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6 bytes added ,  22:54, January 26, 2008
Evolutionary bias
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[[Image:Emeralds.jpg‎ |right|thumb|300px|]] Emeralds are one of the 4 "[[precious stone]]s", a valued gemstone most often having a clear dark green color. The emerald is a variety of the [[mineral]] beryl which derives its color from [[chromium]] and vanadium. It has a hardness rating of 7.5, and Specific Gravity of: 2.65 to 2.76. These gems are often used in jewelry. Emeralds have long been mined in [[Egypt]], and are also found in [[Pakistan]] and [[Colombia]]. In the United States, emeralds have been found in [[North Carolina]]. Emerald is the [[birthstone]] for May.
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[[Image:Emeralds.jpg‎ |right|thumb|300px|]] '''Emeralds''' are one of the 4 "[[precious stone]]s", a valued gemstone most often having a clear dark green color. The emerald is a variety of the [[mineral]] beryl which derives its color from [[chromium]] and vanadium. It has a hardness rating of 7.5, and Specific Gravity of: 2.65 to 2.76. These gems are often used in jewelry. Emeralds have long been mined in [[Egypt]], and are also found in [[Pakistan]] and [[Colombia]]. In the United States, emeralds have been found in [[North Carolina]]. Emerald is the [[birthstone]] for May.
     
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