gemstones

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201. 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
202. 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
203. Multicolour Gems: HTML, 63 Kb, 2009-03-06 16:25:54; /directory/gemstone-dealers/multicolour-gems-wdd-003-00001.html
204. Lapidary: A craftsman who cuts, polishes, and engraves colored gemstones, other than diamonds. A worker who cuts, and polishes diamonds is known as a diamond cutter.; HTML, 23 Kb, 2008-07-20 13:05:29; /chapters/glossary/lapidary.html
205. Luminescence: The emission of certain visible wavelengths of light from a substance other than thermal process, which are used as diagnostic determination of gemstones. It is caused by the emission of photons, when an exited atom within the substance returns to the gro; HTML, 25 Kb, 2008-07-20 13:05:35; /chapters/glossary/luminescence.html
206. Is there a difference between Russian and Brazilian Alexandrite gemstones? at Alexandrite discussion forums | Alexandrite guide: Is there a difference between Russian and Brazilian Alexandrite gemstones? at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2009-03-19 22:26:42; /discussion/topic/is-there-a-difference-between-russian-and-brazilia-FRM-303
207. 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
208. Re: Help with web design at Alexandrite discussion forums | Alexandrite guide: Re: Help with web design at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2007-01-10 02:21:55; /discussion/post/-re-help-with-web-design-FRM-157-00001
209. Alexandrite Gemstone Collectors Guide, Alexandrite gemstones gallery and Alexandrite mining information at Alexandrite discussion forums | Alexandrite guide: Alexandrite Gemstone Collectors Guide, Alexandrite gemstones gallery and Alexandrite mining information at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2007-01-18 07:20:33; /discussion/topic/alexandrite-gemstone-collectors-guide-alexandrite--FRM-158
210. Carat: A unit employed in weighing diamonds, pearls, and other gemstones, which formerly ranged from 185.5 to 205.3 milligrams. Now the International metric carat is equal to 0.2 gram, or 200 milligrams and this is the standard in a majority of countries. Abbrev; HTML, 25 Kb, 2008-07-20 13:03:29; /chapters/glossary/carat.html
211. Translucent: Gemstone transmits light but no object can be seen clearly through it such as moonstone. Translucent gemstones are not suitable for brilliant cutting but cut cabochon.; HTML, 23 Kb, 2008-07-20 13:07:07; /chapters/glossary/translucent.html
212. Alexandrite Forum Rules at Alexandrite discussion forums | Alexandrite guide: Alexandrite Forum Rules at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2006-09-02 18:16:22; /discussion/topic/alexandrite-forum-rules-FRM-153
213. Is alexandrite the most expensive gemstone in the world? at Alexandrite discussion forums | Alexandrite guide: Is alexandrite the most expensive gemstone in the world? at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2013-01-22 19:50:31; /discussion/post/is-alexandrite-the-most-expensive-gemstone-in-the-world-FRM-458-00001
214. Synthetic: Artificially made substance that has the same appearance, physical properties and chemical compound as its natural counterpart mineral. Some synthetic stones have no counterpart in nature they are synthetic gemstones except if they used as an imitation fo; HTML, 25 Kb, 2008-07-20 13:06:58; /chapters/glossary/synthetic.html
215. Spectrum: Any array of electromagnetic visible light ordered according to its constituent wavelengths or colors, when the white light is dispersed by a prism or diffraction grating, ranging from about 750 to about 400 nm. The spectra can obtained by means of spectr; HTML, 27 Kb, 2008-07-20 13:06:54; /chapters/glossary/spectrum.html
216. 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
217. Colburn Earth Science Museum: HTML, 63 Kb, 2009-03-30 12:02:20; /directory/museums/colburn-earth-science-museum-wdd-003-00040.html
218. The Weinman Mineral Gallery: The museum features four main galleries: The Weinman Mineral Gallery, The Fossil Gallery, Science in Motion and The Collins Family My Big Backyard. A 120-seat digital planetarium and an observatory with a state-of-the-art 20-inch telescope will also be lo; HTML, 63 Kb, 2009-03-30 11:53:52; /directory/museums/the-weinman-mineral-gallery-wdd-003-00039.html
219. Spectroscope: A small hand optical device for obtaining and visually observing spectrum, in which collimated light passes through a narrow slit onto either a prism or diffraction grating, its spectrum being viewed by a lens system or telescope. The angle between the c; HTML, 24 Kb, 2008-07-20 13:06:53; /chapters/glossary/spectroscope.html
220. Physical properties: Physical properties of gemstones are extremely important in understanding geological phenomena in synthesizing new materials, and identification of minerals. Physical properties and chemical composition of minerals change with temperature and pressure. P; HTML, 24 Kb, 2008-07-20 13:06:22; /chapters/glossary/physical-properties.html
221. Jewel: A fashioned ornament for personal adornment, which is made of noble metals mounted with natural, synthetic, or imitation gemstones.; HTML, 23 Kb, 2008-07-20 13:05:05; /chapters/glossary/jewel.html
222. 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

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