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.
In the big book of product failures, there are a few examples that stand out as so colossal you have to wonder what the company was thinking. Still, others seem to have just been a case of bad timing, bad marketing and bad luck. Below we'll look at six reasons why products fail, and the products that prove it. Timing In some cases, a luxury product that's been in planning stages for years is set to launch just as a major recession is starting. This was the case with the Ford Edsel.