alexandrite natural of photo stone

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201. Is alexandrite the most expensive gemstone in the world?: Along with diamonds, rubies, and emeralds, top quality alexandrites are among the most expensive gemstones in the world. In larger sizes over 4.00 or 5.00cts., Burmese rubies are more rare and expensive than alexandrites but in sizes below 1.00cts., alexa; HTML, 26 Kb, 2008-07-29 08:11:10; /chapters/faq/is-alexandrite-the-most-expensive-gemstone-in-the-world.html
202. How much will a typical one carat alexandrite gemstone cost?: The retail replacement cost for a 1ct. alexandrite could be anywhere between $500 to $12,000 per carat. The intensity of the color change and the attractiveness of the colors are the most important factors in determining the value of an alexandrite. With; HTML, 25 Kb, 2008-07-29 08:11:03; /chapters/faq/how-much-will-a-typical-one-carat-alexandrite-gemstone-cost.html
203. 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
204. 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
205. 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
206. What causes the cat's-eye effect in chrysoberyl?: The cat's-eye effect is caused by the reflection of light off of minute, parallel, needle-like rutile crystals or hollow tubes within the stone. Cat's eye inclusions are aligned parallel to the crystallographic axis and the stones are always cut as caboch; HTML, 25 Kb, 2008-07-29 08:10:30; /chapters/faq/what-causes-the-cat-s-eye-effect-in-chrysoberyl.html
207. What is the difference between cat's eye and alexandrite?: Cat's eye is the popular name for an optical effect known as chatoyancy in the gemological nomenclature. Microscopic needle-like inclusions inside the stone reflect a streak of light that appears to open and close as the stone is rotated -- hence the eye; HTML, 26 Kb, 2008-07-29 08:10:22; /chapters/faq/what-is-the-difference-between-cat-s-eye-and-alexandrite.html
208. 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
209. 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
210. 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
211. A Bibliography of Alexandrite Gemstone Buyer and Collector's Guide: An annotated bibliography of Alexandrite Gemstone Buyer and Collector's Guide; HTML, 59 Kb, 2008-07-20 13:08:19; /chapters/bibliography.html
212. 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
213. 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
214. 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
215. 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
216. 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
217. 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
218. 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
219. 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
220. 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

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Alexandrite

alexandrite natural of photo stone

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