gemstones

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51.: David Wein is an online fine jewelry store in association with Multicolour.com, the world´s most eclectic favourite online gemstone retailer. David Wein brings together an exquisite range of fine jewelry at exceptional value. Visitors will find an e; HTML, 63 Kb, 2009-03-15 00:14:55; /directory/jewelers/david-wein-wdd-003-00006.html
52. Alexandrite Questions, Answers and a Quick Reference: The quick reference to how to select, buy and enjoy alexandrite gemstones and jewelry; HTML, 30 Kb, 2009-03-14 17:33:16; /alexandrite.html
53. Multicolour Gems: HTML, 63 Kb, 2009-03-06 16:25:54; /directory/gemstone-dealers/multicolour-gems-wdd-003-00001.html
54. Colour change sapphire anyone? at Alexandrite discussion forums | Alexandrite guide: Colour change sapphire anyone? at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2008-10-26 13:01:00; /discussion/post/colour-change-sapphire-anyone-FRM-282-00005
55. Red color change garnet at Alexandrite discussion forums | Alexandrite guide: Red color change garnet at Alexandrite discussion forums | Alexandrite guide; HTML, 25 Kb, 2008-09-16 02:21:00; /discussion/post/red-color-change-garnet-FRM-282-00003
56. Tanzanian alexandrite, Tunduru: Information about Tanzanian alexandrite findings and mining in Tunduru, Tanzania.; HTML, 29 Kb, 2008-07-31 07:35:25; /localities/alexandrite-locality-tanzania-tunduru.html
57. Ceylon alexandrite, Horana: Information about Ceylon alexandrite findings and mining in Horana, Sri Lanka.; HTML, 29 Kb, 2008-07-31 07:35:14; /localities/alexandrite-locality-sri-lanka-western-province-horana.html
58. Russian Alexandrite, Malyshevskoye: Information about Russian alexandrite findings and mining in Malyshevskoye, Russia.; HTML, 29 Kb, 2008-07-31 07:34:54; /localities/alexandrite-locality-russia-malyshevskoye-deposit.html
59. Brazilian alexandrite, Teafilo Otoni: Information about Brazilian alexandrite findings and mining in Novo Cruzeiro, Brazil.; HTML, 30 Kb, 2008-07-31 07:34:05; /localities/alexandrite-locality-brazil-minas-gerais-teofilo-otoni.html
60. Brazilian alexandrite, Hematita: Information about Brazilian alexandrite findings and mining in Hematita, Brazil.; HTML, 29 Kb, 2008-07-31 07:33:47; /localities/alexandrite-locality-brazil-minas-gerais-hematita.html
61. Alexandrite World Occurrences and Mining Localities: Directory of confirmed findings and current mining localities of alexandrite, cat´s eye and chrysoberyl gemstones; HTML, 34 Kb, 2008-07-31 07:32:37; /localities/index.html
62. What do I need to check before purchasing alexandrite gemstone?: First and foremost, we need to look at the quality and strength of the color change. A strong change where the colors are bright and attractive under any kind of light is most desirable. Many stones are either a beautiful green in daylight or a nice pinki; HTML, 26 Kb, 2008-07-29 08:12:28; /chapters/faq/what-do-i-need-to-check-before-purchasing-alexandrite-gemstone.html
63. 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
64. 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
65. What is the best way to clean and take care of alexandrites?: With a hardness of 8.5, Alexandrite is a tough, hard, and durable gemstone that doesn't require any special attention. Still, even the hardest gemstones can shatter with a single well-placed blow so caution is always a good idea. Washing dishes with your; HTML, 25 Kb, 2008-07-29 08:11:53; /chapters/faq/what-is-the-best-way-to-clean-and-take-care-of-alexandrites.html
66. 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
67. 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
68. 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
69. 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
70. 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
71. 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
72. 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
73. Weight of gemstones and precious metals: A standard mass. The unit of weight of gemstones since 1913, is the international metric carat or decimally of them in points.; HTML, 23 Kb, 2008-07-20 13:07:44; /chapters/glossary/weight-of-gemstones-and-precious-metals.html
74. Vanadium: A very hard, light-gray, ductile, malleable, metallic element of the group V of the Periodic System with the symbol V. It is one of the 8 pigment metals responsible for color in gemstones such as beryl, sapphire (natural or synthetic). Used as a component; HTML, 24 Kb, 2008-07-20 13:07:28; /chapters/glossary/vanadium.html
75. Ultrasonic cleaning: A device for cleaning dirt and other foreign particles from gemstones and jewelry articles by subjecting them to ultrasonic vibrations immersed in water or other solvent. The articles must be free of stress flaws. Glass lenses and other bodies can be poli; HTML, 24 Kb, 2008-07-20 13:07:17; /chapters/glossary/ultrasonic-cleaning.html
76. 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
77. 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
78. 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
79. 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
80. 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
81. Phenomenon: A special optical occurrence, or circumstance observed or are visible in certain gemstones such as chatoyancy, asterism, or play of color, adularescence, girasol, labradorescence, opalescence, schiller, etc.; HTML, 24 Kb, 2008-07-20 13:06:20; /chapters/glossary/phenomenon.html
82. Pegmatite: A light-colored, coarse-grained igneous rock from granite clan containing orthoclase, quartz, microline, mica, gemstones, and many ferromagnesian minerals resulting from slow solidification. Pegmatite is occurring place of many uncommon gem minerals such; HTML, 24 Kb, 2008-07-20 13:06:14; /chapters/glossary/pegmatite.html
83. Needlelike (silk): Acicular a needle form of inclusions in gemstones.; HTML, 23 Kb, 2008-07-20 13:05:56; /chapters/glossary/needlelike-silk.html
84. 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
85. 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
86. 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
87. Imitation: To result something of a genuine article or natural gemstone or simulate it from any material that imitate by its color, the appearance of a natural gemstone. Imitation gemstone having wholly different physical properties and chemical composition, and hen; HTML, 25 Kb, 2008-07-20 13:04:51; /chapters/glossary/imitation.html
88. Hardness: The quality of resistance or property of minerals, gemstones, etc., which is determined by reference to an empirical scale of standard of minerals. Hardness is the resistance of a mineral offered to abrasion or scratching (scelerometric). The absolute har; HTML, 25 Kb, 2008-07-20 13:04:40; /chapters/glossary/hardness.html
89. Gemstone cuts: Any forms or styles used in the fashioning of gemstones such as antique cut, brilliant cut, emerald cut, baguette, cabochon, rose cut, etc.; HTML, 23 Kb, 2008-07-20 13:04:32; /chapters/glossary/gemstone-cuts.html
90. Gemstone: Any rough mineral or other material natural or synthetic, which possesses the necessary attractiveness, brilliance, beauty, rarity, color dispersion, refraction, color or colorless, flawless, portability, fashionably, and durability for use in gem industr; HTML, 25 Kb, 2008-07-20 13:04:30; /chapters/glossary/gemstone.html
91. Flux-fusion method: This is a technique used to make certain synthetic gemstones such as emerald, ruby, spinel, quartz, Alexandrite, YAG, etc., man-made crystals growing in a high melting solvent or flux. The material or composition of desired synthetic crystal (beryllium an; HTML, 24 Kb, 2008-07-20 13:04:23; /chapters/glossary/flux-fusion-method.html
92. Color change: There are four major methods of changing the colors of gemstones. These are surface painting or foiling the back, oiling, coating, impregnating, staining of porous stones, heat treatment, and irradiation by particles of atomic size and X-rays. The color c; HTML, 26 Kb, 2008-07-20 13:03:40; /chapters/glossary/color-change.html
93. Clarity grading: The classification of fashioned gemstones or diamonds according to their clarity using the standard nomenclature of terms: flawless, pure, clean, perfect (for top grade). VVS (very very slightly included), VS (very slightly included), SI (slightly include; HTML, 24 Kb, 2008-07-20 13:03:38; /chapters/glossary/clarity-grading.html
94. Chatoyancy: An optical effect, possessed by certain translucent gemstones in reflecting light, in which a movable, wavy or silky sheen is concentrated in a narrow band of white light that changes its position, when the gem is turned. This is a characterized of cat's; HTML, 26 Kb, 2008-07-20 13:03:30; /chapters/glossary/chatoyancy.html
95. 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
96. Alexandrite: Named after Russian Tsar Alexander II. A highly dichroic, rare variety of chrysoberyl. Emerald green in natural daylight, reddish in violet by artificial light, due to its unusual absorption properties. One of the hardest and most important gemstones. A f; HTML, 25 Kb, 2008-07-20 13:02:54; /chapters/glossary/alexandrite.html
97. 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
98. 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
99. Alexandrite Myths, Legends and Lore: Collection of myths, legends and lore surrounding the alexandrite gemstone; HTML, 50 Kb, 2008-07-20 13:01:57; /chapters/chapter8/index.html
100. Synthetic gemstone growth techniques: Information about melt, solution growth and vapour deposition techniques used for synthetic gemstones manufacturing; HTML, 38 Kb, 2008-07-20 13:01:50; /chapters/chapter7/synthetic-gemstone-growth-techniques.html

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