapter9/index.html
34. 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
35. 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

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