Inflation is the rate at which the general level of prices for goods and services is rising and, consequently, the purchasing power of currency is falling. Central banks attempt to limit inflation, and avoid deflation, in order to keep the economy running smoothly. Next Up.
If you are not allergic to metal, the reason for this reaction is chemical. It's due to a combination of the metal and the acids in your skin. Experts say that there are several metals that oxidize with your skin to give you a noticeable green ring around your finger. A ring made of copper is a common culprit, but even silver and gold metals can cause discoloration.
Some Emeralds are light green or even have a tinge of yellow. Emeralds are made from beryl and include the rare element beryllium. While beryl is a common form of mineral, emeralds are usually very rare. The two trace elements that give an Emerald its beautiful green are chromium and vanadium.