alexandrite natural of photo stone

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1. Zoning: The straight, parallel growth-lines in the internal structure of a gemstone with definite angles, usually seen in some stones, which occur by slightly variation in the chemical composition within the crystal due to separation or interruptions of the cryst; HTML, 24 Kb, 2008-07-20 13:08:17; /chapters/glossary/zoning.html
2. Zone of crystal faces: In crystallography a characteristic feature of a serie faces of a crystal where those intersection lines with each other are all parallel.; HTML, 23 Kb, 2008-07-20 13:08:16; /chapters/glossary/zone-of-crystal-faces.html
3. Zone axis: A line runs through the center of a crystal, to which all faces of a given zone are parallel.; HTML, 23 Kb, 2008-07-20 13:08:13; /chapters/glossary/zone-axis.html
4. Zone: A group of crystal faced intersection, which are parallel to a common line.; HTML, 23 Kb, 2008-07-20 13:08:12; /chapters/glossary/zone.html
5. Zonary growth: Zonary growing of crystals bounded by plane crystal faces, which occur by slight variation in the composition of a crystal due to separation or interruptions of the crystal phases during growth.; HTML, 24 Kb, 2008-07-20 13:08:10; /chapters/glossary/zonary-growth.html
6. Zimbabwean alexandrite, Girdlestone Farm: Information about Zimbabwean alexandrite findings and mining in Girdlestone Farm, Zimbabwe.; HTML, 28 Kb, 2008-07-31 07:35:54; /localities/alexandrite-locality-zimbabwe-masvingo-girdlestone-farm.html
7. Zimbabwe at Alexandrite discussion forums | Alexandrite guide: Zimbabwe at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2007-04-30 10:24:42; /discussion/topic/zimbabwe-FRM-163
8. Zenhokyo: Leading gemmological educational institution in Japan has been providing professional education in the field for the past 30 years. Zenhokyo Laboratory is equipped with the most professional and advanced testing devices and systems, including inductive; HTML, 65 Kb, 2009-03-15 02:29:48; /directory/laboratories/zenhokyo-wdd-003-00012.html
9. Zandrite at Alexandrite discussion forums | Alexandrite guide: Zandrite at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2009-03-28 06:22:00; /discussion/post/zandrite-FRM-324-00001
10. Yttrium: A dark gray, silvery luster, rare earth metallic element of the Periodic System with the symbol Y. Flammable when powder from. Used in alloys and as a metal deoxidizer.; HTML, 23 Kb, 2008-07-20 13:08:06; /chapters/glossary/yttrium.html
11. 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
12. Yellow chrysoberyl: Yellow greenish to light yellow or brown chrysoberyl, which contains ferric iron as an impurity. Has an absorption spectrum band at first part of the violet at 444 nm, which can be seen in some chrysoberyl cat's-eye.; HTML, 24 Kb, 2008-07-20 13:08:02; /chapters/glossary/yellow-chrysoberyl.html
13. Yehuda treatment: A colorless glass-like material used as an impregnation or filling agent to improve the appearance and reduce the visibility of inclusions in stones such as diamonds and emeralds.; HTML, 24 Kb, 2008-07-20 13:08:01; /chapters/glossary/yehuda-treatment.html
14. Y-axis: One of the 3 optic axes and intermediate axis in biaxial crystal.; HTML, 23 Kb, 2008-07-20 13:07:59; /chapters/glossary/y-axis.html
15. X-ray spectrum: Several characteristic lines of the spectrum of X-ray, which are emitted by a bombardment of material with electrons such as curved dark lines on the films produced by X-ray method of powder diffraction of stone or minerals.; HTML, 24 Kb, 2008-07-20 13:07:55; /chapters/glossary/x-ray-spectrum.html
16. X-ray fluorescence: If a crystal is irradiated by an intense X-ray or gamma-ray beam, this includes the substance to emit its visible characteristic secondary X-ray line spectra of a longer wavelength, which is known as X-ray fluorescence. It is a nondestructive method. Used; HTML, 24 Kb, 2008-07-20 13:07:53; /chapters/glossary/x-ray-fluorescence.html
17. X-ray filters: To generate monochromatic X-rays or line spectrums only one wavelength used is a suitable selective filter made of very thin layers of metal elements. There have one or two atomic numbers lower than the target metal such as nickel with atomic number 28 us; HTML, 24 Kb, 2008-07-20 13:07:52; /chapters/glossary/x-ray-filters.html
18. X-ray crystal spectrometer: A device to obtain an X-ray spectrum for determining the wavelength of its chemical consistent. Each element, when irradiated by electrons, emits X-ray of several characteristic frequencies the line spectrum depending on the atomic number.; HTML, 24 Kb, 2008-07-20 13:07:50; /chapters/glossary/x-ray-crystal-spectrometer.html
19. X-ray: The produced wavelengths of X-rays according to the electromagnetic theory of light consisting of continuous band of wavelengths, which are a mixture of all wavelengths. Depends on the used voltage of apparatus, which is know as white X-ray radiation or g; HTML, 24 Kb, 2008-07-20 13:07:48; /chapters/glossary/x-ray.html
20. Why is natural alexandrite better than synthetic alexandrite?: Natural alexandrite is not better than synthetic alexandrite but natural alexandrite is very rare and uncommon in modern jewelry because it is hardly ever available and because it is too expensive for the general public to buy. Even lower quality more inc; HTML, 26 Kb, 2008-07-29 08:11:15; /chapters/faq/why-is-natural-alexandrite-better-than-synthetic-alexandrite.html
21. 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
22. Why do you love alexandrite? at Alexandrite discussion forums | Alexandrite guide: Why do you love alexandrite? at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2009-10-08 17:41:37; /discussion/topic/why-do-you-love-alexandrite-FRM-353
23. Where do the best alexandrite gemstones come from?: Although Russian alexandrites have the most historical value, fine stones are occasionally available from deposits in Brazil, India, Tanzania, Madagascar, and Sri Lanka. Unfortunately, there has been little production of alexandrites from any deposit in r; HTML, 26 Kb, 2008-07-29 08:11:44; /chapters/faq/where-do-the-best-alexandrite-gemstones-come-from.html
24. Where can I test and appraise my alexandrite?: The most well known gemological laboratories are listed below and all of them are equipped to test alexandrite. Most gemological laboratories only identify gemstones, they do not appraise them.; HTML, 28 Kb, 2008-07-29 08:12:19; /chapters/faq/where-can-i-test-and-appraise-my-alexandrite.html
25. Where can I buy natural alexandrite gemstones?: Fine alexandrites or alexandrite jewelry can be purchased from jewelers specializing in colored gemstones, at trade shows, from TV sellers, at high end jewelry auctions, or online from websites specialized in alexandrite. You would be unlikely to find a h; HTML, 25 Kb, 2008-07-29 08:12:01; /chapters/faq/where-can-i-buy-natural-alexandrite-gemstones.html
26. What's the difference between a Valuation and Appraisal? at Alexandrite discussion forums | Alexandrite guide: What's the difference between a Valuation and Appraisal? at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2009-03-15 03:12:00; /discussion/post/what-s-the-difference-between-a-valuation-and-appraisal-FRM-280-00001
27. What makes natural alexandrite so expensive?: Alexandrite is an expensive gemstone because it so rare and production has always been limited. For years, the only source for alexandrite was Russia. In the last 20 or 30 years several new discoveries of alexandrite have been reported but production of s; HTML, 25 Kb, 2008-07-29 08:10:06; /chapters/faq/what-makes-natural-alexandrite-so-expensive.html
28. What is the june gemstone? at Alexandrite discussion forums | Alexandrite guide: What is the june gemstone? at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2009-04-02 15:18:00; /discussion/topic/what-is-the-june-gemstone-FRM-337
29. What is the difference between chrysoberyl and alexandrite? at Alexandrite discussion forums | Alexandrite guide: What is the difference between chrysoberyl and alexandrite? at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2009-03-19 22:15:42; /discussion/topic/what-is-the-difference-between-chrysoberyl-and-ale-FRM-302
30. 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

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Alexandrite

alexandrite natural of photo stone