Highly valued as gemstones, emeralds are a grass-green variety of beryl. The capacity of emeralds to deflect light and to break white light into its component colors is not high, so cut stones display little brilliancy or fire (flashes of color). The color that gives this gem its value comes from the presence of small amounts of chromium. The most important production of fine-quality gem material is Colombia; emeralds are also mined in Russia, Australia, South Africa, and Zimbabwe. Synthetic emeralds are identical to natural crystals and may rival them in color and beauty.
1 One of the primary reasons why BMI is a flawed measurement tool is that it uses weight as a measure of risk, when it is actually a high percentage of body fat that makes a person obese.  Many experts are now leaning toward body fat percentage as the most accurate measure of obesity.
Technology blog Blu-ray security at risk as Intel master key leaks to web. Chip maker confirms that code posted to web is authentic and begins investigation, but says it would only be useful embedded in chips. Published: 17 Sep 2010. Blu-ray security at risk as Intel master key leaks to web.