Guest guest Posted August 17, 2009 Report Share Posted August 17, 2009 Looking for local information? Find it on Local Emerald, the green variety of the mineral beryl, is the most famous and favored green gemstone. Its beautiful green color, combined with durability and rarity, make it one of the most valuable gemstones. Beryl also contains other, lesser known gem varieties, such as aquamarine and heliodor. Pure beryl is white; emerald's green color is caused by chromium impurities (and occasionally by vanadium impurities). Deep green is the most desired color in emeralds. The paler the color of the emerald, the lesser its value. Pale emeralds are not called emeralds, but " green beryl " . They are sometimes heat-treated, in which they become aquamarine. Emeralds are notorious for their flaws. Flawless stones are very uncommon, and are noted for their great value. Some people actually prefer an emerald with very minute flaws over a flawless emerald, as this proves authenticity of the stone. Many emerald flaws can be hidden by treating the emeralds with oil. Newer, more effective fracture-filling techniques are also practiced. Irradiation of some emerald gems is somewhat effective in removing certain flaws. A rare, prized form of emerald, found only in the Muzo mining district of Colombia, is a very unusual form of this gem. This emerald, known as " Trapiche emerald " is characterized by star-shaped rays that emanate from its center in a hexagonal pattern. These rays appear much like asterism, but, unlike asterism, they are not caused by light reflection from tiny parallel inclusions, but by black carbon impurities that happen to form in the same pattern. Emerald may develop internal cracks if banged hard or if subject to extreme temperature change. Emeralds that were treated to mask internal flaws should never be cleaned with an ultrasonic jewelry cleaner, nor should they be washed with soap. These practices will remove the oil and expose the hidden internal flaws. Warm regards, Mr. Gaurav Aggarwal M/S Shreshtha Enterprises http://www.shreshthyantra.com New Delhi (INDIA) Ph- +91-9650178678 To Get More Mythological And Astrological Updates Join shreshthyantra : Shreshthyantra : Astro_Remedial Group Quote Link to comment Share on other sites More sharing options...
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